WO2019189223A1 - Appareil ophtalmique - Google Patents

Appareil ophtalmique Download PDF

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Publication number
WO2019189223A1
WO2019189223A1 PCT/JP2019/012942 JP2019012942W WO2019189223A1 WO 2019189223 A1 WO2019189223 A1 WO 2019189223A1 JP 2019012942 W JP2019012942 W JP 2019012942W WO 2019189223 A1 WO2019189223 A1 WO 2019189223A1
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WIPO (PCT)
Prior art keywords
lens
scanning
eye
lens group
examined
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PCT/JP2019/012942
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English (en)
Japanese (ja)
Inventor
ゴンザーロ ムヨ
アリスター ゴーマン
デイビット エム ウィリアムソン
誠 藤本
泰史 西
Original Assignee
株式会社ニコン
オプトス ピーエルシー
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Application filed by 株式会社ニコン, オプトス ピーエルシー filed Critical 株式会社ニコン
Publication of WO2019189223A1 publication Critical patent/WO2019189223A1/fr

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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B3/00—Apparatus for testing the eyes; Instruments for examining the eyes
    • A61B3/10—Objective types, i.e. instruments for examining the eyes independent of the patients' perceptions or reactions

Definitions

  • the technology of the present disclosure relates to an ophthalmologic apparatus.
  • Patent Document 1 Patent Document 2, and Patent Document 3 disclose an apparatus for photographing an eye to be examined using a scanning laser ophthalmoscope and an optical coherence tomography.
  • SLO scanning laser opthalmoscope
  • OCT optical coherence tomography
  • the first aspect of the technology of the present disclosure is as follows.
  • a first scanning unit configured to emit a first scanning light beam at a first maximum scanning angle;
  • a common lens group configured to form an SLO system, wherein the first scanning unit and the pupil of the eye to be examined have a first conjugate relationship, and the first scanning light beam is transmitted through the common lens group;
  • a first optical system configured to emit to the eye to be examined;
  • a second scanning unit configured to emit a second scanning light beam and having a second maximum scanning angle smaller than the first maximum scanning angle of the first scanning unit;
  • the common lens group is configured to form an OCT system, the second scanning unit and the pupil of the eye to be examined have a second conjugate relationship, and the second scanning light beam is transmitted to the common lens group.
  • a second optical system configured to emit through the eye to be examined,
  • the optical path of the first optical system and the optical path of the second optical system are combined, and are disposed between the first scanning unit and the common lens group, and similarly, the second scanning unit and the A combining unit disposed between the common lens group and
  • the second aspect of the technology of the present disclosure is as follows: A first scanning unit configured to emit a first scanning light beam at a first maximum scanning angle; A common lens group configured to form an SLO system, wherein the first scanning unit and the pupil of the eye to be examined have a first conjugate relationship, and the first scanning light beam is transmitted through the common lens group; A first optical system configured to emit to the eye to be examined; A second scanning unit configured to emit a second scanning light beam and having a second maximum scanning angle smaller than the first maximum scanning angle of the first scanning unit; The common lens group is configured to form an OCT system, the second scanning unit and the pupil of the eye to be examined have a second conjugate relationship, and the second scanning light beam is transmitted to the common lens group.
  • a second optical system configured to emit through the eye to be examined,
  • the optical path of the first optical system and the optical path of the second optical system are combined, and are disposed between the first scanning unit and the common lens group, and similarly, the second scanning unit and the A combining unit disposed between the common lens group and
  • a paraxial lateral magnification of the first optical system from the first scanning unit to the eye to be examined is ⁇ 1, (2)
  • the paraxial lateral magnification of the second optical system from the second scanning unit to the eye to be examined is ⁇ 2,
  • a third aspect of the technology of the present disclosure is as follows.
  • a first scanning unit configured to scan the first scanning light beam at a first scanning speed;
  • a common lens group configured to form an SLO system, wherein the first scanning unit and the pupil of the eye to be examined have a first conjugate relationship, and the first scanning light beam is transmitted through the common lens group;
  • a first optical system configured to emit to the eye to be examined;
  • a second scanning unit configured to scan a second scanning light beam different from the first scanning light beam at a second scanning speed lower than the first scanning speed of the first scanning unit;
  • the common lens group is configured to form an OCT system, the second scanning unit and the pupil of the eye to be examined have a second conjugate relationship, and the second scanning light beam is transmitted to the common lens group.
  • a second optical system configured to emit through the eye to be examined,
  • the optical path of the first optical system and the optical path of the second optical system are combined, and are disposed between the first scanning unit and the common lens group, and similarly, the second scanning unit and the A combining unit disposed between the common lens group and
  • the fourth aspect of the technology of the present disclosure is: A first scanning unit configured to emit a first scanning light beam in a first scanning angle range;
  • the SLO system is configured to have a common lens group, the first scanning unit and the pupil of the eye to be examined have a first conjugate relationship, and the first scanning light beam is passed through the common lens group.
  • a first optical system configured to emit to the eye to be examined at an external illumination angle ⁇ 1 of 1;
  • a second scanning unit configured to emit a second scanning light beam in a second scanning angle range smaller than the first scanning angle range;
  • the common lens group is configured to form an OCT system, the second scanning unit and the pupil of the eye to be examined have a second conjugate relationship, and the second scanning light beam is transmitted to the common lens group.
  • a second optical system configured to emit to the eye to be examined at a second external illumination angle ⁇ 2 via
  • the schematic block diagram which shows an example of the whole structure of an ophthalmologic apparatus.
  • the conceptual diagram which shows an example of a schematic structure of the wide angle optical system contained in an ophthalmologic apparatus.
  • the block diagram which shows an example of the composite-type objective lens system for SLO and OCT as a wide angle optical system.
  • the figure for demonstrating angular magnification The figure for demonstrating angular magnification.
  • the conceptual diagram which shows the structure of the modification of a composite type objective lens system.
  • the conceptual diagram which shows the structure of the other modification of a composite type objective lens system.
  • the figure which shows the example of the relationship of (omega) out of an objective lens system, and Pmax / Pmin. 1 is a diagram illustrating a configuration of an objective lens system according to Example 1-1.
  • FIG. 3 is a diagram illustrating a relationship between ⁇ out and M of the objective lens system according to Example 1-1.
  • FIG. 6 is a diagram illustrating a relationship between ⁇ out and Pmax / Pmin of the objective lens system according to Example 1-1.
  • FIG. 3 is a diagram illustrating a configuration of an objective lens system according to Example 1-2.
  • FIG. 6 is a diagram illustrating a relationship between ⁇ out and M of the objective lens system according to Example 1-2.
  • FIG. 6 is a diagram illustrating a relationship between ⁇ out and Pmax / Pmin of the objective lens system according to Example 1-2.
  • FIG. 3 is a diagram illustrating a configuration of an objective lens system according to Example 2-1.
  • FIG. 6 is a diagram illustrating a relationship between ⁇ out and M of the objective lens system according to Example 2-1.
  • FIG. 6 is a diagram illustrating a relationship between ⁇ out and Pmax / Pmin of the objective lens system according to Example 2-1.
  • FIG. 6 is a diagram illustrating a configuration of an objective lens system according to Example 2-2.
  • FIG. 6 is a diagram illustrating a relationship between ⁇ out and M of the objective lens system according to Example 2-2.
  • FIG. 10 is a diagram illustrating a relationship between ⁇ out and Pmax / Pmin of the objective lens system according to Example 2-2.
  • FIG. 6 is a diagram illustrating a configuration of an objective lens system according to Example 3-1.
  • FIG. 6 is a diagram illustrating a relationship between ⁇ out and M of the objective lens system according to Example 3-1.
  • FIG. 10 is a diagram illustrating a relationship between ⁇ out and Pmax / Pmin of the objective lens system of Example 3-1.
  • FIG. 4 is a diagram illustrating a configuration of an objective lens system according to Example 3-2.
  • FIG. 6 is a diagram illustrating a relationship between ⁇ out and M of the objective lens system according to Example 3-2.
  • FIG. 6 is a diagram illustrating a relationship between ⁇ out and Pmax / Pmin of the objective lens system according to Example 3-2.
  • FIG. 4 is a diagram illustrating a configuration of an objective lens system according to Example 4-1.
  • FIG. 10 is a diagram illustrating a relationship between ⁇ out and M of the objective lens system according to Example 4-1.
  • FIG. 10 is a diagram illustrating a relationship between ⁇ out and Pmax / Pmin of the objective lens system according to Example 4-1.
  • FIG. 6 shows a configuration of an objective lens system of Example 5-1.
  • FIG. 6 shows a configuration of an objective lens system in Example 6-1.
  • FIG. 7 shows a configuration of an objective lens system in Example 7-1.
  • FIG. 8 shows a configuration of an objective lens system of Example 8-1.
  • FIG. 10 shows a configuration of an objective lens system of Example 9-1.
  • FIG. 10 shows a configuration of an objective lens system of Example 10-1.
  • FIG. 11 shows a configuration of an objective lens system of Example 11-1.
  • Sectional drawing which shows the structure of another embodiment of an imaging optical system.
  • photography optical system. 6 is a flowchart showing the operation of the image processing apparatus.
  • the ophthalmologic apparatus 110 includes an imaging device 14 and a control device 16.
  • the imaging device 14 includes an SLO unit 18 and an OCT unit 20 and acquires a fundus image of the fundus of the eye 12 to be examined.
  • an image acquired by the SLO unit 18 is referred to as an SLO image.
  • An image acquired by the OCT unit 20 is referred to as an OCT image.
  • the control device 16 is realized by a computer having a CPU (Central Processing Unit) 16A, a RAM (Random Access Memory) 16B, a ROM (Read-Only memory) 16C, and an input / output (I / O) port 16D.
  • CPU Central Processing Unit
  • RAM Random Access Memory
  • ROM Read-Only memory
  • the control device 16 includes an input / display device 16E connected to the CPU 16A via the I / O port 16D.
  • the input / display device 16E has a graphic user interface that displays an image of the eye 12 to be examined and receives various instructions from the user.
  • An example of a graphic user interface is a touch panel display.
  • control device 16 includes an image processing device 17 connected to the I / O port 16D.
  • the image processing device 17 generates an image of the eye 12 to be examined based on the data obtained by the imaging device 14.
  • control device 16 may be configured to be connected to a network via a communication interface (not shown).
  • the imaging device 14 operates under the control of the control device 16.
  • the imaging device 14 includes an SLO unit 18, an imaging optical system 19, and an OCT unit 20.
  • the photographing optical system 19 includes a first optical scanner 22, a second optical scanner 24, and a wide-angle optical system 30.
  • the wide-angle optical system 30 includes an objective lens system (not shown in FIG. 1) having a common lens group 28, and a combining unit 26.
  • the first optical scanner 22 two-dimensionally scans the light emitted from the SLO unit 18 in the X direction and the Y direction.
  • the second optical scanner 24 two-dimensionally scans the light emitted from the OCT unit 20 in the X direction and the Y direction.
  • the first optical scanner 22 and the second optical scanner 24 may be any optical element that can deflect a light beam.
  • a polygon mirror, a galvanometer mirror, or the like can be used. Moreover, those combinations may be sufficient.
  • the horizontal direction is “X direction”
  • the vertical direction to the horizontal plane is “Y direction”
  • the direction perpendicular to both the X direction and the Y direction is “Z direction”.
  • the photographing optical system 19 includes a wide-angle optical system 30.
  • the wide-angle optical system 30 realizes observation with a wide FOV (Field of View) 12A in the fundus.
  • the FOV 12A indicates a range that can be captured by the imaging device 14.
  • the FOV 12A can be expressed as a viewing angle.
  • the viewing angle can be defined by the internal irradiation angle and the external irradiation angle.
  • the external irradiation angle is an irradiation angle that defines the irradiation angle of the light beam irradiated from the ophthalmologic apparatus 110 to the subject eye 12 with the pupil 27 as a reference.
  • the internal irradiation angle is an irradiation angle that defines the irradiation angle of the light beam applied to the fundus with reference to the center O of the eyeball.
  • the external irradiation angle and the internal irradiation angle have a correspondence relationship. For example, when the external irradiation angle is 120 degrees, the internal irradiation angle corresponds to about 160 degrees.
  • the SLO system is realized by a control device 16, an SLO unit 18, and a photographing optical system 19, as shown in FIG. Since the SLO system includes the wide-angle optical system 30, fundus photography can be performed with a wide FOV 12 ⁇ / b> A.
  • the SLO unit 18 includes a light source 18A, a detection element 18B, and a beam splitter 18C.
  • the detection element 18B is an example of a light receiving unit according to the technique of the present disclosure.
  • the light emitted from the light source 18A passes through the beam splitter 18C and enters the photographing optical system 19.
  • the light incident on the photographing optical system 19 is scanned in the X direction and the Y direction by the first optical scanner 22.
  • Scanning light is applied to the fundus via the wide-angle optical system 30 and the pupil 27.
  • the reflected light reflected by the fundus enters the SLO unit 18 via the wide-angle optical system 30 and the first optical scanner 22.
  • the reflected light incident on the SLO unit is reflected by the beam splitter 18C and received by the detection element 18B.
  • the image processing device 17 generates an SLO image based on the signal detected by the detection element 18B.
  • the OCT system is realized by a control device 16, an OCT unit 20, and an imaging optical system 19, as shown in FIG. Since the OCT system includes the wide-angle optical system 30, fundus imaging can be performed with a wide FOV 12A.
  • the OCT unit 20 includes a light source 20A, a detection element 20B, an optical coupler 20C, an optical coupler 20F, a reference optical system 20D, and a collimating lens 20E.
  • the detection element 20B is an example of a light receiving unit according to the technique of the present disclosure.
  • the light emitted from the light source 20A is branched by the optical coupler 20C. One of the branched lights is converted into parallel light by the collimator lens 20E as measurement light and then incident on the photographing optical system 19.
  • the measurement light is scanned in the X direction and the Y direction by the second optical scanner 24. Scanning light is applied to the fundus via the wide-angle optical system 30 and the pupil 27. Measurement light reflected by the fundus enters the OCT unit 20 via the wide-angle optical system 30 and the second optical scanner 24. The other light branched by the optical coupler 20C enters the reference optical system 20D as reference light. The reference light and the measurement light reflected from the fundus interfere with the optical coupler 20F to generate interference light. The interference light is received by the detection element 20B. The image processing device 17 generates an OCT image based on the signal detected by the detection element 20B.
  • the OCT method may be SD-OCT (Spectral-Domain OCT) or SS-OCT (Swept-Source OCT).
  • the configuration of the wide-angle optical system 30 included in the photographing optical system 19 will be described with reference to FIG.
  • the light emitted from the SLO unit 18 and incident on the photographing optical system 19 is referred to as “SLO light”
  • the light emitted from the OCT unit 20 and incident on the photographing optical system 19 is referred to as “OCT light”.
  • the SLO light and the OCT light incident on the photographing optical system 19 are configured to be substantially parallel light.
  • FIG. 2 is a conceptual diagram showing an example of a schematic configuration of the photographing optical system 19.
  • the SLO objective lens system 31 used for acquiring the SLO image and the OCT objective lens system 32 used for acquiring the OCT image are combined by the combining unit 26. It has a configuration.
  • Each of the SLO objective lens system 31 and the OCT objective lens system 32 is an example of an ophthalmic optical system according to the technology of the present disclosure, and is an example of an ophthalmic objective lens according to the technology of the present disclosure. It is an example of the objective lens which concerns on.
  • the SLO objective lens system 31 includes a first lens group G1 and a third lens group G3.
  • the OCT objective lens system 32 includes a second lens group G2 and a third lens group G3.
  • the first lens group G1 is an SLO dedicated lens group.
  • the second lens group G2 is an OCT dedicated lens group.
  • the third lens group G3 is an example of the common lens group 28 shown in FIG.
  • the SLO objective lens system 31 has an optical path that passes through the combining unit 26, and the combining unit 26 is disposed between the first lens group G1 and the third lens group G3.
  • the combining unit 26 is located in the optical path between the second lens group G2 and the third lens group G3.
  • the OCT objective lens system 32 has a bent optical path in which the optical path is bent by the combining unit 26. Have. That is, the SLO objective lens system 31 and the OCT objective lens system 32 have the third lens group G3 as a common lens group 28 on the eye side to be examined from the synthesis unit 26.
  • SLO light and OCT light have different wavelengths
  • a dichroic mirror having wavelength dependency is used as the combining unit 26.
  • the combining unit 26 in FIG. 2 has a function of combining the optical path of SLO light toward the eye to be examined and the optical path of OCT toward the eye to be examined. Further, for the light reflected by the eye 12 to which the light irradiated on the eye 12 is reflected, the synthesizer 26 separates the optical path of the reflected light based on the SLO light and the optical path of the reflected light based on the OCT light. It also has a function of guiding reflected light based on light to the first lens group G1 and guiding reflected light based on OCT light to the second lens group G2.
  • the SLO objective lens system 31 and the OCT objective lens system 32 share the same lens group on the eye side by using an element having photosynthesis and light separation functions such as a dichroic mirror.
  • an element having photosynthesis and light separation functions such as a dichroic mirror.
  • the SLO light light having one wavelength of visible light or light having several wavelengths of visible light can be used.
  • three types of light having a wavelength of 450 nm, a wavelength of 520 nm, and a wavelength of 638 nm are used as SLO light, and a color SLO image can be obtained.
  • the OCT light infrared light having a wavelength of 800 to 1000 nm can be used.
  • the chromatic aberration generated in the third lens group G3 on the eye side to be examined from the synthesis unit 26 is corrected according to the wavelength of the SLO light in the first lens group G1, and the second lens In the group G2, the SLO objective lens system 31 and the OCT objective lens system 32 are configured to perform correction according to the wavelength of the OCT light.
  • the SLO objective lens system 31 is an afocal optical system, and the position of the first optical scanner 22 (the position of the scanning center of the first optical scanner 22) and the pupil position of the eye 12 to be examined are conjugated. It is configured.
  • the OCT objective lens system 32 is also an afocal optical system so that the position of the second optical scanner 24 (the position of the scanning center of the second optical scanner 24) and the pupil position of the eye 12 to be examined are conjugated. It is configured.
  • the “conjugate relationship” is not limited to a complete conjugate relationship, and means a conjugate relationship including an error that is allowed in advance as an error in manufacturing, an error accompanying a change with time, and the like.
  • the “afocal optical system” is not limited to a complete afocal optical system, and includes an afocal optical system including errors allowed in advance as errors in manufacturing, errors due to changes over time, and the like. Means.
  • the operation of the photographing optical system 19 having the above configuration will be described. First, operations related to SLO shooting will be described.
  • the parallel SLO light incident on the photographing optical system 19 from the SLO unit 18 is angularly scanned by a first optical scanner 22 such as a polygon mirror.
  • the angle-scanned parallel light SLO light is sequentially transmitted through the first lens group G1, the combining unit 26, and the third lens group G3, and is projected on the pupil plane of the eye 12 to be inspected as parallel light at a predetermined magnification.
  • Angular scanning is performed with the pupil of the eye 12 to be scanned as the scanning center.
  • the parallel light is collected by the eye 12 to be examined, and a condensing spot of SLO light scans the fundus as irradiation light on the fundus of the eye 12 to be examined.
  • the reflected light obtained by reflecting the irradiation light on the fundus passes through the pupil of the eye 12 to be examined, and is sequentially transmitted through the third lens group G3, the synthesis unit 26, and the first lens group G1, and then the first optical scanner 22. Then, the light enters the SLO unit 18.
  • the operation after the reflected light is incident on the SLO unit 18 is as described with reference to FIG.
  • the parallel OCT light incident on the photographing optical system 19 from the OCT unit 20 is angularly scanned by a second optical scanner 24 such as a galvano mirror.
  • the angle-scanned parallel OCT light is transmitted through the second lens group G2, reflected by the combining unit 26, then transmitted through the third lens group G3, and remains on the pupil plane of the eye 12 as parallel light. Projected at a predetermined magnification, angle scanning is performed with the pupil of the eye 12 to be scanned as the scanning center.
  • the parallel light is collected by the eye 12 to be examined, and the condensing spot of the OCT light scans the fundus (retinal plane) and the inside of the retina as irradiation light on the fundus of the eye 12 to be examined.
  • the reflected light obtained by reflecting the OCT light on the fundus or retina passes through the pupil of the eye 12 to be examined, passes through the third lens group G3, is reflected by the combining unit 26, and passes through the second lens group G2.
  • the light passes through the second optical scanner 24 and enters the OCT unit 20.
  • the operation after the reflected light is incident on the OCT unit 20 is as described with reference to FIG.
  • the OCT objective lens system 32 is also an afocal system, similar to the SLO objective lens system 31, but the beam diameter of the irradiation light is used for obtaining cross-sectional information of the fundus of the eye 12 to be examined. It is relatively large and needs to be accurately condensed on the observation surface. Accordingly, it is necessary to appropriately converge or diverge the parallel light flux according to the change in the distance to the observation surface and the diopter of the eye 12 to be examined. However, even in this case, the objective lens system is based on the afocal system.
  • FIG. 3 shows an example of a specific configuration of the first lens group G1, the second lens group G2, and the third lens group G3.
  • the first lens group G1 includes a meniscus lens component (a lens L11 and a lens having a convex surface directed toward the first optical scanner 22 in order from the first optical scanner 22 side toward the eye to be examined).
  • a negative lens L13 having a concave surface on the first optical scanner 22 side
  • a positive lens L14 having a convex surface on the eye side to be examined
  • a positive lens L15 a positive lens L15.
  • the absolute value of the radius of curvature of the lens surface on the first optical scanner 22 side is smaller than the absolute value of the radius of curvature of the lens surface on the eye side to be examined.
  • the absolute value of the curvature radius of the lens surface on the eye side to be examined is smaller than the absolute value of the curvature radius of the lens surface on the first optical scanner 22 side.
  • the “lens component” means a lens having two contact interfaces with air on the optical axis, and one lens component means one single lens or a plurality of lenses. It means a set of cemented lenses constructed by being cemented.
  • the meniscus-shaped lens component of the first lens group G1 is effective for correcting chromatic aberration when a cemented lens is used as shown in the figure, but is a single lens when the wavelength range of light used is relatively narrow. be able to.
  • the second lens group G2 includes a meniscus lens component (junction between the lens L21 and the lens L22) having a convex surface toward the second optical scanner 24 in order from the second optical scanner 24 to the eye to be examined.
  • Lens a meniscus lens component (junction between the lens L21 and the lens L22) having a convex surface toward the second optical scanner 24 in order from the second optical scanner 24 to the eye to be examined.
  • Lens a negative lens L23 having a concave surface facing the second optical scanner 24, a positive lens L24 having a convex surface facing the eye to be examined, and a positive lens L25.
  • the absolute value of the radius of curvature of the lens surface on the second optical scanner 24 side is smaller than the absolute value of the radius of curvature of the lens surface on the eye side to be examined.
  • the absolute value of the curvature radius of the lens surface on the eye side to be examined is smaller than the absolute value of the curvature radius of the lens surface on the second optical scanner 24 side.
  • the meniscus-shaped lens component of the second lens group G2 is effective for correcting chromatic aberration when a cemented lens is used as shown in the figure, but is a single lens when the wavelength range of light used is relatively narrow. be able to.
  • the third lens group G3 is a common lens group 28 that is provided between the synthesizing unit 26 and the eye 12 and is used in common for SLO and OCT.
  • the third lens group G3 includes a positive lens L31 having a convex surface directed toward the eye to be examined, a positive lens L32 having a convex surface directed toward the eye to be examined, and a negative lens L33 in order from the synthesis unit 26 side toward the eye to be examined. And a positive lens L34 having a convex surface facing the eye to be examined and a positive meniscus lens L36 having a concave surface facing the eye to be examined.
  • the third lens group G3 in this example includes two cemented lenses, but may be configured to include only one cemented lens according to the state of chromatic aberration correction.
  • the paraxial angular magnification of the SLO objective lens system 31 and the OCT objective lens system 32 is suitably set.
  • the paraxial angular magnification will be described with reference to FIGS. 4 and 5.
  • FIG. 4 and 5 illustrate an afocal optical system 40 having k surfaces. 4 and 5, the left side of the figure is the object side, and the right side is the image side.
  • the parallel light beam incident on the afocal optical system 40 is emitted as a parallel light beam after passing through the afocal optical system 40.
  • the angle formed between the incident parallel light beam and the optical axis AX on the object side of the afocal optical system 40 (referred to as an incident angle ⁇ ), and the angle formed by the emitted parallel light beam on the image side of the afocal optical system 40 with the optical axis AX.
  • incident angle ⁇ k the angle formed between the incident parallel light beam and the optical axis AX on the object side of the afocal optical system 40
  • it is different from the emission angle ⁇ k.
  • an arbitrary paraxial light beam emitted from an on-axis object point at a distance s1 from the first surface 401 of the afocal optical system 40 including k surfaces to the object side is converted into an afocal optical system.
  • the optical axis intersects with the image side from the final k-th surface 40 k to sk ′.
  • the height at which the paraxial ray intersects the first surface 401 and the kth surface 40k is h1 and hk, respectively, and the angles formed with the optical axis on the object side and the image side are u1 and uk ′, respectively.
  • Let y1 and yk ′ denote the sizes of the images to be processed.
  • the refractive index of the medium before and after the afocal optical system is 1.
  • u1 ⁇ y1 uk ' ⁇ yk'
  • u1 h1 / s1
  • uk ′ hk / sk ′
  • h1 ⁇ (y1 / s1) hk ⁇ (yk ′ / sk ′)
  • Mpar is defined as follows.
  • Mpar ⁇ k / ⁇ (h1 / hk) s1 ⁇ ⁇ Mpar is an angular magnification in the paraxial region, that is, a paraxial angular magnification.
  • a paraxial ray parallel to the optical axis is incident on the afocal optical system
  • the paraxial ray is parallel to the optical axis even after passing through the afocal optical system.
  • the paraxial angle magnification of the afocal optical system is obtained.
  • the paraxial angle magnification Mpar is a constant of the optical system that is unrelated to the incident angle ⁇ .
  • M1 is the paraxial angular magnification of the optical system that conjugates the first optical scanner 22 and the pupil of the eye 12 to be examined
  • M2 is conjugate relation between the second optical scanner 24 and the pupil of the eye 12 to be examined.
  • the paraxial angle magnification of the optical system That is, in the configuration shown in FIG. 2, M1 is the paraxial angle magnification of the SLO objective lens system 31 from the first optical scanner 22 to the eye 12 to be examined, and M2 is for OCT from the second optical scanner 24 to the eye 12 to be examined.
  • the paraxial angular magnification of the objective lens system 32 is used, the following conditional expression (1) is satisfied.
  • Such a configuration enables SLO imaging in an ultra-wide field of view (hereinafter referred to as UWF) and OCT imaging in all areas with an ultra-high angle of view.
  • UWF ultra-wide field of view
  • OCT imaging in all areas with an ultra-high angle of view.
  • a wide range image as large as the entire imageable region 12A of the eye 12 to be examined is captured by SLO imaging by high-speed scanning with SLO light in 0.5 seconds or less, and then OCT.
  • Information on the cross-sectional shape is obtained by photographing a narrow range such as a lesion by OCT imaging using light.
  • a high scanning speed is required for at least one of the X-direction scanning and the Y-direction scanning of the first optical scanner 22 for SLO imaging.
  • the second optical scanner 24 for OCT imaging scanning is so fast. Speed is not required. Therefore, specifically, for example, a polygon mirror is used for at least one of X-direction scanning and Y-direction scanning of the first optical scanner 22 for SLO imaging, and a galvano mirror is used for the second optical scanner 24 for OCT imaging. Is practical.
  • the maximum scanning angle at which SLO light can be scanned in the scanning direction using a polygon mirror as the first optical scanner 22 for SLO is ⁇ 1
  • the maximum scanning angle at which the second optical scanner 24 can scan OCT light is ⁇ 2
  • the maximum scanning angle ⁇ 2 of the second optical scanner 24 for OCT is smaller than the maximum scanning angle ⁇ 1 of the first optical scanner 22 for SLO, and ⁇ 2 ⁇ 1. That is, the scanning angle range of the second optical scanner 24 is smaller than the scanning angle range of the first optical scanner 22.
  • the range of the paraxial angular magnification M1 of the SLO objective lens system 31 is preferably set so as to satisfy the following conditional expression (2).
  • the range of the paraxial angle magnification M2 of the OCT objective lens system 32 is preferably set so as to satisfy the following conditional expression (3). 1.5 ⁇
  • the configuration satisfying conditional expressions (2) and (3) is effective when the external illumination angle is wider than 100 degrees.
  • the configuration satisfying conditional expressions (2) and (3) requires an internal irradiation angle of about 180 degrees or more by super-wide-angle light beam scanning called UWF in which the external irradiation angle is wider than 120 degrees. It is even more effective when
  • the paraxial lateral magnification of the SLO objective lens system 31 from the first optical scanner 22 to the eye 12 to be examined is ⁇ 1, and the second optical scanner.
  • the paraxial lateral magnification of the OCT objective lens system 32 from 24 to the eye 12 to be examined is ⁇ 2, the following conditional expression (4) is satisfied.
  • ⁇ 1 is the paraxial lateral magnification of the objective lens system 31 for SLO when the scanning center of the first optical scanner 22 is an object point and the pupil position of the eye 12 is an image point.
  • ⁇ 2 is a paraxial lateral magnification of the OCT objective lens system 32 when the scanning center of the second optical scanner 24 is an object point and the pupil position of the eye 12 is an image point.
  • the paraxial lateral magnification can be considered as a ratio between the diameter of the incident light beam and the diameter of the emitted light beam when a parallel light beam parallel to the optical axis enters the objective lens system and exits.
  • the diameter of the incident light beam for SLO light is ⁇ in (SLO)
  • the diameter of the emitted light beam is ⁇ out (SLO).
  • the change in the beam diameter by the objective lens system when a parallel beam parallel to the optical axis is incident on the objective lens system is that the OCT objective lens system 32 is SLO objective lens system 31 from the conditional expression (4). It turns out that it is comprised so that it may become smaller.
  • the range of ⁇ 1 is preferably set so as to satisfy the following conditional expression (5). Moreover, it is preferable to set the range of ⁇ 2 so as to satisfy the following conditional expression (6). 0.25 ⁇
  • the configuration satisfying conditional expressions (5) and (6) is effective when the external illumination angle is wider than 100 degrees. Further, the configuration satisfying conditional expressions (5) and (6) requires an internal irradiation angle of about 180 degrees or more by super-wide-angle light beam scanning called UWF in which the external irradiation angle is wider than 120 degrees. It is even more effective when For conditional expression (5), it is more preferable to set the lower limit to 0.28 and the upper limit to 0.67.
  • the scanning speed at which the second optical scanner 24 scans the OCT light is configured to be slower than the scanning speed at which the first optical scanner 22 scans the SLO light.
  • the scanning speed here means a scanning time per unit area.
  • the maximum scanning angle of the first optical scanner 22 for SLO is determined by the fundus imaging region.
  • OCT imaging a limited partial area that requires cross-sectional measurement is scanned, but the entire super-wide-angle fundus area similar to SLO imaging can be measured for each partial area. It is preferable that the maximum scanning angle of the second optical scanner 24 for OCT is configured in the relationship of the above conditional expression.
  • the photographing optical system 19 in which the scanning speed is set as described above is also configured to satisfy the conditional expression (1). Further, it is preferable to set so as to satisfy at least one of conditional expressions (2) and (3). Similarly, it is preferable that the photographing optical system 19 in which the scanning speed is set as described above is configured so as to satisfy the conditional expression (4). Further, it is preferable to set so as to satisfy at least one of conditional expressions (5) and (6).
  • the configurations according to the conditional expressions (2), (3), (5), and (6) are not limited to the case where the wide-angle optical system 30 has a composite objective lens system of SLO and OCT. This is also effective when the objective lens system 31 and the OCT objective lens system 32 are individually configured. Therefore, as a UWF objective lens, it is preferable that the paraxial angle magnification is larger than 1.5 and more practically larger than 1.8 according to the conditions shown in the conditional expressions (2) and (3). Is advantageous.
  • the third lens group G3 as the common lens group 28 is a conjugate function between the pupil of the eye 12 to be scanned and the scanner, which is a basic function as an SLO objective lens and an OCT objective lens.
  • the pupil aberration due to the substantially afocal system that forms the lens is mainly corrected.
  • the first lens group G1 realizes the above-described magnification relationship and chromatic aberration correction functions necessary for the SLO objective lens system 31 in combination with the third lens group G3.
  • the second lens group G2 realizes the above-described magnification relationship and the function of correcting chromatic aberration necessary for the OCT objective lens system 32, in combination with the third lens group G3.
  • Such a lens configuration is suitable as an ultra-wide-angle objective lens system with an external illumination angle exceeding 120 degrees, but when the field angle is smaller, each lens configuration can be made a simpler lens configuration. Needless to say.
  • both the SLO objective lens system 31 and the OCT objective lens system 32 have a lens group on the scanner side (that is, the light source side) from the synthesis unit 26, but the common lens group 28 is designed as appropriate. Accordingly, it is possible to adopt a configuration in which either one of the SLO objective lens system 31 and the OCT objective lens system 32 does not have a lens group on the light source side, that is, on the scanner side from the synthesis unit 26.
  • FIGS. 6A and 6B are conceptual diagrams of a first modification and a second modification of the composite objective lens system, respectively.
  • the third lens group G3-1 corresponds to the common lens group 28
  • the SLO objective lens system 31 includes only the third lens group G3-1
  • the OCT objective lens system 32 includes the first lens group G3-1.
  • the second lens group G2-1 and the third lens group G3-1 are included.
  • the third lens group G3-1 is subjected to aberration correction in the visible light region for SLO.
  • the second lens group G2-1 in the OCT objective lens system 32 has a lens configuration for correcting aberrations in the infrared region for OCT in the synthesis system with the third lens group G3-1. Basically, it is preferable to adopt a configuration having a negative refractive power. Also in this modification, in view of the above-described circumstances, the maximum scanning angle ⁇ 2 of the second optical scanner 24 for OCT is smaller than the maximum scanning angle ⁇ 1 of the first optical scanner 22 for SLO, ⁇ 2 ⁇ 1.
  • the third lens group G3-2 corresponds to the common lens group 28, and the SLO objective lens system 31 includes the first lens group G1-1 and the third lens group G3-2.
  • the objective lens system 32 is composed only of the third lens group G3-2. In this configuration, the third lens group G3-2 is subjected to aberration correction in the infrared light region for OCT.
  • the first lens group G1-1 in the SLO objective lens system 31 has a lens configuration for correcting aberrations in the visible light region for SLO in the synthesis system with the third lens group G3-2. Basically, a configuration having a positive refractive power is preferable. Also in this modification, in view of the above-described circumstances, the maximum scanning angle ⁇ 2 of the second optical scanner 24 for OCT is smaller than the maximum scanning angle ⁇ 1 of the first optical scanner 22 for SLO, ⁇ 2 ⁇ 1.
  • the shape of the optical path in FIGS. 2, 6A and 6B is an example.
  • a configuration in which the optical path of the SLO objective lens system 31 is bent and the optical path of the OCT objective lens system 32 is linear is possible by setting the wavelength characteristics of the combining unit 26 as appropriate.
  • each of the SLO objective lens system 31 and the OCT objective lens system 32 is suitably designed for angular distribution of angular magnification.
  • the angular distribution of angular magnification will be described.
  • FIG. 7 shows a diagram of an objective lens system 300 as an example.
  • the objective lens system 300 is a refractive optical system including eleven lenses L1 to L11.
  • the objective lens system 300 is basically an afocal optical system.
  • FIG. 7 also shows the scanning center position Ps where one reflecting surface of the scanner is located and the pupil plane Pp of the eye 12 to be examined.
  • the scanning center position Ps of the scanner and the position of the pupil plane Pp are configured to be optically conjugate with each other by the objective lens system 300.
  • the light beam incident on the objective lens system 300 from the scanner is substantially parallel light.
  • FIG. 7 shows a state of a light beam having the maximum field angle scanned by the scanner and passing through the objective lens system 300 and entering the pupil plane Pp.
  • the angle formed between the incident light 44i incident on the objective lens system 300 from the scanner side and the optical axis AX of the objective lens system 300 is ⁇ in, and the exit is emitted from the objective lens system 300 toward the eye to be examined.
  • Conditional expression (7) means that M for the light beam with the maximum field angle is larger than the angular magnification in the paraxial region.
  • conditional expression (7) it becomes easy to have an aberration structure in which the angular distribution of angular magnification becomes larger as the emission angle of the peripheral ray increases.
  • the maximum scanning angle by the scanner can be made larger, and it becomes easy to obtain a larger external illumination angle as the objective lens system.
  • the viewing angle at the fundus can be set to an angle at which a wide fundus region from the center of the fundus to the fundus can be observed.
  • 1.1 ⁇ Mpar ⁇ Mmax (8) ⁇ out is the angle of light rays that enter the eye 12 to be examined from the objective lens system 300.
  • the conditional expression (8) is satisfied, the angle ⁇ out of the light beam that enters the eye 12 to be examined from the objective lens system 300 can be efficiently expanded, and a large external illumination angle can be easily obtained.
  • conditional expression (9) Mmax ⁇ 2 ⁇ Mpar (9)
  • conditional expression (9) it becomes easy to configure so that the difference between the resolution of the ophthalmic apparatus when ⁇ in is small and the resolution of the ophthalmic apparatus when ⁇ in is maximum is within the allowable range.
  • conditional expression (8) and conditional expression (9) simultaneously.
  • conditional expressions (10) and (11) it is also preferable to satisfy the following conditional expressions (10) and (11). 1 ⁇ Mpar (10) 1 ⁇ Mmax (11)
  • conditional expressions (10) and (11) it becomes easy to obtain a large external irradiation angle. Further, regarding Mmax, it is more preferable that the following conditional expression (11A) is satisfied.
  • conditional expression (11A) it is more preferable to set the lower limit value to 2.5 and the upper limit value to 3. 2 ⁇ Mmax ⁇ 5 (11A)
  • M is M in the central portion including the intersection with the optical axis AX of the eye 12 and M in the peripheral portion of the eye 12 to be examined.
  • conditional expression (7A) is preferably satisfied.
  • Mc ⁇ Mp (7A) Mpar and Mc are approximate values.
  • Mmax and Mp have the same value.
  • FIG. 8 illustrates the relationship between ⁇ in and ⁇ out of the objective lens system according to an example of this embodiment with a solid line.
  • the horizontal axis of the graph of FIG. 8 is ⁇ in, and the vertical axis is ⁇ out.
  • a galvanometer mirror or a polygon mirror is used as a scanner.
  • M which is the ratio of ⁇ in and ⁇ out
  • M is not constant.
  • the relationship between ⁇ in and ⁇ out for a comparative example in which M has a constant value at all angles of view is indicated by a broken line.
  • the value of M in the comparative example is a straight line, in one example of the present embodiment, the emission angle ⁇ out increases rapidly as the incident angle ⁇ in increases.
  • the graph of FIG. 9 illustrates the relationship between ⁇ out and M of the objective lens system according to an example of the present embodiment.
  • the horizontal axis in FIG. 9 is ⁇ out, and the vertical axis is M.
  • the examples shown in FIGS. 8 and 9 satisfy the conditional expressions (7) to (11).
  • this example has a range between Mpar and Mmax in which M increases as ⁇ in increases. It is more preferable that M increases as ⁇ in increases in the entire range from Mpar to Mmax.
  • the angular distribution of angular magnification as described above is not limited to the objective lens system illustrated in FIG. 7, but is suitable for an objective lens system that maintains an external irradiation angle of about 100 degrees or more.
  • the UWF objective lens preferably has a paraxial angular magnification greater than 1.5, and further relates to the paraxial angular magnification Mp. It is preferable that the conditional expression 1.5 ⁇ Mpar ⁇ 5.0 is satisfied.
  • the lower limit value of the paraxial angular magnification is advantageously larger than 1.8.
  • the upper limit value is smaller than 4.0 in order not to make the scanning angle of the scanning means as UWF too large.
  • the diameter of the light beam irradiated on the pupil plane of the eye 12 to be examined by the wide-angle optical system 30 will be considered.
  • the light beam diameter is at a position equal to or less than a desired value on the pupil plane of the eye 12 to be examined even if the scanning angle ⁇ in is changed. If the luminous flux diameter exceeds a desired value, there arises a problem that it does not enter the pupil of the eye 12 to be examined.
  • the peripheral light beam that is, the light beam having a large ⁇ in, passes through the periphery of the lens of the objective lens system 300, so that the influence of the aberration of the objective lens system 300 is likely to appear, and fluctuates in the meridional direction on the pupil of the eye 12 to be examined. Cause wobbling.
  • the maximum value of the angle formed between the emitted light beam emitted from the objective lens system 300 to the subject eye 12 and the optical axis AX of the objective lens system 300 is ⁇ max, and the emitted light beam and the optical axis AX are formed.
  • the diameter of the luminous flux in the meridional direction at the position of the pupil plane Pp of the eye 12 when the angle is ⁇ max is Pmax, and the pupil plane Pp of the eye 12 when the angle between the outgoing light beam and the optical axis AX is minimum.
  • the beam diameter in the meridional direction of the emitted light beam at the position is Pmin, the following conditional expression (12) is satisfied.
  • FIG. 10 shows a conceptual diagram of a light beam that is emitted from the reflecting surface 22A of the scanner and passes through the objective lens system 300 and enters the pupil plane Pp.
  • the YZ plane is shown
  • the direction of the optical axis AX is the Z direction
  • the scanning direction by the scanner reflection surface 22A is the Y direction. That is, in the configuration shown in FIG. 10, the meridional direction is the Y direction.
  • the light beam when the angle between the outgoing light beam and the optical axis AX is the maximum angle ⁇ max is indicated by a broken line
  • the light beam when the angle between the outgoing light beam and the optical axis AX is the minimum is indicated by a two-dot chain line. Show.
  • the scanning center position Ps of the scanner and the position of the pupil plane Pp are configured to be optically conjugate by the objective lens system 300 in the paraxial region.
  • the pupil position is shown as a plane perpendicular to the optical axis AX, that is, the position of the pupil plane Pp. Therefore, the scanning light beam reflected by the reflecting surface 22A disposed on the optical axis AX intersects the pupil plane Pp via the objective lens system 300.
  • the cross-sectional diameter in the meridional direction on the pupil plane Pp of the light beam substantially parallel to the optical axis indicated by the two-dot chain line is Pmin.
  • the cross-sectional diameter in the meridional direction is Pmax on the pupil plane Pp.
  • FIG. 11 schematically shows the shapes of the two light beams indicated by the broken line and the two-dot chain line in FIG. 10 on the pupil plane of the eye 12 to be examined.
  • the XY plane is shown, and the Y direction is the vertical direction of the paper.
  • the shape of the pupil 12B of the eye 12 to be examined is indicated by a solid line
  • the shape of the light beam when the angle between the emitted light beam and the optical axis AX is the maximum angle ⁇ max
  • the shape of the emitted light beam and the optical axis AX The shape of the light beam when the angle formed is the minimum is indicated by a two-dot chain line.
  • the shape of the light beam indicated by the two-dot chain line is substantially circular, but the shape of the light beam indicated by the broken line is reduced in the Y direction, that is, the meridional direction.
  • the Y direction that is, the meridional direction.
  • conditional expression (13) is satisfied so that the light beam efficiently enters the pupil 12B of the eye 12 to be examined.
  • Pmax ⁇ Pmin (13) If the conditional expression (13) is not satisfied, it is necessary to manage the position of the light beam on the pupil when the angle between the emitted light beam and the optical axis AX is ⁇ max in design and manufacturing, which increases the manufacturing difficulty. End up.
  • conditional expression (14) is satisfied. 0.2 ⁇ Pmin ⁇ Pmax (14) If the conditional expression (14) is not satisfied, the change of the light beam diameter on the retina becomes too remarkable. In addition, as a structure of an ophthalmologic apparatus, it is preferable to satisfy conditional expression (13) and conditional expression (14) simultaneously.
  • FIG. 12 illustrates the relationship between ⁇ out and Pmax / Pmin for an objective lens system according to an example of this embodiment as a solid line.
  • the horizontal axis in FIG. 12 is an angle ⁇ out formed by the light beam incident on the pupil plane Pp through the objective lens system and the optical axis AX, and the vertical axis is Pmax / Pmin.
  • the beam diameter in the meridional direction on the pupil 12B of the eye 12 to be examined should have a relationship of 1 / cos ( ⁇ out).
  • the characteristic of the system in which the light beam diameter is not taken into consideration is indicated by a broken line as a comparative example.
  • the comparative example indicated by the broken line is 320%.
  • Pmax / Pmin is set to 1 or less by suitably designing the objective lens system, which is about 64%.
  • the configuration of the objective lens system according to the present embodiment will be described with reference to FIG.
  • “ ⁇ consists of” is used in the sense that only a lens is considered as a component, and other than a lens (for example, a filter, a prism, etc.) Optical members having no refractive power, diaphragms, etc.) are not considered. That is, in the present specification, “the objective lens system is composed of the front group and the rear group” means that the lens group constituting the objective lens system is only the front group and the rear group, but the objective lens system includes other lenses. It means that it may be comprised including things other than.
  • FIG. 13 is a diagram showing a configuration of the objective lens system according to the present embodiment, and is also a diagram showing a configuration of Example 1-1 described later.
  • the objective lens system 311 shown in FIG. 13 includes a first lens group G1 and a third lens group G3 in order from the scanner side.
  • the first lens group G1 and the third lens group G3 are separated by the maximum air gap in the objective lens system 311.
  • the third lens group G3 is an example of the common lens group 28.
  • This maximum air interval is convenient for providing a combining unit 26 having a light combining and light separating function such as a dichroic mirror, and it is possible to constitute a composite objective lens system for SLO and OCT.
  • the objective lens system 311 includes a front group GF having a positive refractive power and a rear group having a positive refractive power arranged on the eye side of the front group GF. It can be considered that the front group GF and the rear group GR are separated by the maximum air space on the optical axis between the lens surfaces in the objective lens system 311.
  • the first lens group G1 corresponds to the front group GF
  • the third lens group G3 corresponds to the rear group GR.
  • the second lens group G2 corresponds to the front group GF
  • the third lens group G3 is the rear group.
  • the front group GF has a function of converting the tilt angle of light incident from the light source side into a small angle and transmitting it to the rear group GR.
  • the angle with respect to the optical axis AX of the light beam 45 having the maximum angle of view is smaller when it is emitted from the front group GF than when it is incident on the front group GF.
  • the angle of the light beam emitted from the rear group GR toward the eye to be examined with respect to the optical axis AX is very large, and as a result, it is suitable as an objective lens for UWF.
  • the objective lens system according to the present embodiment suitable as an optical system for guiding the light from the light source to the eye to be inspected is the lens surface closest to the eye to be examined from the lens surface closest to the light source in the objective lens system.
  • TL corresponds to the so-called total lens length.
  • Conditional expression (15) is one condition that satisfies the objective lens system that is an afocal optical system.
  • the objective lens system according to the present embodiment satisfies the following conditional expression (16) as a UWF objective lens when the focal length of the front group GF is fF and the focal length of the rear group GR is fR. Is preferred. 1 ⁇ fF / fR ⁇ 4 (16)
  • fF / fR is substantially synonymous with the paraxial angular magnification Mpar.
  • a large external illumination angle can be obtained by satisfying the conditional expression related to Mmax described above together with conditional expression (16).
  • it is more preferable that fF / fR is larger than 1.5 as the objective lens for UWF.
  • the maximum air gap on the optical axis separating the front group GF and the rear group GR is D
  • the objective lens is arranged from the lens surface closest to the light source of the objective lens system.
  • the geometric distance on the optical axis to the lens surface closest to the eye to be examined is TL, it is preferable that the following conditional expression (17) is satisfied. 0.1 ⁇ D / TL ⁇ 0.5 (17) If the lower limit of the conditional expression (17) is not satisfied, the lens density within the predetermined entire lens length is increased and the weight is increased. If the upper limit of conditional expression (17) is not satisfied, the lens components necessary for aberration correction cannot be accommodated within the predetermined total lens length.
  • the rear group GR includes a group A GRA having a positive refractive power and a group B GRB having a positive refractive power arranged on the eye side of the group A GRA.
  • the A group GRA includes at least one cemented lens having a positive refractive power as a whole as a cemented lens, and the lens surface on the subject eye side of the lens closest to the subject eye of the A group GRA is a convex surface or a flat surface.
  • the group B GRB is composed of one or a plurality of positive meniscus lens components having a concave surface facing the eye to be examined. By configuring the B group GRB in this way, the light aberration can be corrected well.
  • conditional expression (18) When the focal length of the B group GRB is fB and the focal length of the rear group GR is fR, it is preferable that the following conditional expression (18) is satisfied. 0.4 ⁇ fB / fR ⁇ 2.5 (18) When the lower limit of conditional expression (18) is not satisfied, it becomes difficult to correct chromatic aberration and higher order aberrations. If the upper limit of conditional expression (18) is not satisfied, the entire lens system becomes large and heavy. Regarding conditional expression (18), it is more preferable to set the lower limit value to 0.5 and the upper limit value to 1.75, and further to set the lower limit value to 0.8 and the upper limit value to 1.1. Is even more preferred.
  • conditional expression (19) when the focal length of the positive lens constituting the cemented lens included in the A group GRA is fAp and the focal length of the rear group GR is fR, all the positive lenses in all the cemented lenses included in the A group GRA Satisfies the following conditional expression (19). 0.9 ⁇ fAp / fR ⁇ 3.7 (19)
  • the lower limit of conditional expression (19) When the lower limit of conditional expression (19) is not satisfied, the volume of the glass material increases, resulting in higher cost and weight. If the upper limit of conditional expression (19) is not satisfied, correction of chromatic aberration is insufficient.
  • the front group GF preferably has a negative refracting lens surface and a positive refracting lens surface disposed on the eye side of the lens surface.
  • the concave surface on the scanner side of the positive meniscus lens becomes the lens surface having the negative refractive power, and the eye to be examined of the positive meniscus lens Since the convex surface on the side becomes a lens surface with positive refractive power, it is possible to correct high-order light aberrations on the wide field angle side.
  • the front group GF has a meniscus lens having a convex surface facing the scanner side
  • the front group GF has a negative lens and a positive lens arranged on the eye side of the negative lens, and an air lens having a negative refractive power can be formed between the negative lens and the positive lens.
  • an air lens having a negative refractive power can be formed between the negative lens and the positive lens.
  • the said negative lens and the said positive lens are arrange
  • the scanner side of the negative lens constituting the air lens further includes a meniscus lens having a concave surface directed toward the eye to be examined, and the positive lens constituting the air lens is provided. It is preferable to further have a positive lens on the eye side to be examined.
  • the A group GRA of the rear group GR has one or more cemented lenses. With this configuration, axial chromatic aberration and pupil chromatic aberration can be corrected.
  • the group A GRA preferably has two or more cemented lenses. With this configuration, axial chromatic aberration and pupil chromatic aberration can be corrected with higher accuracy.
  • the B group GRB of the rear group GR preferably has one or more positive meniscus single lenses. With this lens, it is possible to receive a light having a wide angle of view closest to the eye to be examined aplanatically and bend so as not to generate higher-order light aberrations, particularly field curvature and coma. By using a single lens, no extra light aberration due to the cemented surface occurs. In order to enhance this effect, it is preferable that the B group GRB is composed of only one or a plurality of positive meniscus single lenses.
  • the objective lens system 311 shown in FIG. 13 has a plurality of the above-mentioned preferable configurations, and the emitted light and the light of the objective lens system when the light beam 45 having the maximum angle of view is emitted from the objective lens system 311 to the eye to be examined.
  • the angle formed with the axis AX is 50 degrees or more. This means that the objective lens system 311 is a fundus optical system with a wide angle of view.
  • Example 1-1, Example 2-1, Example 3-1, Example 4-1, Example 5-1, Example 6-1, Example 7-1, Example 8-1, Example 9-1, Example 10-1, and Example 11-1 are examples of the objective lens system for SLO.
  • Examples 1-2, 2-2, and Example 3-2 is an example of an OCT objective lens system.
  • Example 1-1 and Example 1-2 have a common lens group, and Example 1-1 and Example 1-2 constitute Example 1 of the composite objective lens system. Can do.
  • Example 2-1 and Example 2-2 have a common lens group, and Example 2-1 and Example 2-2 constitute Example 2 of the composite objective lens system. be able to.
  • Example 3-1 and Example 3-2 have a common lens group, and Example 3-1 and Example 3-2 constitute Example 3 of the composite objective lens system. be able to.
  • Each example is an ultra-wide-angle objective lens system in which the above-described ⁇ max easily exceeds 60 degrees and reaches 72 degrees. Since the external illumination angle can be twice as large as ⁇ max, the following embodiments enable viewing of the fundus with an external illumination angle of 120 to 144 degrees and an internal illumination angle exceeding 200 degrees. This makes it possible to realize an ultra-wide-angle ophthalmic device.
  • Example 1-1 is an objective lens system 311 that assumes an SLO objective lens system having a wavelength range of 450 nm to 650 nm and a reference wavelength of 520 nm.
  • FIG. 13 shows a diagram of the lens configuration of the objective lens system 311 of Example 1-1 together with the scanning center position Ps of the scanner and the pupil plane Pp of the eye 12 to be examined. Note that Ps and Pp in the drawing are shown to show positions in the optical axis direction, and do not show the shape or size.
  • the objective lens system 311 includes a first lens group G1 and a third lens group G3 in order from the scanner side. The first lens group G1 and the third lens group G3 are separated by the maximum air gap in the objective lens system 311.
  • the first lens group G1 includes a meniscus lens L11 having a convex surface facing the scanner, a meniscus lens L12 having a convex surface facing the scanner, a negative lens L13 having a concave surface on the scanner side, and a positive meniscus having a convex surface facing the eye to be examined.
  • a lens L14 and a positive lens L15 are included.
  • the lens L11 and the lens L12 are joined together to form a meniscus lens component having a convex surface facing the scanner, and the most lens surface on the scanner side is an aspherical surface.
  • the third lens group G3 includes a positive lens L31, a positive lens L32, a negative lens L33, a positive lens L34, a biconcave negative lens L35, and a positive meniscus lens L36 having a concave surface facing the eye to be examined. More specifically, regarding the shape of the positive lens L34, the absolute value of the radius of curvature of the lens surface on the scanner side is smaller than the absolute value of the radius of curvature of the lens surface on the eye side to be examined.
  • the lens L32 and the lens L33, and the lens L34 and the lens L35 are cemented with each other. More specifically, the lens L32 and the lens L33 are joined to form a biconvex lens component, and the lens L34 and the lens L35 form a positive lens component with a convex surface facing the scanner side.
  • the objective lens system 311 can be considered to be composed of the front group GF and the rear group GR described above.
  • the front group GF corresponds to the first lens group G1
  • the rear group GR corresponds to the third lens group G3.
  • the A group GRA includes a lens L31, a lens L32, and a lens L33.
  • the B group GRB includes a lens L34, a lens L35, and a lens L36.
  • Table 1 shows lens data of Example 1-1.
  • the surface number, the radius of curvature, the surface spacing on the optical axis, the d-line (wavelength 587.56 nm) -based refractive index, and the d-line-based Abbe number are shown in order from the left column.
  • the first surface of the lens data is the scanning center position Ps of the scanner, and the value in the last row of the thickness column indicates the distance on the optical axis from the lens surface closest to the eye to be examined to the pupil surface Pp in the table.
  • (ASP) is written in the column of the surface number for the aspheric surface.
  • the height of the aspheric surface in the direction perpendicular to the optical axis is h
  • the distance (sag amount) along the optical axis from the tangent plane at the apex of the aspheric surface to the position on the aspheric surface at height h is zs.
  • the inverse of the paraxial radius of curvature is c
  • the conic coefficient is k
  • the fourth-order aspheric coefficient is A
  • the sixth-order aspheric coefficient is B
  • the eighth-order aspheric coefficient is C
  • the tenth-order aspheric coefficient is written in the column of the surface number for the aspheric surface.
  • Is represented by the following formula where D is D and the 12th-order aspherical coefficient is E.
  • zs (c ⁇ h 2 ) / [1+ ⁇ 1 ⁇ (1 + k) ⁇ h 2 ⁇ c 2 ⁇ 1/2 ] + A ⁇ h 4 + B ⁇ h 6 + C ⁇ h 8 + D ⁇ h 10 + E ⁇ h 12
  • Table 2 shows the aspheric coefficients of the aspheric surfaces of Example 1-1.
  • “En” (n is an integer) in Table 2 means “ ⁇ 10 ⁇ n ”. Note that the lens data and aspherical coefficient description method and the configuration drawing method described above are basically the same for the following embodiments.
  • FIG. 14 shows the relationship between ⁇ out and M in Example 1-1.
  • the relationship between ⁇ out and Pmax / Pmin in Example 1-1 is indicated by a solid line, and the curve of 1 / cos ( ⁇ out) is indicated by a broken line.
  • Example 1-1 is an SLO objective lens system having an external irradiation angle of 132 degrees, and as shown in FIGS. 14 and 15, it is clear that the lens has excellent performance as a UWF objective lens.
  • Example 1-2 is an objective lens system 321 assuming an OCT objective lens system having a wavelength range of 900 nm to 1050 nm and a reference wavelength of 1000 nm.
  • FIG. 16 illustrates a lens configuration of the objective lens system 321 of Example 1-2.
  • the objective lens system 321 includes a second lens group G2 and a third lens group G3 in order from the scanner side.
  • the second lens group G2 and the third lens group G3 are separated by the maximum air gap in the objective lens system 321. This longest air interval is convenient for providing a synthesizing unit 26 having a light synthesizing and light separating function such as a dichroic mirror, and it is possible to constitute a composite type objective lens system for SLO and OCT.
  • the second lens group G2 has a configuration similar to that of the first lens group G1 of Example 1-1 described above, but the meniscus lens component having a convex surface facing the scanner side closest to the scanner side has a biconvex shape. It is formed by a cemented lens of a positive lens L21 and a biconcave negative lens L22.
  • the third lens group G3 of Example 1-2 is common to the third lens group G3 of Example 1-1.
  • the objective lens system 321 can be considered to be composed of the front group GF and the rear group GR described above.
  • the front group GF corresponds to the second lens group G2
  • the rear group GR corresponds to the third lens group G3.
  • the lenses constituting the A group GRA and the B group GRB are the same as in Example 1-1.
  • Table 3 shows lens data of Example 1-2.
  • Table 4 shows the aspheric coefficients of the aspheric surfaces of Example 1-2.
  • FIG. 17 shows the relationship between ⁇ out and M in Example 1-2.
  • the relationship between ⁇ out and Pmax / Pmin in Example 1-2 is indicated by a solid line, and the curve of 1 / cos ( ⁇ out) is indicated by a broken line.
  • Example 1-2 is an OCT objective lens system having an external irradiation angle of 128 degrees, and as shown in FIG. 17 and FIG. 18, it is clear that it has excellent performance as a UWF objective lens.
  • Example 2-1 is an objective lens system 312 that assumes an SLO objective lens system.
  • FIG. 19 shows a lens configuration of the objective lens system 312 of Example 2-1.
  • the objective lens system 312 includes a first lens group G1 and a third lens group G3 in order from the scanner side.
  • the first lens group G1 and the third lens group G3 are separated by a maximum air interval in the objective lens system 312.
  • the first lens group G1 includes a biconvex positive lens L11, a biconcave negative lens L12, a biconcave negative lens L13, a positive lens L14 having a convex surface facing the eye to be examined, and a positive lens L15.
  • the lens L11 and the lens L12 are joined together to form a meniscus lens component having a convex surface facing the scanner, and the most lens surface on the scanner side is an aspherical surface.
  • the third lens group G3 includes a positive lens L31, a biconvex positive lens L32, a biconcave negative lens L33, a positive lens L34 having a convex surface facing the scanner, and a positive meniscus lens L35 having a concave surface facing the eye to be examined. including.
  • the lens L32 and the lens L33 are joined together to form a meniscus lens component having a convex surface facing the scanner side.
  • the objective lens system 312 can be considered to be composed of the front group GF and the rear group GR described above.
  • the front group GF corresponds to the first lens group G1
  • the rear group GR corresponds to the third lens group G3.
  • the A group GRA includes a lens L31, a lens L32, a lens L33, and a lens L34.
  • the B group GRB includes a lens L35.
  • Table 5 shows lens data of Example 2-1.
  • Table 6 shows the aspheric coefficients of the aspheric surfaces of Example 2-1.
  • FIG. 20 shows the relationship between ⁇ out and M in Example 2-1.
  • the relationship between ⁇ out and Pmax / Pmin in Example 2-1 is indicated by a solid line, and the 1 / cos ( ⁇ out) curve is indicated by a broken line.
  • Example 2-1 is an objective lens system for SLO having an external irradiation angle of 144 degrees, and as shown in FIGS. 20 and 21, it is clear that it has excellent performance as an objective lens for UWF.
  • Example 2-2 is an objective lens system 322 that assumes an OCT objective lens system.
  • FIG. 22 shows a diagram of the lens configuration of the objective lens system 322 of Example 2-2.
  • the objective lens system 322 includes a second lens group G2 and a third lens group G3 in order from the scanner side.
  • the second lens group G2 and the third lens group G3 are separated by the maximum air gap in the objective lens system 322.
  • the second lens group G2 has a configuration similar to that of the first lens group G1 of Example 2-1 shown in FIG.
  • the third lens group G3 of Example 2-2 is common to the third lens group G3 of Example 2-1.
  • the objective lens system 322 can be considered to be composed of the front group GF and the rear group GR described above.
  • the front group GF corresponds to the second lens group G2
  • the rear group GR corresponds to the third lens group G3.
  • the lenses constituting the A group GRA and the B group GRB are the same as in Example 2-1.
  • Table 7 shows lens data of Example 2-2.
  • Table 8 shows the aspheric coefficients of the aspheric surfaces of Example 2-2.
  • FIG. 23 shows the relationship between ⁇ out and M in Example 2-2.
  • the relationship between ⁇ out and Pmax / Pmin in Example 2-2 is shown by a solid line, and the 1 / cos ( ⁇ out) curve is shown by a broken line.
  • Example 2-2 is an OCT objective lens system having an external irradiation angle of 144 degrees, and as shown in FIGS. 23 and 24, clearly has excellent performance as a UWF objective lens.
  • Example 3-1 is an objective lens system 313 that assumes an SLO objective lens system.
  • FIG. 25 shows a lens configuration of the objective lens system 313 of Example 3-1.
  • the objective lens system 313 includes a first lens group G1 and a third lens group G3 in order from the scanner side.
  • the first lens group G1 and the third lens group G3 are separated by the maximum air gap in the objective lens system 313.
  • the first lens group G1 includes a negative meniscus lens L11 having a convex surface facing the scanner, a positive meniscus lens L12 having a convex surface facing the scanner, a biconcave negative lens L13, and a positive lens L14 having a convex surface facing the eye to be examined. And a positive lens L15.
  • the lens L11 and the lens L12 are joined together to form a meniscus lens component having a convex surface facing the scanner side.
  • the third lens group G3 includes a negative meniscus lens L31 having a convex surface facing the scanner, a biconvex positive lens L32, a biconvex positive lens L33, a negative meniscus lens L34 having a convex surface facing the eye to be examined, and the scanner side.
  • the lens L31 and the lens L32 are joined to form a biconvex positive lens component, and the lens L33 and the lens L34 are also joined to each other to form a biconvex positive lens component.
  • the third lens group G3 of Example 3-1 is also provided with two cemented lenses as in Example 1-1 (FIG. 13), but the third lens group of Example 1-1.
  • the two joint surfaces of G3 are both convex toward the eye to be examined, but in Example 3-1, the joint surfaces are formed with the concave surfaces facing each other.
  • the lens surface closest to the eye to be examined is an aspherical surface.
  • the objective lens system 313 can be considered to be composed of the front group GF and the rear group GR described above.
  • the front group GF corresponds to the first lens group G1
  • the rear group GR corresponds to the third lens group G3.
  • the A group GRA includes a lens L31, a lens L32, a lens L33, a lens L34, and a lens L35.
  • the B group GRB includes a lens L36.
  • Table 9 shows lens data of Example 3-1.
  • Table 10 shows the aspheric coefficients of the aspheric surfaces of Example 3-1.
  • FIG. 26 shows the relationship between ⁇ out and M in Example 3-1.
  • the relationship between ⁇ out and Pmax / Pmin in Example 3-1 is indicated by a solid line, and the 1 / cos ( ⁇ out) curve is indicated by a broken line.
  • This Example 3-1 is also an SLO objective lens system with an external irradiation angle of 144 degrees, and it is clear that it has excellent performance as a UWF objective lens as shown in FIGS.
  • Example 3-2 is an objective lens system 323 that assumes an OCT objective lens system.
  • FIG. 28 shows a lens configuration of the objective lens system 323 of Example 3-2.
  • the objective lens system 323 includes a second lens group G2 and a third lens group G3 in order from the scanner side.
  • the second lens group G2 and the third lens group G3 are separated by the maximum air gap in the objective lens system 323.
  • the second lens group G2 has a configuration similar to that of the first lens group G1 shown in FIG.
  • the meniscus lens component having a convex surface facing the scanner side closest to the scanner side of the first lens group G1 in Example 3-1 has the smallest center thickness in the first lens group G1, whereas this example 3 -2 has the largest center thickness in the first lens group G1.
  • the third lens group G3 in Example 3-2 is common to the third lens group G3 in Example 3-1.
  • the objective lens system 323 can be considered to be composed of the above-described front group GF and rear group GR.
  • the front group GF corresponds to the second lens group G2
  • the rear group GR corresponds to the third lens group G3.
  • the lenses constituting the A group GRA and the B group GRB are the same as in Example 3-1.
  • Table 11 shows lens data of Example 3-2.
  • Table 12 shows the aspheric coefficients of the aspheric surfaces of Example 3-2.
  • FIG. 29 shows the relationship between ⁇ out and M in Example 3-2.
  • the relationship between ⁇ out and Pmax / Pmin in Example 3-2 is indicated by a solid line, and the 1 / cos ( ⁇ out) curve is indicated by a broken line.
  • This Example 3-2 is also an OCT objective lens system with an external irradiation angle of 144 degrees, and as shown in FIGS. 29 and 30, it is clear that it has excellent performance as a UWF objective lens.
  • Example 4-1 is an objective lens system 314 that assumes an SLO objective lens system.
  • FIG. 31 shows a lens configuration of the objective lens system 314 of Example 4-1.
  • the objective lens system 314 includes a first lens group G1 and a third lens group G3 in order from the scanner side.
  • the first lens group G1 and the third lens group G3 are separated by the maximum air gap in the objective lens system 314.
  • the first lens group G1 includes a positive meniscus lens L11 having a concave surface facing the scanner, a negative meniscus lens L12 having a concave surface facing the scanner, a negative meniscus lens L13 having a convex surface facing the scanner, and a positive lens L14.
  • the lens L11 and the lens L12 are joined together to form a meniscus lens component having a concave surface facing the scanner side.
  • the third lens group G3 includes a positive lens L31, a biconvex positive lens L32, a negative lens L33 having a concave surface facing the scanner, a positive meniscus lens L34 having a concave surface facing the eye to be examined, and a concave surface facing the eye to be examined.
  • a positive meniscus lens L35 is a positive meniscus lens L35.
  • a diffractive optical element (abbreviated as DOE) is provided on the convex surface on the scanner side.
  • DOE diffractive optical element
  • Providing a diffractive optical element on the lens surface not only facilitates correction of chromatic aberration, but also enables use of refraction by the lens surface and diffraction by the diffractive optical element, thereby reducing the effective diameter of the lens. is there.
  • the diffractive optical element can be provided on another lens surface. For example, it is effective to provide the diffractive optical element on a lens having a large effective diameter, such as the lens L31, or the lens L11 and the lens L12 that constitute the lens component closest to the scanner. .
  • the objective lens system 314 can be considered to be composed of the front group GF and the rear group GR described above.
  • the front group GF corresponds to the first lens group G1
  • the rear group GR corresponds to the third lens group G3.
  • the A group GRA includes a lens L31.
  • the B group GRB includes a lens L32, a lens L33, a lens L34, and a lens L35.
  • Table 13 shows lens data of Example 4-1.
  • Table 14 shows the phase coefficients of the diffraction surfaces of Example 4-1. “En” (n is an integer) in Table 20 means “ ⁇ 10 ⁇ n ”.
  • FIG. 32 shows the relationship between ⁇ out and M in Example 4-1.
  • the relationship between ⁇ out and Pmax / Pmin in Example 4-1 is indicated by a solid line, and the curve of 1 / cos ( ⁇ out) is indicated by a broken line.
  • Example 4-1 is an objective lens system for SLO having an external irradiation angle of 130 degrees, and as shown in FIGS. 32 and 33, it is clear that it has excellent performance as an objective lens for UWF.
  • Example 5-1 is an objective lens system 315 that assumes an SLO objective lens system.
  • FIG. 34 shows a lens configuration of the objective lens system 315 of Example 5-1.
  • the objective lens system 315 includes a first lens group G1 and a third lens group G3 in order from the scanner side.
  • the first lens group G1 and the third lens group G3 are separated by the maximum air gap in the objective lens system 315.
  • the first lens group G1 includes a negative meniscus lens L11 having a convex surface facing the scanner and a positive meniscus lens L12 having a convex surface facing the eye to be examined.
  • the third lens group G3 includes a negative meniscus lens L31 having a convex surface facing the scanner, a biconvex positive lens L32, a biconvex positive lens L33, a negative meniscus lens L34 having a convex surface facing the eye to be examined, and a biconvex lens.
  • a positive lens L35 having a shape, a negative meniscus lens L36 having a convex surface facing the eye to be examined, a positive lens L37 having a convex surface facing the scanner, a positive meniscus lens L38 having a concave surface facing the eye to be examined, and a concave surface facing the eye to be examined A positive meniscus lens L39.
  • the lens L31 and the lens L32 are joined together to form a biconvex positive lens component.
  • the lens L33 and the lens L34 are joined together to form a biconvex positive lens component.
  • the lens L35 and the lens L36 are joined together to form a biconvex positive lens component.
  • the objective lens system 315 can be considered to be composed of the front group GF and the rear group GR described above.
  • the front group GF corresponds to the first lens group G1
  • the rear group GR corresponds to the third lens group G3.
  • the A group GRA includes a lens L31, a lens L32, a lens L33, a lens L34, a lens L35, a lens L36, and a lens L37.
  • the B group GRB includes a lens L38 and a lens L39.
  • Table 15 shows lens data of Example 5-1.
  • Example 5-1 The relationship between ⁇ out and M in Example 5-1 has the same tendency qualitatively as Example 1-1 to Example 4-1.
  • the relationship between ⁇ out and Pmax / Pmin in Example 5-1 has the same qualitative tendency as in Example 3-1, but in Example 5-1, when ⁇ out is 70 degrees, Pmax / Pmin is It takes a value of 140% or less.
  • Example 6-1 is an objective lens system 316 that assumes an SLO objective lens system.
  • FIG. 35 shows a lens configuration of the objective lens system 316 of Example 6-1.
  • the objective lens system 316 includes a first lens group G1 and a third lens group G3 in order from the scanner side.
  • the first lens group G1 and the third lens group G3 are separated by a maximum air space in the objective lens system 316.
  • the first lens group G1 includes a biconvex positive lens L11, a biconcave negative lens L12, and a positive meniscus lens L13 having a convex surface facing the eye to be examined.
  • the lens L11 and the lens L12 are joined together to form a meniscus lens component having a convex surface facing the scanner side.
  • the third lens group G3 includes a negative meniscus lens L31 having a convex surface facing the scanner, a biconvex positive lens L32, a biconvex positive lens L33, a negative lens L34 having a concave surface facing the scanner, and an eye side to be examined.
  • a positive meniscus lens L35 having a concave surface, a positive meniscus lens L36 having a concave surface facing the eye to be examined, and a positive meniscus lens L37 having a concave surface facing the eye to be examined are included.
  • the lens L31 and the lens L32 are joined together to form a biconvex positive lens component.
  • the lens L33 and the lens L34 are joined together to form a biconvex positive lens component.
  • the objective lens system 316 can be considered to be composed of the front group GF and the rear group GR described above.
  • the front group GF corresponds to the first lens group G1
  • the rear group GR corresponds to the third lens group G3.
  • the A group GRA includes a lens L31, a lens L32, a lens L33, and a lens L34.
  • the B group GRB includes a lens L35, a lens L36, and a lens L37.
  • Table 16 shows lens data of Example 6-1.
  • Example 6-1 The relationship between ⁇ out and M in Example 6-1 has the same tendency qualitatively as Example 1-1 to Example 4-1.
  • the relationship between ⁇ out and Pmax / Pmin in Example 6-1 has the same qualitative tendency as in Example 3-1, but in Example 6-1, when ⁇ out is 70 degrees, Pmax / Pmin is It takes a value of 140% or less.
  • Example 7-1 is an objective lens system 317 that assumes an SLO objective lens system.
  • FIG. 36 shows a lens configuration of the objective lens system 317 of Example 7-1.
  • the objective lens system 317 includes a first lens group G1 and a third lens group G3 in order from the scanner side.
  • the first lens group G1 and the third lens group G3 are separated by the maximum air gap in the objective lens system 317.
  • the first lens group G1 includes a negative meniscus lens L11 having a convex surface facing the scanner side and a positive lens L12 having a convex surface facing the eye to be examined.
  • the lens surfaces of the lens L12 on the scanner side and the eye side to be examined are aspherical surfaces.
  • the third lens group G3 includes a positive meniscus lens L31 having a convex surface facing the eye to be examined, a biconvex positive lens L32, a negative meniscus lens L33 having a convex surface facing the eye to be examined, a biconvex positive lens L34, both A concave negative lens L35, a biconvex positive lens L36, a positive meniscus lens L37 having a concave surface facing the eye to be examined, and a positive meniscus lens L38 having a concave surface facing the eye to be examined are included.
  • the lens L32 and the lens L33 are joined together to form a biconvex positive lens component.
  • the lens L34 and the lens L35 are bonded to each other to form a meniscus lens component having a concave surface facing the eye to be examined.
  • the objective lens system 317 can be considered to be composed of the front group GF and the rear group GR described above.
  • the front group GF corresponds to the first lens group G1
  • the rear group GR corresponds to the third lens group G3.
  • the A group GRA includes a lens L31, a lens L32, a lens L33, a lens L34, a lens L35, and a lens L36.
  • the B group GRB includes a lens L37 and a lens L38.
  • Table 17 shows lens data of Example 7-1.
  • Table 18 shows the aspheric coefficients of the aspheric surfaces of Example 7-1.
  • Example 7-1 The relationship between ⁇ out and M in Example 7-1 has the same tendency qualitatively as Example 1-1 to Example 4-1.
  • the relationship between ⁇ out and Pmax / Pmin in Example 7-1 has the same tendency qualitatively as Example 1-1.
  • Example 8-1 is an objective lens system 318 that assumes an SLO objective lens system.
  • FIG. 37 shows a lens configuration of the objective lens system 318 of Example 8-1.
  • the objective lens system 318 includes a first lens group G1 and a third lens group G3 in order from the scanner side.
  • the first lens group G1 and the third lens group G3 are separated by a maximum air gap in the objective lens system 318.
  • the first lens group G1 includes a positive meniscus lens L11 having a concave surface facing the scanner side.
  • the lens surface on the scanner side of the lens L11 is an aspherical surface.
  • the third lens group G3 includes a biconvex positive lens L31, a biconcave negative lens L32, a biconvex positive lens L33, a negative meniscus lens L34 having a concave surface facing the eye to be examined, and a concave surface facing the eye to be examined.
  • a positive meniscus lens L35 having a concave surface facing the eye to be examined
  • a positive meniscus lens L38 having a concave surface facing the eye to be examined.
  • the lens L32 and the lens L33 are bonded to each other to form a meniscus lens component having a convex surface facing the eye to be examined.
  • the lens L34 and the lens L35 are bonded to each other to form a meniscus lens component having a concave surface facing the eye to be examined.
  • the objective lens system 318 can be considered to be composed of the front group GF and the rear group GR described above.
  • the front group GF corresponds to the first lens group G1
  • the rear group GR corresponds to the third lens group G3.
  • the A group GRA includes a lens L31, a lens L32, a lens L33, a lens L34, a lens L35, and a lens L36.
  • the B group GRB includes a lens L37 and a lens L38.
  • Table 19 shows lens data of Example 8-1.
  • Table 20 shows the aspheric coefficients of the aspheric surfaces of Example 8-1.
  • Example 8-1 The relationship between ⁇ out and M in Example 8-1 has the same tendency qualitatively as Example 1-1 to Example 4-1.
  • the relationship between ⁇ out and Pmax / Pmin in Example 8-1 has the same qualitative tendency as in Example 1-1 to Example 2-2.
  • Example 9-1 is an objective lens system 319 that assumes an SLO objective lens system.
  • FIG. 38 shows a lens configuration of the objective lens system 319 of Example 9-1.
  • the objective lens system 319 includes a first lens group G1 and a third lens group G3 in order from the scanner side.
  • the first lens group G1 and the third lens group G3 are separated by the maximum air gap in the objective lens system 319.
  • the first lens group G1 includes a negative meniscus lens L11 having a convex surface facing the scanner, a biconvex positive lens L12, a biconcave negative lens L13, a biconcave negative lens L14, and a biconvex positive lens L15. And a positive lens L16 having a convex surface facing the eye to be examined.
  • the lens L11 and the lens L12 are joined to each other to form a biconvex lens component.
  • the lens L14 and the lens L15 are joined to each other to form a meniscus lens component having a convex surface directed toward the eye to be examined.
  • the third lens group G3 includes a biconvex positive lens L31, a negative meniscus lens L32 having a convex surface facing the eye to be examined, a biconvex positive lens L33, and a positive meniscus lens L34 having a concave surface facing the eye to be examined. .
  • the lens L31 and the lens L32 are cemented to form a biconvex positive lens component.
  • the objective lens system 319 can be considered to be composed of the front group GF and the rear group GR described above.
  • the front group GF corresponds to the first lens group G1
  • the rear group GR corresponds to the third lens group G3.
  • the A group GRA includes a lens L31, a lens L32, and a lens L33.
  • the B group GRB includes a lens L34.
  • Table 21 shows lens data of Example 9-1.
  • Example 9-1 The relationship between ⁇ out and M in Example 9-1 has the same tendency qualitatively as Example 1-1 to Example 4-1.
  • the relationship between ⁇ out and Pmax / Pmin in Example 9-1 has the same tendency qualitatively as Example 1-1.
  • Example 10-1 is an objective lens system 3110 that assumes an SLO objective lens system.
  • FIG. 39 shows a lens configuration of the objective lens system 3110 of Example 10-1.
  • the objective lens system 3110 includes a first lens group G1 and a third lens group G3 in order from the scanner side.
  • the first lens group G1 and the third lens group G3 are separated by a maximum air gap in the objective lens system 3110.
  • the first lens group G1 includes a biconcave negative lens L11, a positive meniscus lens L12 having a convex surface facing the eye to be examined, a positive meniscus lens L13 having a convex surface facing the scanner, and a biconcave negative lens L14.
  • the third lens group G3 has a biconvex positive lens L31, a biconcave negative lens L32, a biconvex positive lens L33, a positive lens L34 having a convex surface facing the scanner, and a concave surface facing the eye to be examined.
  • a positive meniscus lens L35 is included.
  • the lens L31 and the lens L32 are cemented to form a meniscus lens component.
  • the objective lens system 3110 can be considered to be composed of the front group GF and the rear group GR described above.
  • the front group GF corresponds to the first lens group G1
  • the rear group GR corresponds to the third lens group G3.
  • the A group GRA includes a lens L31, a lens L32, a lens L33, and a lens L34.
  • the B group GRB includes a lens L35.
  • Table 22 shows lens data of Example 10-1.
  • Example 10-1 The relationship between ⁇ out and M in Example 10-1 has the same tendency qualitatively as Example 1-1 to Example 4-1.
  • the relationship between ⁇ out and Pmax / Pmin in Example 10-1 has the same tendency qualitatively as Example 1-1.
  • Example 11-1 is an objective lens system 3111 that assumes an SLO objective lens system.
  • FIG. 40 shows a lens configuration of the objective lens system 3111 of Example 11-1.
  • the objective lens system 3111 includes a first lens group G1 and a third lens group G3 in order from the scanner side.
  • the first lens group G1 and the third lens group G3 are separated by the maximum air gap in the objective lens system 3111.
  • the first lens group G1 includes a positive meniscus lens L11 having a convex surface facing the eye to be examined, a negative meniscus lens L12 having a convex surface facing the scanner, a positive lens L13 having a convex surface facing the scanner, and a biconcave negative lens L14.
  • a biconvex positive lens L15 is included.
  • the lens L14 and the lens L15 are cemented to form a meniscus lens component.
  • the third lens group G3 includes a negative meniscus lens L31 having a convex surface facing the scanner, a biconvex positive lens L32, a positive meniscus lens L33 having a concave surface facing the eye to be examined, and a positive meniscus having a concave surface facing the eye to be examined.
  • a lens L34 is included.
  • the lens L31 and the lens L32 are cemented to form a biconvex positive lens component.
  • the objective lens system 3111 includes the front group GF and the rear group GR described above.
  • the front group GF corresponds to the first lens group G1
  • the rear group GR corresponds to the third lens group G3.
  • the A group GRA includes a lens L31 and a lens L32.
  • the B group GRB includes a lens L33 and a lens L34.
  • Table 23 shows lens data of Example 11-1.
  • Example 11-1 The relationship between ⁇ out and M in Example 11-1 has the same tendency qualitatively as Example 1-1 to Example 4-1.
  • the relationship between ⁇ out and Pmax / Pmin in Example 11-1 has the same tendency qualitatively as Example 1-1.
  • Tables 24 to 27 show the corresponding values of the conditional expressions of the respective examples.
  • the fAp / fR (min) column shows the minimum value of fAp / fR in each example
  • the fAp / fR (max) column shows the maximum value of fAp / fR in each example.
  • Each of the above embodiments is a UWF optical system with an external illumination angle exceeding 120 degrees, and the axial distance from the lens surface closest to the eye to be examined to the pupil plane Pp of the eye to be examined is a so-called working distance of 25 mm or more. ing.
  • the working distance of the UWF optical system is 20 mm or more, preferably 22 mm or more.
  • the burden on the subject can be reduced.
  • the upper limit of 42 mm can be said from the viewpoint of performance and cost of the optical system and ease of manufacture.
  • FIG. 41 shows a cross-sectional view of the configuration of another embodiment of the photographing optical system.
  • the photographing optical system shown in FIG. 41 is greatly different in that it has a relay optical system.
  • the imaging optical system of FIG. 41 includes a first relay system 601 and an objective lens system 600 in the optical path between the first optical scanner 22 and the eye 12 to be examined, and between the second optical scanner 24 and the eye 12 to be examined.
  • a second relay system 602 and an objective lens system 600 are included in the optical path.
  • the first relay system 601 includes a first sub lens group RG1 and a common sub lens group RG3 in order from the first optical scanner 22 side.
  • the second relay system 602 includes a second sub lens group RG2 and a common sub lens group RG3 in order from the second optical scanner 24 side.
  • the 41 includes a combining unit 626 having the same function as the combining unit 26 of FIG.
  • the combining unit 626 is disposed between the first sub lens group RG1 and the common sub lens group RG3, and is disposed between the second sub lens group RG2 and the common sub lens group RG3.
  • the scanning light beam passing between the first sub lens group RG1 and the common sub lens group RG3 is parallel light and can be shared with the second sub lens group RG2 so as to be compatible with the combining unit 626 having incident angle dependency.
  • the scanning light flux passing between the sub lens group RG3 is also configured to be parallel light.
  • the common lens group includes a common sub-lens group RG3 and an objective lens system 600.
  • the light angle-scanned by the first optical scanner 22 sequentially passes through the first sub lens group RG1, the synthesis unit 626, the common sub lens group RG3, and the objective lens system 600, and reaches the eye 12 to be examined.
  • the light angularly scanned by the second optical scanner 24 sequentially passes through the second sub lens group RG2, the combining unit 626, the common sub lens group RG3, and the objective lens system 600, and reaches the eye 12 to be examined.
  • the first relay system 601 forms a relay conjugate position Pr in a conjugate relationship with the first optical scanner 22 in the optical path between the combining unit 626 and the eye 12 to be examined.
  • the relay conjugate position Pr is formed in the optical path between the first relay system 601 and the objective lens system 600 by the first relay system 601.
  • the second optical system 24 and the relay conjugate position Pr are in a conjugate relationship via the combining unit 626 by the second relay system 602.
  • the objective lens system 600 has a conjugate relationship between the relay conjugate position Pr and the pupil position of the eye 12 to be examined. Therefore, also in the configuration example shown in FIG.
  • the first optical scanner 22 and the pupil position of the subject eye 12 have a conjugate relationship
  • the second optical scanner 24 and the pupil position of the subject eye 12 have a conjugate relationship.
  • 41 even when a large external irradiation angle similar to that in the example shown in FIG. 3 is obtained by using a relay system, the diameter of the combining unit 626 in FIG. 41 is made larger than that in the combining unit 26 in FIG. Since the size can be reduced, the diameter of the combining portion can be reduced, and the cost can be reduced. In an ultra-wide-angle ophthalmic optical system in which the diameter of the optical member tends to increase, a significant cost reduction can be expected by using a relay system.
  • MR1 is the paraxial angle magnification of the first relay system 601 from the first optical scanner 22 to the relay conjugate position Pr
  • MR2 is the second relay system 602 from the second optical scanner 24 to the relay conjugate position Pr.
  • conditional expression (20) the same effect as when conditional expression (1) is satisfied can be obtained.
  • MR1 preferably satisfies the following conditional expression (21). From conditional expression (20) and conditional expression (21), it is preferable that MR2 satisfies the following conditional expression (22).
  • 1 (21)
  • the first sub lens group RG1 shown in FIG. 41 includes a positive meniscus lens Lr11 having a concave surface directed toward the first optical scanner 22 in order from the first optical scanner 22 side toward the eye to be examined, and a biconvex shape.
  • Positive lens Lr12 and a biconcave negative lens Lr13 are joined to form a meniscus lens component having a convex surface facing the first optical scanner 22 side.
  • the first sub lens group RG1 and the common sub lens group RG3 are configured symmetrically with respect to a plane perpendicular to the optical axis. That is, the common secondary lens group RG3 has a concave surface facing the eye side to be examined, in order from the first optical scanner 22 side to the eye side to be examined, a biconcave negative lens Lr31, a biconvex shape positive lens Lr32. And a positive meniscus lens Lr33.
  • the lens Lr31 and the lens Lr32 are joined to form a meniscus lens component having a convex surface facing the eye to be examined.
  • 41 has at least one positive lens and at least one negative lens, and has concave lens surfaces that are separated from each other by an air gap.
  • the first optical scanner 22 may be configured to scan only one of the X direction and the Y direction.
  • the second optical scanner 24 may be configured to scan only one of the X direction and the Y direction.
  • both scanners are one-dimensional scanners, by providing a one-dimensional scanner in a direction orthogonal to the one-dimensional scanning direction at the relay conjugate position Pr that is a pupil conjugate position by the relay system, A light beam can be angularly scanned two-dimensionally on the pupil plane of the eye to be examined.
  • the third optical scanner 625 is arranged at the relay conjugate position Pr, and the first optical scanner 622 is arranged instead of the first optical scanner 22 in FIG.
  • the second optical scanner 624 is arranged in place of the second optical scanner 24 in FIG.
  • the first optical scanner 622 and the second optical scanner 624 are configured to scan only one of the X direction and the Y direction, and the third optical scanner 625 is configured to scan the first optical scanner 622 and the second optical scanner 624.
  • the scanning direction is orthogonal to the scanning direction.
  • the Y direction is scanned using a polygon mirror as the first optical scanner 622
  • the Y direction is scanned using a galvano mirror as the second optical scanner 624
  • the X direction is scanned using a galvano mirror as the third optical scanner 625.
  • You may comprise so that it may scan.
  • FIG. 41 shows an example in which the above-described Example 9-1 is used as the objective lens system 600.
  • lens data and aspheric coefficients of the first relay system 601 illustrated in FIG. 41 are shown in Tables 28 and 29, respectively, and lens data and aspheric coefficients of the second relay system 602 are shown. 30 and Table 31 respectively.
  • Table 32 shows the corresponding values of the conditional expressions of the optical system combining the examples of the relay systems shown in Tables 28 to 31 and the objective lens system of Example 9-1.
  • M1 is the paraxial angular magnification of the optical system that combines the first relay system 601 and the objective lens system 600
  • M2 is the paraxial of the optical system that combines the second relay system 602 and the objective lens system 600.
  • Angular magnification This replaces the SLO objective lens system 31 shown in FIG. 3 with an optical system in which the first relay system 601 and the objective lens system 600 shown in FIG. 41 are combined, and the OCT objective lens system 32 shown in FIG. By replacing the second relay system 602 and the objective lens system 600 shown in FIG.
  • the paraxial angle magnifications M1 and M2 in the conditional expression (1) can be considered.
  • the objective lens system 300 shown in FIG. 7 is replaced with an optical system that is a combination of the first relay system 601 and the objective lens system 600 shown in FIG.
  • the relay system 602 and the objective lens system 600 By replacing the relay system 602 and the objective lens system 600 with a combined optical system, it can be considered in the same manner as Mpar and Mmax in the conditional expression (7).
  • Table 33 shows corresponding values of the conditional expressions (20) to (22) of the examples of the relay systems shown in Tables 28 to 31.
  • the image processing device 17 is assumed to be an ASIC (Application Specific Integrated Circuit). Note that, here, as an example of the image processing device 17, a form example realized by the ASIC is given, but the technology of the present disclosure is not limited to this.
  • the image processing device 17 may be another hardware resource such as an FPGA (Field Programmable gate Array).
  • the image processing device 17 sets a scanning range in accordance with an instruction received by the input / display device 16E.
  • the scanning range is a range set by the upper limit value and the lower limit value of the scanning angle in each of the X direction and the Y direction, for example.
  • step 502 the CPU 16A specifies the current ⁇ in. Note that ⁇ in is uniquely specified from the current scanning angle of the scanner.
  • the image processing device 17 acquires the angular magnification distribution data of the objective lens system from the lookup table, and acquires the objective lens system data at ⁇ in specified in step 502.
  • the look-up table is a table in which the angle of view is associated with the objective lens system data, that is, ⁇ in is associated with the objective lens system data, and includes information on the angular magnification distribution.
  • the angular magnification distribution data is data of angular magnification M as a function of the incident angle ⁇ in which is the scanning angle of the scanner.
  • data such as the amount of distortion as a function of ⁇ in and the amount of peripheral light as a function of ⁇ in may be acquired. Also, these data may be design data or measurement data.
  • step 506 the image processing apparatus 17 corrects the data based on the light reception result in the light receiving unit based on the angular magnification distribution data of the objective lens system acquired in step 504.
  • step 508 the image processing apparatus 17 generates an image based on the data corrected in step 506.
  • step 510 the input / display device 16E displays an image based on the data generated in step 508, and ends the present image display process.
  • the image display processing is realized by the software configuration by the CPU 16A and the hardware configuration by the image processing device 17 is illustrated, but the technology of the present disclosure is not limited to this.
  • the image display process may be executed only by a software configuration using a computer.
  • the apparatus having the functions of both the SLO system and the OCT system has been described.
  • the apparatus having only one function of the SLO system and the OCT system is configured. Is also possible.
  • the ophthalmic optical system is configured to irradiate a subject's eye with light rays from a light source,
  • the angle formed between the incident light beam incident on the ophthalmic optical system from the light source side and the optical axis of the ophthalmic optical system is ⁇ in,
  • the angle formed between the light beam emitted from the ophthalmic optical system toward the eye to be examined and the optical axis is ⁇ out,
  • M
  • M is Mpar when the incident ray is a paraxial ray and M is Mmax when the incident ray is a ray with a maximum angle of view, Mpar ⁇ Mmax
  • Appendix 5 The ophthalmic optical system according to any one of appendix 1 to appendix 4, which has a range between Mpar and Mmax in which M increases as ⁇ in increases.
  • Appendix 6 The ophthalmic optical system according to any one of appendix 1 to appendix 5, wherein the ophthalmic optical system is a refractive optical system, and ⁇ out is 50 degrees or more when the incident light beam is a light beam having a maximum angle of view.
  • the ophthalmic optical system is sequentially from the light source side, A meniscus lens component with a convex surface facing the light source, A negative lens in which the absolute value of the radius of curvature of the lens surface on the light source side is smaller than the absolute value of the radius of curvature of the lens surface on the eye side, with the concave surface facing the light source side, A positive lens in which the absolute value of the radius of curvature of the lens surface on the eye side is smaller than the absolute value of the radius of curvature of the lens surface on the light source side, with the convex surface facing the eye side to be examined.
  • Positive lens A positive lens having a convex surface facing the eye side, A cemented lens in which a positive lens and a negative lens having a convex surface facing the eye to be examined are cemented, A positive lens having a convex surface facing the light source, and The ophthalmic optical system according to any one of appendix 1 to appendix 6, including a positive meniscus lens having a concave surface directed toward the eye to be examined.
  • Appendix 8 Ophthalmic optical system according to any one of appendix 1 to appendix 7, A scanning unit, The scanning unit is disposed at a pupil conjugate position having a conjugate relation with the pupil position of the eye to be examined with respect to the ophthalmic optical system, and makes the light emitted from the light source enter the ophthalmic optical system, and the eye to be examined is the An ophthalmologic apparatus that scans the light emitted from the light source so as to be scanned by the emitted light.
  • Appendix 9 A light receiving unit that receives reflected light of the emitted light from the eye to be examined; and The ophthalmologic apparatus according to appendix 8, further comprising: an image processing apparatus that corrects data based on a light reception result in the light receiving unit based on M related to ⁇ out.
  • Appendix 10 The ophthalmologic apparatus according to appendix 9, wherein the image processing apparatus generates an image of the eye to be examined based on the corrected data.
  • the ophthalmic optical system is configured to irradiate a subject's eye with a light beam scanned at a predetermined scanning angle,
  • the maximum value of the angle formed between the luminous flux emitted from the ophthalmic optical system to the eye to be examined and the optical axis of the ophthalmic optical system is ⁇ max
  • Pmax is a beam diameter in the scanning direction of the emitted light beam at the pupil position of the eye when the angle between the emitted light beam and the optical axis is ⁇ max
  • Pmin When the light beam diameter in the scanning direction of the emitted light beam at the pupil position of the eye to be examined when the angle formed by the emitted light beam and the optical axis is the minimum is Pmin, Pmax ⁇ Pmin ⁇ 0.7 / (cos ( ⁇ max))
  • An ophthalmic optical system that satisfies the conditional expression shown in FIG.
  • the ophthalmic optical system is a refractive optical system, and an angle formed by the emitted light beam and the optical axis when the incident light beam is a light beam having a maximum angle of view is 50 degrees or more.
  • the ophthalmic optical system is configured to irradiate the eye to be inspected with a light beam from a light source,
  • the ophthalmic optical system is sequentially from the light source side,
  • a meniscus lens component with a convex surface facing the light source
  • a negative lens in which the absolute value of the radius of curvature of the lens surface on the light source side is smaller than the absolute value of the radius of curvature of the lens surface on the eye side, with the concave surface facing the light source side
  • a positive lens in which the absolute value of the radius of curvature of the lens surface on the eye side is smaller than the absolute value of the radius of curvature of the lens surface on the light source side, with the convex surface facing the eye side to be examined.
  • Positive lens A positive lens having a convex surface facing the eye side, A cemented lens in which a positive lens and a negative lens having a convex surface facing the eye side are cemented; A positive lens having a convex surface facing the light source, and
  • Appendix 16 The ophthalmic optical system according to any one of appendix 11 to appendix 15, A scanning unit, The scanning unit is arranged at a pupil conjugate position that is conjugated with the pupil position of the eye to be examined with respect to the ophthalmic optical system, causes a light beam emitted from a light source to enter the ophthalmic optical system, and the eye to be examined is the ophthalmologic An ophthalmologic apparatus that scans a light beam emitted from the light source so as to be scanned by a light beam emitted from an optical system.
  • An ophthalmic device A light source; An ophthalmic optical system that irradiates the subject's eye with light from the light source; The angle formed between the incident light beam incident on the ophthalmic optical system from the light source side and the optical axis of the ophthalmic optical system is ⁇ in, The angle formed between the light beam emitted from the ophthalmic optical system toward the eye to be examined and the optical axis is ⁇ out,
  • M
  • a first scanning unit capable of scanning the first light flux at a predetermined maximum scanning angle;
  • a first objective optical system that emits the first light beam incident from the first scanning unit to an eye to be examined and makes a conjugate relationship between the position of the first scanning unit and the pupil position of the eye to be examined;
  • a second scanning unit capable of scanning a second light beam different from the first light beam at a maximum scanning angle smaller than the maximum scanning angle of the first scanning unit;
  • a second objective optical system that emits the second light beam incident from the second scanning unit to the eye to be examined and makes a conjugate relationship between the position of the second scanning unit and the pupil position of the eye to be examined;
  • a combining unit that combines the optical path of the second light flux toward the optometry side,
  • the first objective optical system and the second objective optical system have a
  • the first objective optical system is for a scanning laser ophthalmoscope
  • the second objective optical system is for an optical coherence tomography; 1.5 ⁇
  • Appendix 20 The ophthalmologic apparatus according to appendix 18 or appendix 19, wherein a scanning speed at which the second scanning unit scans the second light beam is slower than a scanning speed at which the first scanning unit scans the first light beam.
  • the common optical system is sequentially from the synthesis unit side toward the eye to be examined.
  • a positive lens having a convex surface facing the eye side A cemented lens in which a positive lens and a negative lens having a convex surface facing the eye side are cemented;
  • a positive lens having a convex surface facing the combining portion and
  • the ophthalmologic apparatus according to any one of appendix 18 to appendix 20, including a positive meniscus lens having a concave surface facing the eye to be examined.
  • the optical system on the first scanning unit side from the combining unit is sequentially from the first scanning unit side toward the eye to be examined.
  • a meniscus lens component having a convex surface facing the first scanning unit;
  • a negative lens having a concave surface facing the first scanning unit and an absolute value of a radius of curvature of the lens surface on the first scanning unit being smaller than an absolute value of the radius of curvature of the lens surface on the eye side to be examined;
  • the ophthalmologic apparatus according to any one of appendix 18 to appendix 21, including a positive lens.
  • the optical system on the second scanning unit side from the combining unit is sequentially from the second scanning unit side toward the eye to be examined.
  • a meniscus lens component having a convex surface facing the second scanning unit;
  • a negative lens having a concave surface facing the second scanning unit side and an absolute value of a curvature radius of the lens surface on the second scanning unit side being smaller than an absolute value of the curvature radius of the lens surface on the eye side to be examined;
  • a positive lens having a convex surface facing the eye to be examined and an absolute value of the radius of curvature of the lens surface on the eye side to be examined is smaller than the absolute value of the radius of curvature of the lens surface on the side of the second scanning unit, and
  • the ophthalmologic apparatus according to any one of appendix 18 to appendix 22, including a positive lens.
  • a first scanning unit capable of scanning the first light flux at a predetermined maximum scanning angle;
  • a first objective optical system that emits the first light beam incident from the first scanning unit to an eye to be examined and makes a conjugate relationship between the position of the first scanning unit and the pupil position of the eye to be examined;
  • a second scanning unit capable of scanning a second light beam different from the first light beam at a maximum scanning angle smaller than the maximum scanning angle of the first scanning unit;
  • a second objective optical system that emits the second light beam incident from the second scanning unit to the eye to be examined and makes a conjugate relationship between the position of the second scanning unit and the pupil position of the eye to be examined;
  • a combining unit that combines the optical path of the second light flux toward the optometry side,
  • the first objective optical system and the second objective optical system have a
  • the first optical system is for a scanning laser ophthalmoscope
  • the second optical system is for an optical coherence tomography; 0.25 ⁇
  • the ophthalmologic apparatus according to supplementary note 24, which satisfies the conditional expression represented by:
  • Appendix 26 The ophthalmologic apparatus according to appendix 24 or appendix 25, wherein a scanning speed at which the second scanning unit scans the second light beam is slower than a scanning speed at which the first scanning unit scans the first light beam.
  • a first scanning unit that scans the first light flux at a predetermined scanning speed;
  • a first objective optical system that emits the first light beam incident from the first scanning unit to an eye to be examined and makes a conjugate relationship between the position of the first scanning unit and the pupil position of the eye to be examined;
  • a second scanning unit that scans a second light beam different from the first light beam at a scanning speed slower than the scanning speed of the first scanning unit;
  • a second objective optical system that emits the second light beam incident from the second scanning unit to the eye to be examined and makes a conjugate relationship between the position of the second scanning unit and the pupil position of the eye to be examined;
  • a combining unit that combines the optical path of the second light flux toward the optometry side,
  • the first objective optical system and the second objective optical system have a common optical system
  • Appendix 34 The ophthalmic optical system according to any one of appendices 28 to 33, wherein the ophthalmic optical system is a refractive optical system.
  • a meniscus lens component having a concave surface facing the eye side In order from the opposite side of the eye to be examined, A meniscus lens component having a concave surface facing the eye side, A negative lens having a concave surface facing away from the eye to be examined, A positive lens having a convex surface facing the eye side, Positive lens, A positive lens having a convex surface facing the eye side, Cemented lens,
  • Appendix 36 The ophthalmic optical system according to any one of appendices 28 to 35, and a scanning unit disposed at a position conjugate with the pupil position of the eye to be examined with respect to the ophthalmic optical system, The scanning unit causes the light beam to enter the ophthalmic optical system and scans the light beam at an angle of ⁇ in.
  • Appendix 37 37.
  • Appendix 38 A light receiving unit for receiving reflected light from the eye to be examined;
  • Appendix 39 The ophthalmologic apparatus according to appendix 38, wherein the image processing unit generates an image of the eye to be examined based on the corrected data.
  • An ophthalmic optical system configured to irradiate an angle-scanned light beam on the eye side to be examined, (1) The maximum angle formed between the light beam emitted from the ophthalmic optical system and the optical axis of the ophthalmic optical system is ⁇ max, (2) Let Pmax be the diameter of the exit beam in the meridional direction at the pupil position of the eye when the angle between the exit beam and the optical axis is ⁇ max, (3) When the diameter of the exit beam in the meridional direction at the pupil position of the eye when the angle formed by the exit beam and the optical axis is minimum is Pmin, Pmax ⁇ Pmin ⁇ 0.7 / (cos ( ⁇ max)) An ophthalmic optical system that satisfies the conditional expression shown in FIG.
  • Appendix 43 The ophthalmic optical system according to any one of appendices 40 to 42, wherein the ophthalmic optical system is a refractive optical system.
  • the ophthalmic optical system according to any one of appendices 40 to 43, and a scanning unit,
  • the scanning unit is arranged at a position conjugate with the pupil position of the eye to be examined with respect to the ophthalmic optical system,
  • the scanning unit causes a light beam to enter the ophthalmic optical system within a predetermined scanning angle range,
  • the scanning unit is an ophthalmologic apparatus that scans the light beam so as to scan the eye with the light beam emitted from the ophthalmic optical system.
  • Appendix 45 45.
  • the ophthalmologic apparatus according to appendix 44 wherein when the light beam incident on the ophthalmic optical system is a light beam having a maximum angle of view, an angle formed by the emitted light beam reaching the eye to be examined and the optical axis is 50 degrees or more.
  • An ophthalmic objective lens configured to transfer an incident light beam to an emitted light beam
  • the maximum angle formed by the emitted light beam from the ophthalmic objective lens and the optical axis is ⁇ max,
  • the diameter in the meridional direction of the emitted light beam intersecting the plane perpendicular to the optical axis at the position where the emitted light beam intersects the optical axis is expressed as Pmax.
  • the objective lens includes a front group having a positive refractive power and a rear group having a positive refractive power arranged on the eye side of the front group.
  • the front group and the rear group are separated by a maximum air space on the optical axis between lens surfaces of the objective lens,
  • the focal length of the front group is fF
  • When the focal length of the rear group is fR, 1 ⁇ fF / fR ⁇ 4 50.
  • the objective lens includes a front group having a positive refractive power and a rear group having a positive refractive power arranged on the eye side of the front group.
  • the front group and the rear group are separated by a maximum air space on the optical axis between lens surfaces of the objective lens, When the maximum air gap is D, 0.1 ⁇ D / TL ⁇ 0.5
  • the ophthalmic optical system according to appendix 49 or 50 which satisfies a conditional expression represented by:
  • the rear group includes a group A having positive refractive power and a group B having positive refractive power arranged on the eye side of the group A,
  • the A group includes at least one cemented lens having a positive refractive power, and the lens surface on the eye side of the eye to be examined most in the group A is a convex surface or a flat surface
  • the group B comprises one or more positive meniscus lens components having a concave surface facing the eye to be examined
  • the focal length of the B group is fB, When the focal length of the rear group is fR, 0.4 ⁇ fB / fR ⁇ 2.5 52.
  • the ophthalmic optical system according to supplementary note 50 or 51, which satisfies the conditional expression indicated by
  • Appendix 54 The ophthalmic optical system according to any one of appendices 49 to 53, wherein an angle formed between an emitted light beam emitted from the objective lens toward the eye to be examined and an optical axis of the objective lens is 50 degrees or more.
  • the front group includes a lens surface having a negative refractive power and a lens surface having a positive refractive power arranged on the eye side of the lens surface having the negative refractive power, according to any one of supplementary notes 50 to 53. Ophthalmic optics.
  • Appendix 56 The ophthalmic optical system according to appendix 55, wherein the front group includes a positive meniscus lens having a convex surface directed toward the eye to be examined.
  • the front group includes a negative lens and a positive lens disposed on the eye side of the negative lens, and an air lens having a negative refractive power is formed between the negative lens and the positive lens.
  • the ophthalmic optical system according to any one of appendices 50 to 52.
  • the front group includes a meniscus lens disposed on the opposite side to the subject eye side with respect to the negative lens and having a concave surface directed toward the subject eye side, and a positive lens disposed on the subject eye side of the positive lens.
  • Appendix 64 54.
  • a first scanning unit configured to emit a first scanning light beam at a first maximum scanning angle
  • a common lens group configured to form an SLO system, wherein the first scanning unit and the pupil of the eye to be examined have a first conjugate relationship, and the first scanning light beam is transmitted through the common lens group
  • a first optical system configured to emit to the eye to be examined
  • a second scanning unit configured to emit a second scanning light beam and having a second maximum scanning angle smaller than the first maximum scanning angle of the first scanning unit
  • the common lens group is configured to form an OCT system, the second scanning unit and the pupil of the eye to be examined have a second conjugate relationship, and the second scanning light beam is transmitted to the common lens group.
  • a second optical system configured to emit through the eye to be examined,
  • the optical path of the first optical system and the optical path of the second optical system are combined, and are disposed between the first scanning unit and the common lens group, and similarly, the second scanning unit and the A combining unit disposed between the common lens group and
  • An ophthalmic apparatus that satisfies the conditional expression indicated by
  • Appendix 67 The ophthalmologic apparatus according to appendix 65, wherein the second scanning unit scans the second scanning light beam at a scanning speed slower than a scanning speed at which the first scanning unit scans the first scanning light beam.
  • the common lens group is sequentially from the synthesis unit side toward the eye to be examined.
  • the ophthalmologic apparatus according to any one of appendices 65 to 67, comprising: a positive lens having a convex surface facing the synthesis unit side; and a positive meniscus lens having a concave surface facing the eye to be examined.
  • the first optical system includes a first lens group on the first scanning unit side with respect to the combining unit, The first lens group is sequentially from the first scanning unit side toward the eye to be examined.
  • a meniscus lens component having a convex surface facing the first scanning unit;
  • a negative lens having a concave surface facing the first scanning unit;
  • the ophthalmologic apparatus according to any one of supplementary notes 65 to 68, including a positive lens having a convex surface directed toward the eye to be examined and a positive lens.
  • the second optical system includes a second lens group on the second scanning unit side with respect to the combining unit, The second lens group is sequentially from the second scanning unit side toward the eye to be examined.
  • a meniscus lens component having a convex surface facing the second scanning unit;
  • a negative lens having a concave surface facing the second scanning unit;
  • the ophthalmologic apparatus according to any one of supplementary notes 65 to 69, including a positive lens having a convex surface directed toward the eye to be examined and a positive lens.
  • a first scanning unit configured to emit a first scanning light beam at a first maximum scanning angle
  • a common lens group configured to form an SLO system, wherein the first scanning unit and the pupil of the eye to be examined have a first conjugate relationship, and the first scanning light beam is transmitted through the common lens group
  • a first optical system configured to emit to the eye to be examined
  • a second scanning unit configured to emit a second scanning light beam and having a second maximum scanning angle smaller than the first maximum scanning angle of the first scanning unit
  • the common lens group is configured to form an OCT system, the second scanning unit and the pupil of the eye to be examined are in a second conjugate relationship, and the second light flux passes through the common lens group.
  • a second optical system configured to be emitted to the eye to be examined;
  • the optical path of the first optical system and the optical path of the second optical system are combined, and are disposed between the first scanning unit and the common lens group, and similarly, the second scanning unit and the A combining unit disposed between the common lens group and
  • a paraxial lateral magnification of the first optical system from the first scanning unit to the eye to be examined is ⁇ 1, (2)
  • the paraxial lateral magnification of the second optical system from the second scanning unit to the eye to be examined is ⁇ 2,
  • An ophthalmic apparatus that satisfies the conditional expression indicated by
  • Appendix 73 The ophthalmic apparatus according to appendix 71, wherein the second scanning unit scans the second scanning light beam at a scanning speed slower than a scanning speed at which the first scanning unit scans the first scanning light beam.
  • a first scanning unit configured to scan the first scanning light beam at a first scanning speed
  • a common lens group configured to form an SLO system, wherein the first scanning unit and the pupil of the eye to be examined have a first conjugate relationship, and the first scanning light beam is transmitted through the common lens group
  • a first optical system configured to emit to the eye to be examined
  • a second scanning unit configured to scan a second scanning light beam different from the first light beam at a second scanning speed slower than the first scanning speed of the first scanning unit
  • the common lens group is configured to form an OCT system, the second scanning unit and the pupil of the eye to be examined have a second conjugate relationship, and the second scanning light beam is transmitted to the common lens group.
  • a second optical system configured to emit through the eye to be examined,
  • the optical path of the first optical system and the optical path of the second optical system are combined, and are disposed between the first scanning unit and the common lens group, and similarly, the second scanning unit and the A combining unit disposed between the common lens group and
  • An ophthalmic apparatus that satisfies the conditional expression indicated by
  • a first scanning unit configured to emit a first scanning light beam in a first scanning angle range
  • the SLO system is configured to have a common lens group, the first scanning unit and the pupil of the eye to be examined have a first conjugate relationship, and the first scanning light beam is passed through the common lens group.
  • a first optical system configured to emit to the eye to be examined at an external illumination angle ⁇ 1 of 1;
  • a second scanning unit configured to emit a second scanning light beam in a second scanning angle range smaller than the first scanning angle range;
  • the common lens group is configured to form an OCT system, the second scanning unit and the pupil of the eye to be examined have a second conjugate relationship, and the second scanning light beam is transmitted to the common lens group.
  • a second optical system configured to emit to the eye to be examined at a second external illumination angle ⁇ 2 via
  • Appendix 76 The ophthalmic apparatus according to appendix 75, wherein the first external irradiation angle ⁇ 1 and the second external irradiation angle ⁇ 2 are both 100 degrees or more.
  • the first optical system includes a first relay system that forms a relay conjugate position in a third conjugate relationship with the first scanning unit in an optical path between the combining unit and the eye to be examined.
  • the ophthalmologic apparatus according to any one of appendixes 65 to 76, wherein the second optical system includes a second relay system in which the second scanning unit and the relay conjugate position are in a fourth conjugate relationship.
  • Appendix 78 A third scanning unit disposed at the relay conjugate position; The ophthalmic apparatus according to appendix 77, wherein a scanning direction of the third scanning unit is orthogonal to a scanning direction of the first scanning unit and a scanning direction of the second scanning unit.
  • the first relay system includes, in order from the first scanning unit side, a first sub lens group and a common sub lens group included in the common lens group
  • the second relay system includes, in order from the second scanning unit, a second sub lens group and the common sub lens group,
  • the combining unit is disposed between the first sub-lens group and the common sub-lens group, and among the additional notes 77 to 81 disposed between the second sub-lens group and the common sub-lens group.
  • the first relay system includes, in order from the first scanning unit side, a first sub lens group and a common sub lens group included in the common lens group,
  • the first sub lens group includes a positive meniscus lens having a concave surface facing the first scanning unit, and a meniscus lens component having a convex surface facing the first scanning unit.
  • (Appendix 85) 83 The ophthalmologic apparatus according to appendix 82, wherein the second sub lens group includes at least one positive lens and at least one negative lens, and has concave lens surfaces that are spaced apart from each other and face each other.
  • the common lens group includes the common sub-lens group and an objective lens disposed on the eye side from the relay conjugate position,
  • the objective lens in order from the relay conjugate position side, is a positive group separated from the front group by a front group having a positive refractive power and a maximum air space on the optical axis between lens surfaces of the objective lens.
  • the ophthalmic apparatus according to appendices 82 to 85, comprising a rear group having refractive power.
  • Appendix 87 The ophthalmologic apparatus according to appendix 86, wherein the front group includes a positive lens and a negative lens in order from the relay conjugate position side.
  • Appendix 88 The ophthalmologic according to appendix 86 or 87, wherein the rear group includes, in order from the relay conjugate position side, a cemented lens having a positive refractive power, a positive lens, and a positive meniscus lens having a concave surface facing the eye to be examined. apparatus.

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  • Medical Informatics (AREA)
  • Biophysics (AREA)
  • Ophthalmology & Optometry (AREA)
  • Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Physics & Mathematics (AREA)
  • Molecular Biology (AREA)
  • Surgery (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Eye Examination Apparatus (AREA)

Abstract

Cet appareil ophtalmique comprend : une première partie de balayage; un premier système optique qui forme un système SLO, a un groupe de lentilles commun, et amène la première partie de balayage et une pupille de l'œil d'un sujet à se trouver dans une première relation conjuguée; une seconde partie de balayage qui a un angle de balayage maximal qui est inférieur à un angle de balayage maximal de la première partie de balayage; un second système optique qui forme un système OCT, a un groupe de lentilles commun, et amène la seconde partie de balayage et la pupille de l'œil du sujet à se trouver dans une seconde relation conjuguée; et une partie de combinaison qui combine un trajet optique du premier système optique et un trajet optique du second système optique. L'appareil ophtalmique satisfait une condition |M1|<|M2| qui concerne un grandissement angulaire paraxial M1 du premier système optique et un grandissement angulaire paraxial M2 du second système optique.
PCT/JP2019/012942 2018-03-30 2019-03-26 Appareil ophtalmique WO2019189223A1 (fr)

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JP2021058597A (ja) * 2019-10-07 2021-04-15 オプトス ピーエルシー 眼科走査システム及び方法

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US20080024721A1 (en) * 2006-07-27 2008-01-31 Nidek Co., Ltd. Ophthalmic photographing apparatus
JP2014213156A (ja) * 2013-04-30 2014-11-17 キヤノン株式会社 光断層撮像装置
JP2016104105A (ja) * 2014-12-01 2016-06-09 株式会社ニデック 眼科撮影装置
JP2017029483A (ja) * 2015-08-03 2017-02-09 株式会社ニデック 眼科撮影装置

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Publication number Priority date Publication date Assignee Title
US20080024721A1 (en) * 2006-07-27 2008-01-31 Nidek Co., Ltd. Ophthalmic photographing apparatus
JP2008029467A (ja) * 2006-07-27 2008-02-14 Nidek Co Ltd 眼科撮影装置
JP2014213156A (ja) * 2013-04-30 2014-11-17 キヤノン株式会社 光断層撮像装置
JP2016104105A (ja) * 2014-12-01 2016-06-09 株式会社ニデック 眼科撮影装置
JP2017029483A (ja) * 2015-08-03 2017-02-09 株式会社ニデック 眼科撮影装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021058597A (ja) * 2019-10-07 2021-04-15 オプトス ピーエルシー 眼科走査システム及び方法
US11426072B2 (en) 2019-10-07 2022-08-30 Optos Plc Ophthalmic scanning system and method
JP7251027B2 (ja) 2019-10-07 2023-04-04 オプトス ピーエルシー 眼科走査システム及び方法

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