JP2020049129A - Ophthalmologic device - Google Patents

Abstract

To provide an ophthalmologic device capable of suitably measuring the shape of a cornea.SOLUTION: The ophthalmologic device for measuring an eye to be inspected comprises: a first projection system for projecting a first pattern index onto the eye to be inspected; a second projection system for projecting a second pattern index through an objective lens to the eye to be inspected; an anterior eye observation system which photographs an anterior eye part of the eye to be inspected through an opening provided in the first projection system; and one or more measurement optical systems which are different from the second projection system and the anterior eye observation system.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to an ophthalmologic apparatus that tests an eye to be inspected.

  2. Description of the Related Art An ophthalmologic apparatus that measures a corneal shape by projecting a large number of ring patterns on a cornea of an eye to be examined and photographing an index image formed on the cornea is known (see Patent Literature 1).

  In a conventional apparatus, a ring pattern is projected onto a cornea of a subject by, for example, illuminating a placid plate in which a ring-shaped light-transmitting portion and a light-shielding portion (mask portion) are alternately and concentrically formed by a plurality of light sources from behind. It is done by doing.

JP-A-7-194550

  However, when using the conventional method, it was difficult to measure the shape of the central portion of the cornea.

  The present disclosure has been made in consideration of the conventional problems, and has as its technical object to provide an ophthalmologic apparatus that can appropriately measure a corneal shape.

  In order to solve the above problem, the present disclosure is characterized by including the following configuration.

  (1) An ophthalmologic apparatus for measuring an eye to be examined, a first projection system for projecting a first pattern index onto the eye to be inspected, and a second projection for projecting a second pattern index onto the eye to be examined via an objective lens. A system, an anterior eye observation system for photographing the anterior segment of the eye through an opening provided in the first projection system, and one or more different measurements from the second projection system and the anterior eye observation system And an optical system.

FIG. 3 is a schematic diagram illustrating an internal configuration of the ophthalmologic apparatus according to the first embodiment. FIG. 3 is a diagram showing a part of an internal placid optical system. It is a figure showing a part of external placido optical system. It is a figure showing an example of an anterior segment image. It is the schematic which shows the internal structure of the ophthalmologic apparatus in 2nd Example. It is the schematic which shows the internal structure of the ophthalmologic apparatus in 3rd Example. It is the schematic which shows the internal structure of the ophthalmologic apparatus in the modification of 3rd Example.

<Embodiment>
Hereinafter, embodiments according to the present disclosure will be described. The ophthalmologic apparatus of this embodiment (for example, ophthalmologic apparatuses 1 to 3) measures an eye to be examined. The ophthalmologic apparatus includes, for example, a first projection system (for example, the external Placido optical system 50), a second projection system (for example, the internal Placido optical system 30), and an anterior eye observation system (for example, the anterior eye observation system 20). , A measurement optical system (for example, the OCT optical system 40).

  The first projection system projects a first pattern index (for example, pattern index Q1) onto the eye to be examined. The first projection system projects, for example, a first pattern index on the cornea of the subject's eye. The first pattern index is, for example, an index for measuring a corneal shape. The first projection system projects, for example, the first pattern index onto a region excluding a central portion of the cornea (for example, a region including a vertex of the cornea). The second projection system projects a second pattern index (for example, a pattern index Q2) onto the subject's eye via an objective lens. The second projection system projects, for example, a second pattern index on the cornea of the eye to be inspected. The second pattern index is, for example, an index for measuring a corneal shape. The second projection system projects, for example, the second pattern index at a position where the first pattern index is not projected on the eye to be inspected. For example, the second projection system projects the second pattern index on the central part of the cornea. The first pattern index and the second pattern index may be, for example, a placido ring pattern or a dot pattern. The anterior eye observation system captures an image of the anterior eye of the subject's eye through an opening (for example, the opening 55) provided in the first projection system. The measurement optical system is an optical system different from the second projection system and the anterior eye observation system. The ophthalmic apparatus includes at least one measurement optical system.

  The ophthalmologic apparatus may further include a first split mirror (for example, split mirror 11). The first split mirror is arranged, for example, closer to the subject's eye (outside) than the objective lens (for example, the lens 15). The first split mirror may split the anterior eye observation system and the second projection system and the measurement optical system. Accordingly, the second projection system and the anterior ocular observation system become an optical system that does not share a lens, and it is possible to prevent ghost light derived from lens reflection from being reflected in an anterior ocular segment image. Further, the second projection system and the measurement optical system may share some optical elements. This makes it possible to reduce the number of lenses or to make the apparatus compact. For example, the second projection system and the measurement optical system may share an objective lens (for example, the lens 15) disposed before branching of both systems. This can prevent the optical system after the objective lens (for example, a second branching mirror described later) from being enlarged. The second projection system can project a pattern index having a higher image height.

  The first split mirror may split the second projection system and the anterior eye observation system and the measurement optical system. By branching the second projection system first, the working distance (working distance) of the second projection system can be shortened, and the size of the optical system in the subsequent stage can be reduced. In addition, since the lens is not shared with the anterior ocular observation system, it is possible to prevent ghost light derived from lens reflection from being reflected in the anterior ocular segment image.

  Note that the first split mirror may split the measurement optical system, the anterior eye observation system, and the second projection system. By immediately branching the measuring optical system, the working distance of the measuring optical system can be shortened. In this case, the ophthalmologic apparatus may include an annular lens (for example, the annular lens 16 or the annular lens 17). The annular lens is, for example, a perforated lens, a ring lens, or the like, and is an annular lens having a cavity (cavities 16a and 17a) formed in the center. The annular lens is arranged, for example, in the second projection system. Since the optical path of the anterior eye observation system passes through the cavity, the second projection system and the anterior eye observation system are optical systems that do not share a lens, and ghost light derived from lens reflection can be prevented from being reflected in the anterior eye image. .

  The ophthalmologic apparatus may further include a second split mirror (for example, split mirror 12). The second split mirror further splits, for example, the optical system split by the first split mirror. For example, when the measurement optical system and the anterior eye observation system and the second projection system are branched by the first branch mirror, the second branch mirror branches the anterior eye observation system and the second projection system. In this case, the annular lens may be arranged between the first split mirror and the second split mirror, or may be arranged closer to the eye to be examined than the first split mirror. In the latter case, the size of the annular lens can be reduced.

  Note that the measurement optical system may be an interference optical system (for example, the OCT optical system 40) that detects an interference state between the measurement light reflected by the subject's eye and the reference light corresponding to the measurement light. In this case, the ophthalmic apparatus measures not only the corneal shape, but also the measurement of the axial length using an interference optical system, a detailed three-dimensional shape analysis including the back surface of the cornea based on an anterior ocular segment image, or the axial length in consideration of a fundus disease. Analysis such as measurement is possible. Note that the measurement optical system may be an aberration measurement optical system that measures the aberration of the subject's eye.

<Example>
Hereinafter, an ophthalmologic apparatus 1 according to the present disclosure will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram illustrating an internal configuration of the ophthalmologic apparatus 1 according to the present embodiment. The following optical system is built in a housing (not shown). In addition, the housing is three-dimensionally moved with respect to the eye E through an operation member (for example, a touch panel, a joystick, or the like) by driving a well-known alignment moving mechanism. In the following description, the direction of the optical axis of the subject's eye E will be described as the Z direction, the horizontal direction as the X direction, and the vertical direction as the Y direction.

  The ophthalmologic apparatus 1 according to the present embodiment mainly includes, for example, a branch mirror 11, a branch mirror 12, a lens 15, an anterior eye observation system 20, an internal Placid optical system 30, an OCT optical system 40, and the like. The split mirror 11 and the split mirror 12 split the optical path of each optical system. The lens 15 is shared by the internal placid optical system 30 and the OCT optical system 40. The anterior eye observation system 20 captures, for example, the anterior eye part of the subject's eye. The internal placid optical system 30 projects a pattern index onto the eye E through an objective lens. The OCT optical system 40 is used for measuring the axial length of the eye E to be examined.

<Anterior eye observation system>
The anterior eye observation system 20 captures an anterior eye part front image. The anterior eye observation system 20 includes a lens 21, a lens 22, a light receiving element 23, and the like. The lens 21 is an objective lens of the anterior ocular observation system 20. The light receiving element 23 is disposed at a position substantially conjugate with the anterior segment of the subject's eye. The output signal from the light receiving element 23 is used for observing the anterior segment of the eye, photographing a pattern index (for example, a Placido ring pattern) projected on the cornea, and the like. In this case, the reflected light from the subject's eye is received by the light receiving element 23 via the lens 21 and the lens 22.

<Internal Placid optical system>
The internal placid optical system 30 projects the pattern index through the lens 15 onto the cornea of the subject's eye. The internal placid optical system 30 includes, for example, a light source 31, a lens 32, an index plate 33, a lens 34, and a lens 35. The light source 31 emits, for example, visible light. The index plate 33 uses light from the light source 31 as pattern index light. As shown in FIG. 2, the index plate 33 is formed with a light shielding portion 33a and a light transmitting portion 33b. The light shielding part 33a shields light from the light source 31. The light transmitting portion 33b transmits light from the light source 31. On the index plate 33, for example, a concentric ring pattern (a placido ring pattern) as shown in FIG. 2 is formed. When light from the light source 31 passes through the ring-shaped light transmitting portion 33b, the light becomes a ring-shaped pattern index light, and is projected onto the eye to be examined.

  The light from the light source 31 passes through the lens 32, the index plate 33, the lens 34, and the lens 35, and is reflected by the branch mirror 12 in the direction of the optical axis O1. The light reflected by the split mirror 12 passes through the lens 15 and passes through the split mirror 11, and travels toward the subject's eye.

  The internal placid optical system 30 of the present embodiment also serves as a fixation target projection optical system. Therefore, the internal platinum optical system 30 can fixate the subject by irradiating the subject with the index light from the light source 31. The fixation lamp may be branched by the anterior eye observation system 20 to form a dedicated system, similarly, may be branched by the internal platinum optical system 30, or may be branched by the OCT optical system 40. Good.

<OCT optical system>
The OCT optical system 40 irradiates the eye E with measurement light. The OCT optical system 40 detects an interference state between the measurement light reflected from each part (for example, cornea, crystalline lens, fundus, etc.) of the eye to be inspected and the reference light by a detector (light receiving element) 45.

  The OCT optical system 40 has a configuration of a so-called optical coherence tomography (OCT) for ophthalmology. The OCT optical system 40 divides the light emitted from the light source 41 into measurement light (sample light) and reference light by a coupler (light splitter) 42. Then, the OCT optical system 40 guides the measurement light to the subject's eye and guides the reference light to the reference optical system 45. Thereafter, the detector 46 receives the interference light resulting from the synthesis of the measurement light reflected by each part of the eye to be examined and the reference light.

  The light emitted from the light source 41 is split by the coupler 42 into a measurement light beam and a reference light beam. Then, the measurement light beam is emitted into the air after passing through the optical fiber. The luminous flux is applied to the subject's eye via the lens 43, the lens 44, the lens 15, and the like. Then, the light reflected by each part of the eye to be examined returns to the optical fiber via the same optical path.

  The reference optical system 45 generates reference light that is combined with reflected light obtained by reflection of the measurement light on the eye E. The reference optical system 45 may be a Michelson type or a Mach-Zehnder type. The reference optical system 45 is formed by, for example, a reflection optical system (for example, a reference mirror), reflects light from the coupler 42 back to the coupler 42 by reflecting the light from the reflection optical system, and guides the light to the detector 46. As another example, the reference optical system 45 is formed by a transmission optical system (for example, an optical fiber), and guides the light from the coupler 42 to the detector 46 by transmitting the light without returning it.

  The reference optical system 45 has a configuration that changes an optical path length difference between the measurement light and the reference light by moving an optical member in the reference light path. For example, the reference mirror is moved in the optical axis direction.

  The detector 46 detects an interference state between the measurement light and the reference light. In the case of Fourier domain OCT, the spectral intensity of the interference light is detected by the detector 46, and a depth profile (A-scan signal) in a predetermined range is obtained by Fourier transform of the spectral intensity data.

  For example, the Fourier domain OCT includes Spectral-domain OCT (SD-OCT) and Swept-source OCT (SS-OCT). Further, it may be Time-domain OCT (TD-OCT).

  In the case of SD-OCT, a low coherent light source (broadband light source) is used as the light source 41, and the detector 46 is provided with a spectral optical system (spectrum meter) that splits the interference light into each frequency component (each wavelength component). . The spectrum meter includes, for example, a diffraction grating and a line sensor.

  In the case of SS-OCT, a wavelength scanning type light source (variable wavelength light source) that changes the emission wavelength at high speed over time is used as the light source 41, and a single light receiving element is provided as the detector 41, for example. The light source 41 includes, for example, a light source, a fiber ring resonator, and a wavelength selection filter. Examples of the wavelength selection filter include a combination of a diffraction grating and a polygon mirror, and a filter using a Fabry-Perot etalon.

<External Placid Optical System>
The external placid optical system 50 projects a pattern index (for example, a placido ring pattern) on the eye to be examined. The external Placido optical system 50 includes, for example, a light source 51, a light guide plate 52, a Placido plate 53, and the like. The external placid optical system 50 is disposed around the optical axis O1.

  The light source 51 is, for example, an LED that emits infrared light or visible light. A plurality of light sources 51 are arranged behind the light guide plate 52. That is, the light source 51 is arranged in a ring shape behind the light guide plate 52. The light guide plate 52 is, for example, a translucent plate. As the material, for example, a transparent resin such as an acrylic resin is used. The placid plate 53 is arranged on the front surface of the light guide plate 52. The placido plate 53 has, for example, a placido ring pattern formed on a translucent plate. For example, on the placid plate 53, as shown in FIG. 3, a large number of light-shielding portions 53a painted black and light-transmitting portions 53b not painted are alternately formed concentrically around the optical axis O1.

  Light emitted from the light source 51 enters the inside of the light guide plate 52 from the rear surface, and is emitted from the front surface of the light guide plate 52 while diffusing. The light emitted from the light guide plate 52 illuminates the placid plate 53 from behind, and the light transmitted through the translucent portion 53b projects a placido ring pattern on the subject's eye.

  As shown in FIG. 3, the light guide plate 52 of this embodiment has ten holes in addition to the openings 55. The two elongated holes 54 in the horizontal direction are holes for the optical path of the working distance detector 40, and the remaining holes are fitted with LEDs for anterior ocular segment illumination.

<Working distance detector>
The working distance detector 60 includes, for example, a light projecting system and a light receiving system. The light projection system includes a light source 61 that emits infrared light and a lens 62. The light receiving system includes a lens 63 and a light receiving element 64. The light from the light source 61 is converted into a substantially parallel light beam by the lens 62, and is emitted from the oblique direction to the cornea of the eye E through a long hole 54 provided in the light guide plate 52 and the platinum plate 53. The light receiving optical axis of the light receiving system is provided so as to be symmetric with respect to the optical axis O1 with respect to the light emitting optical axis of the light projecting system, and the corneal reflection light from the light source 61 is received through the long hole 54 and the lens 63. The light enters the element 64. When the eye E moves relatively in the front-rear direction (optical axis direction), the index image formed on the cornea of the eye also moves on the light receiving element. Can be detected.

<Optical arrangement>
Next, the optical arrangement of the first embodiment will be described. In the first embodiment, as shown in FIG. 1, an anterior eye observation system 20, an internal placid optical system 30, and an OCT optical system 40 are branched by a branch mirror 11 disposed on the side of the eye to be examined. In the example of FIG. 1, the anterior eye observation system 20 is disposed on the reflection side of the split mirror 11, and the internal platinum optical system 30 and the OCT optical system 40 are disposed on the transmission side. Further, a lens 15 is disposed on the transmission side of the split mirror 11. The lens 15 is shared by the internal placid optical system 30 and the OCT optical system 40. The lens 15 serves as an objective lens for the internal platinum optical system 30 and the OCT optical system 40, and has a role as a field lens for the internal platinum optical system 30. The field lens is, for example, a lens that controls the principal ray angle of the peripheral visual field. The internal placid optical system 30 and the OCT optical system 40 are split by the split mirror 12. Since axial astigmatism occurs at the stage of transmission through the branch mirror 11, a cylindrical lens is disposed on the transmission side of the branch mirror 11, or a window (transparent plate or the like) tilted in the direction opposite to the branch mirror 11. May be canceled by arranging. Of course, if the degree of ass is small, it is not necessary to arrange them. For example, if a prism is used as the split mirror, astigmatism is reduced.

<Control unit>
Next, the control system will be described. The control unit 70 controls the entire apparatus and calculates a measurement result. The control unit 70 is connected to each light source and each light receiving element of the optical system, the monitor 71, the operation unit 72, the memory 73, and the like. Note that the memory 73 stores various control programs, an IOL frequency calculation program, and the like.

<Control operation>
Hereinafter, the control operation of the present apparatus will be described. First, the control unit 70 performs alignment with respect to the subject's eye. At the time of alignment, the control unit 70 turns on the light source 31, the light source 51, and the light source 61. The control unit 70 captures an anterior eye image of the eye to be inspected by the anterior eye observation system 20 and performs alignment of the apparatus with the eye in the XY directions based on the acquired anterior eye image. For example, the control unit 70 detects a pattern index appearing in the anterior ocular segment image, and performs alignment in the XY directions such that the center of the pattern index is located at the center of the anterior ocular segment image. Further, the control unit 70 performs alignment in the Z direction based on the detection result of the working distance detection unit 60.

  When the alignment with respect to the anterior segment is completed, the control unit 70 captures an anterior segment image using the anterior segment observation system 20. As shown in FIG. 4, the anterior segment image P includes a pattern index Q1 projected by the external Placido optical system 50 and a pattern index Q2 projected by the internal Placido optical system 30. Further, the control unit 70 acquires an A-scan signal using the OCT optical system 40. The acquired anterior eye image and the A-scan signal are stored in the memory 73 and the like.

  Subsequently, the control unit 70 acquires eye shape parameters. For example, the control unit 70 calculates the corneal shape of the subject's eye based on the pattern indexes Q1 and Q2 in the anterior segment image P stored in the memory 73. Further, the control unit 70 analyzes the A-scan signal acquired by using the OCT optical system 40. For example, the control unit 70 detects the positions of the cornea, the lens, the retina, and the like based on the peak position of the A-scan signal, and measures the corneal thickness, the anterior chamber depth, the lens thickness, the axial length, and the like based on the positions. I do. The acquired eye shape parameters are stored in, for example, the memory 73 and displayed on the monitor 71 and the like.

  As described above, in the ophthalmologic apparatus 1 of the first embodiment, the optical paths of the anterior eye observation system 20, the internal Placido optical system 30, and the OCT optical system 40 are branched by the branch mirror 11 and the branch mirror 12. Further, the anterior eye observation system 20 and the internal placid optical system 30 do not share an objective lens, and each have an objective lens. With such a configuration, it is possible to prevent the index light of the internal placido optical system 30 reflected by the objective lens from being reflected in the anterior ocular segment image P captured by the anterior ocular observation system 20. Therefore, the anterior ocular observation system 20 can satisfactorily photograph the pattern index projected on the central part of the cornea (near the optical axis O1) by the internal placido optical system 30.

  In the case where the OCT optical system 40 is provided as in the first embodiment, the image height of the pattern index Q1 projected by the external platinum optical system 50 is increased to shorten the working distance as much as possible, and the shape information of the central portion of the cornea is obtained. It will be difficult to get. Even in such a case, by adopting the configuration as in the above embodiment, it is possible to obtain the shape of the central portion of the cornea by analyzing the pattern index Q2 in a state in which the occurrence of ghost light due to objective reflection is suppressed. it can. In particular, even when the OCT optical system 40 does not include a scanner (scanning unit) that scans the measurement light and cannot capture a two-dimensional cross-sectional image of the anterior eye, the corneal shape at the central portion of the cornea can be easily measured. can do.

  Further, the ophthalmologic apparatus 1 according to the first embodiment can project the pattern index Q2 having a high image height onto the cornea without increasing the size of the internal platinum optical system 30 by arranging the lens 15; Opening 55 can be enlarged to widen the field of view of the anterior segment image and the like.

<Second embodiment>
Next, a second embodiment will be described. The ophthalmologic apparatus 2 of the second embodiment differs from the first embodiment in the optical arrangement. Hereinafter, points different from the first embodiment will be mainly described, and the same components will be denoted by the same reference numerals and description thereof will be omitted.

  In the ophthalmologic apparatus 2 of the second embodiment, as shown in FIG. 5, the internal placid optical system 30 and the anterior ocular observation system 20 and the OCT optical system 40 are branched by the branch mirror 11 arranged on the eye to be examined. You. In the example of FIG. 5, the internal placid optical system 30 is arranged on the reflection side of the branch mirror 11, and the anterior eye observation system 20 and the OCT optical system 40 are arranged on the transmission side of the branch mirror 11. In the second embodiment, since the internal placido optical system 30 is arranged near the eye to be inspected, a field lens becomes unnecessary, and the optical system is simplified. Note that a lens shared by the anterior eye observation system 20 and the OCT optical system 40 may be provided between the branch mirror 11 and the branch mirror 12.

<Third embodiment>
A third embodiment will be described. The ophthalmologic apparatus 3 of the third embodiment differs from the ophthalmic apparatuses 1 and 2 of the first and second embodiments in optical arrangement. Hereinafter, points different from the first and second embodiments will be mainly described, and the same components will be denoted by the same reference numerals and description thereof will be omitted.

  In the ophthalmologic apparatus 3 of the third embodiment, as shown in FIG. 6, the OCT optical system 40, the anterior ocular observation system 20, and the internal Placido optical system 30 are branched by the branch mirror 11 arranged on the side of the subject's eye. You. In the example of FIG. 6, the OCT optical system 40 is arranged on the reflection side of the split mirror 11, and the anterior eye observation system 20 and the internal Placido optical system 30 are arranged on the transmission side. Further, an annular lens 16 is disposed on the transmission side of the split mirror 11. The annular lens 16 is, for example, a perforated lens or a ring lens having a hollow portion 16a formed in a central portion. The annular lens 16 becomes a field lens of the internal platinum optical system 30. The light received by the anterior eye observation system 20 passes through the hollow portion 16a of the perforated lens 16, and reaches the branch mirror 12 without being refracted. As described above, by branching from the OCT optical system 40 first, the working distance of the OCT optical 40 can be shortened. Further, the index light of the internal platinum optical system 30 can be refracted by the annular lens 16 without causing objective reflection.

<Transformation example>
Next, a modification of the third embodiment will be described. In the ophthalmologic apparatus 3a of this modification, as shown in FIG. 7, an annular lens 17 is arranged on the side of the subject's eye (outside) with respect to the branch mirror 11 instead of the annular lens 16 of the third embodiment. The annular lens 17 serves as a field lens of the internal platinum optical system 30. The light received by the anterior eye observation system 20 or the OCT optical system 40 passes through the cavity 17a of the annular lens 17 and reaches the branch mirror 11 or 12 without being refracted. In the ophthalmologic apparatus 3a of this modification, in addition to the effects of the third embodiment, the size of the annular lens can be reduced because the annular lens can be arranged near the eye to be examined.

  In the first to third embodiments described above, the optical arrangements of the split mirror 11 and the split mirror 12 on the transmission side and the reflection side may be reversed. For example, in the case of the first embodiment, the internal placid optical system 30 and the OCT optical system 40 may be arranged on the reflection side of the split mirror 11, and the anterior eye observation system 20 may be arranged on the transmission side. Further, the OCT optical system 40 may be arranged on the reflection side of the splitting mirror 12, and the internal Placido optical system 30 may be arranged on the transmission side.

  The split mirrors 11 and 12 may be plate-shaped mirrors or prism-shaped mirrors. Further, the split mirrors 11 and 12 may be dichroic mirrors or polarization beam splitters (PBS).

  In the above embodiments, the ophthalmologic apparatuses 1 to 3 include the OCT optical system 40, but may include an aberration measuring optical system including a Shack-Hartmann wavefront sensor or the like, or other optical systems. The technology of the present disclosure is applied to a case where three or more optical systems including the anterior eye observation system 20 and the internal placid optical system 30 are provided.

Reference Signs List 1 ophthalmic apparatus 2 ophthalmic apparatus 3 ophthalmic apparatus 3a ophthalmic apparatus 11 branch mirror 12 branch mirror 15 objective lens 16 annular lens 16a cavity 17 annular lens 17a cavity 20 anterior ocular observation system 21 lens 22 lens 23 light receiving element 30 internal platinum optical system REFERENCE SIGNS LIST 31 light source 32 lens 33 index plate 34 lens 35 lens 40 OCT optical system 41 light source 42 coupler 43 lens 44 lens 45 reference optical system 46 detector 50 external placid optical system 51 light source 52 index plate 55 opening 60 working distance detection system 61 light source 62 lens 63 lens 64 light receiving element 70 control unit P anterior ocular segment image Q1 pattern index Q2 pattern index

Claims (10)

An ophthalmic apparatus that measures an eye to be examined,
A first projection system that projects a first pattern index onto the subject's eye;
A second projection system that projects a second pattern index onto the eye to be examined via an objective lens;
An anterior eye observation system for photographing an anterior eye of the eye through an opening provided in the first projection system;
One or more measurement optical systems different from the second projection system and the anterior eye observation system,
An ophthalmologic apparatus comprising:   The ophthalmologic apparatus according to claim 1, wherein the measurement optical system is an interference optical system that detects an interference state between the measurement light reflected by the eye to be inspected and a reference light corresponding to the measurement light. The apparatus further includes a first split mirror disposed closer to the subject's eye than the objective lens,
The ophthalmologic apparatus according to claim 1, wherein the first branch mirror branches the anterior eye observation system, the second projection system, and the measurement optical system.   The ophthalmologic apparatus according to any one of claims 1 to 3, wherein the second projection system and the measurement optical system share some optical elements.   The ophthalmologic apparatus according to claim 4, wherein the second projection system and the measurement optical system share the objective lens.   The ophthalmologic apparatus according to claim 1, further comprising a first split mirror that splits the second projection system, the anterior eye observation system, and the measurement optical system.   The ophthalmologic apparatus according to claim 1, further comprising a first branch mirror that branches the measurement optical system, the anterior eye observation system, and the second projection system. An annular lens disposed in the second projection system and having a hollow portion formed in the center;
The ophthalmologic apparatus according to claim 7, wherein an optical path of the anterior eye observation system passes through the cavity. A second splitting mirror for splitting the anterior eye observation system and the second projection system,
The ophthalmologic apparatus according to claim 8, wherein the annular lens is disposed between the first split mirror and the second split mirror. The ophthalmologic apparatus according to claim 8, wherein the annular lens is disposed closer to the subject's eye than the first split mirror.

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