JP2019013803A - Ophthalmic surgical microscope and ophthalmic surgical attachment - Google Patents

Abstract

To provide an ophthalmic surgical microscope and an ophthalmic surgical attachment with which an OCT examination with a wide area and high resolution is possible in a compact configuration.SOLUTION: The ophthalmic surgical microscope concerning the embodiment comprises: an objective lens; a diaphragm irradiated with light containing visible light from a light source for illumination; a lens unit having one or more lenses for making the light having passed through the diaphragm into a parallel optical flux; an illumination system for irradiating a subject eye with the light having passed through the lens unit through the objective lens; an observation system for observing the subject eye illuminated by the illumination system through the objective lens; an OCT system for inspecting the subject eye by a light coherence tomography through the objective lens; and an optical path coupling member disposed between the diaphragm and the lens unit and connecting the optical path of the OCT system to the optical path of the illumination system.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a microscope for ophthalmic surgery and an attachment for ophthalmic surgery.

  Various operations are performed in the ophthalmology field. Typical examples include cataract surgery and retinal vitreous surgery. In such an operation, an ophthalmic surgical microscope is used. The microscope for ophthalmologic surgery is used for observing the subject's eye illuminated by the illumination system with the naked eye or taking an image through the observation system.

  Some microscopes for ophthalmic surgery are equipped with an optical coherence tomography (hereinafter referred to as OCT) apparatus (see, for example, Patent Documents 1 to 5). The OCT apparatus is used for acquisition of cross-sectional images and three-dimensional images, measurement of tissue size (layer thickness, etc.), acquisition of functional information (blood flow information, etc.), and the like.

  Specifications required for such an OCT apparatus include high resolution, a sufficiently strong OCT signal, a wide scan range, and a compact configuration. In order to satisfy these specifications, the position where the OCT optical path is coupled to the optical path of the ophthalmic surgical microscope is important.

  In the surgical microscopes disclosed in Patent Documents 1 to 4, the OCT optical path is coupled to the observation optical path. In the surgical microscope disclosed in Patent Document 5, the OCT optical path is coupled to the illumination optical path, and these optical paths are coupled to the observation optical path.

JP 2008-264488 A JP 2008-264490 A JP 2008-268852 A JP 2009-230141 A JP 2008-264489 A

  The configuration in which the OCT optical path is coupled to the observation optical path as in Patent Documents 1 to 4 has a problem that sufficient resolution cannot be obtained due to the limitation of the diameter of the lens disposed in the observation optical path. In order to avoid this problem, a configuration in which the OCT optical path is coupled to the observation optical path at a position between the objective lens and the eye to be examined is also conceivable. The problem of becoming. Further, in the configuration disclosed in Patent Document 5, the illumination optical path and the OCT optical path are coupled at a position between lenses constituting a lens group (lens unit) for converting illumination light into a parallel light beam. There is a problem that the design becomes complicated and it becomes difficult to make the surgical microscope compact and to modularize the OCT apparatus that can be attached to the surgical microscope.

  The present invention has been made to solve such problems, and an object thereof is to provide an ophthalmic surgical microscope and an ophthalmic surgical attachment capable of performing a wide-range and high-resolution OCT examination with a compact configuration. It is in.

The microscope for ophthalmic surgery according to the embodiment includes an objective lens, a diaphragm that is irradiated with light including visible light from an illumination light source, and a lens unit that includes one or more lenses that convert the light that has passed through the diaphragm into parallel light fluxes. An illumination system that irradiates the eye to be examined with light passing through the lens unit via the objective lens, an observation system for observing the eye to be examined illuminated by the illumination system via the objective lens, and optical coherence tomography And an optical path that is arranged between the diaphragm and the lens unit or between the lens unit and the objective lens, and couples the optical path of the OCT system to the optical path of the illumination system. A coupling member.
The ophthalmic surgical attachment according to the embodiment includes an objective lens, a diaphragm that is irradiated with light including visible light from an illumination light source, and a lens unit that includes one or more lenses that convert the light that has passed through the diaphragm into parallel light fluxes. Including an illumination system that irradiates the eye to be examined with light passing through the lens unit via the objective lens, and an observation system for observing the eye to be examined illuminated by the illumination system via the objective lens An attachment for ophthalmic surgery that is configured to be detachable from a microscope and that examines an eye to be examined through an objective lens by optical coherence tomography, and is obtained by dividing light from an OCT light source And the reference light and the interference optical system that generates interference light by causing the reference light and the return light of the measurement light from the eye to interfere with each other. A collimating lens that converts the measured light into a parallel light beam, an optical scanner that deflects the measurement light that has been converted into a parallel light beam by the collimating lens, an OCT lens through which the measurement light deflected by the optical scanner passes, and an OCT lens An optical path coupling member for coupling the optical path of the measurement light that has passed through the optical path of the illumination system, and when the optical path coupling member is attached to the microscope for ophthalmic surgery, the optical path coupling member is between the diaphragm and the lens unit or the lens unit. And the objective lens.

  According to the ophthalmic surgical microscope and the ophthalmic surgical attachment according to the present invention, a wide range and high resolution OCT inspection can be performed with a compact configuration.

Schematic which shows the structural example of the optical system of the microscope for ophthalmologic surgery which concerns on embodiment. Schematic which shows the structural example of the optical system of the microscope for ophthalmologic surgery which concerns on embodiment. Schematic which shows the structural example of the optical system of the microscope for ophthalmologic surgery which concerns on embodiment. Explanatory drawing of operation | movement of the microscope for ophthalmologic surgery which concerns on embodiment. Explanatory drawing of operation | movement of the microscope for ophthalmologic surgery which concerns on embodiment. Explanatory drawing of operation | movement of the microscope for ophthalmologic surgery which concerns on embodiment. Explanatory drawing of operation | movement of the microscope for ophthalmologic surgery which concerns on embodiment. Schematic which shows the structural example of the optical system of the microscope for ophthalmologic surgery which concerns on embodiment. Schematic which shows the structural example of the optical system of the microscope for ophthalmologic surgery which concerns on embodiment. Explanatory drawing of operation | movement of the microscope for ophthalmologic surgery which concerns on embodiment. Explanatory drawing of operation | movement of the microscope for ophthalmologic surgery which concerns on embodiment. Schematic which shows the structural example of the optical system of the microscope for ophthalmologic surgery which concerns on embodiment. Schematic which shows the structural example of the optical system of the microscope for ophthalmologic surgery which concerns on embodiment. Schematic which shows the structural example of the optical system of the microscope for ophthalmologic surgery which concerns on embodiment. Explanatory drawing of operation | movement of the microscope for ophthalmologic surgery which concerns on embodiment. Explanatory drawing of operation | movement of the microscope for ophthalmologic surgery which concerns on embodiment.

  An example of an embodiment of an ophthalmic surgical microscope and an ophthalmic surgical attachment according to the present invention will be described in detail with reference to the drawings. The microscope for ophthalmic surgery according to the following embodiment is used in ophthalmic surgery. The microscope for ophthalmologic surgery according to the embodiment is an apparatus that acquires an observation image of the eye to be examined by illuminating the eye to be examined (patient eye) with an illumination system and causing the return light to enter the observation system. The ophthalmic surgical attachment is configured to be detachable from the ophthalmic surgical microscope.

  The ophthalmic surgical microscope according to the following embodiment can perform an OCT examination in a state in which an ophthalmic surgical attachment including at least a part of the OCT optical system is mounted. In this specification, the OCT examination includes acquisition of cross-sectional images and three-dimensional images, measurement of tissue size (layer thickness and the like), acquisition of functional information (blood flow information and the like), and the like. The site to be examined by OCT may be any part of the eye to be examined. For example, the anterior segment may be the cornea, the vitreous body, the crystalline lens, the ciliary body, or the like, and the retinal segment in the posterior segment. Or choroid or vitreous. Further, the examination target part may be a peripheral part of the eye such as a eyelid or an eye socket. By a known method, a cross-sectional image or a three-dimensional image of the eye to be examined can be formed based on the return light of the measurement light that has passed through the attachment for ophthalmic surgery.

  In this specification, the measurement light for performing the OCT examination and the return light of the measurement light from the eye to be examined are sometimes collectively referred to as OCT light. In addition, images acquired by OCT may be collectively referred to as OCT images. In addition, a measurement operation for forming an OCT image may be referred to as OCT measurement. In addition, it is possible to use suitably the description content of the literature described in this specification as the content of the following embodiment.

  In the following embodiment, a configuration to which Fourier domain type OCT is applied will be described. In particular, the microscope for ophthalmic surgery (attachment for ophthalmic surgery) according to the embodiment can perform OCT examination of an eye to be examined using a known swept source OCT technique.

  It is also possible to apply the configuration according to the present invention to a type other than a swept source, for example, an ophthalmic surgical microscope using a spectral domain OCT technique. In the following embodiments, an OCT apparatus including an OCT optical system and an ophthalmic surgical microscope will be described. However, an ophthalmic observation apparatus other than an ophthalmic surgical microscope, for example, a scanning laser opthalmoscope (Scanning Laser Ophthalmoscope). : SLO), a slit lamp, a fundus camera, and the like can be combined with an OCT apparatus having the configuration according to the present invention.

<First Embodiment>
1 and 2 show an optical system of the microscope for ophthalmologic surgery according to this embodiment. FIG. 1 shows the configuration of the optical system of the observation system when viewed from the operator side. FIG. 2 shows the configuration of the optical system of the illumination system and the interference optical system shown in FIG. 1 when viewed from the side as viewed from the operator. In FIG. 2, the same parts as those in FIG. In addition to the configuration shown in FIGS. 1 and 2, an optical system (assistant microscope) for the operator's assistant to observe the eye E can be provided.

  In this embodiment, the directions such as up and down, left and right, and front and rear are directions seen from the operator side unless otherwise specified. In addition, about the up-down direction, let the direction which goes to an observation object (test object E) from an objective lens be a downward direction, and let this opposite direction be an upper direction. Generally, since a patient undergoes surgery in a supine state, the vertical direction and the vertical direction are the same.

  The optical system of the microscope for ophthalmologic surgery 1 includes an illumination system 10, an OCT system 20, an optical path coupling member 30, a deflection member 40, an observation system 50, and an objective lens 70. The ophthalmic surgical microscope 1 includes an ophthalmic surgical attachment 100 configured to be detachable from the ophthalmic surgical microscope. At least a part of the OCT system 20 (for example, the collimating lens 22, the optical scanner 23, the OCT lens 24) and the optical path coupling member 30 are provided in the attachment 100 for ophthalmic surgery. Hereinafter, the illumination system 10, the OCT system 20, the optical path coupling member 30, and the deflection member 40 will be described mainly with reference to FIG. The observation system 50 will be described mainly with reference to FIG.

  The microscope for ophthalmologic surgery 1 may be configured to include a front lens 200 configured to be detachable at a position on the optical axis of the objective lens 70 as a main objective lens. The front lens 200 can be disposed at a position between the front focal position of the objective lens 70 and the eye E to be examined. The front lens 200 focuses the light from the illumination system 10 to illuminate the inside of the eye E (the posterior eye portion such as the retina and vitreous body). As the front lens 200, a plurality of lenses having different refractive powers (for example, 40D, 80D, 120D, etc.) are prepared, and these are alternatively used. FIG. 1 shows a state when the front lens 200 is retracted from a position on the optical axis of the objective lens 70. FIG. 2 shows a state when the front lens 200 is inserted at a position on the optical axis of the objective lens 70.

(Lighting system)
The illumination system 10 includes an illumination light source 11, a condenser lens 12, a diaphragm (illumination field diaphragm, field diaphragm) 13, and a lens unit 14. The illumination light source 11 emits illumination light including visible light. The condenser lens 12 condenses the illumination light emitted from the illumination light source 11. The diaphragm 13 limits the illumination field by the illumination light condensed by the condenser lens 12. The diaphragm 13 is provided at a position optically conjugate with the front focal position of the objective lens 70. The lens unit 14 has one or more lenses that convert the light that has passed through the diaphragm 13 into a parallel light flux. 2 illustrates an example in which the lens unit 14 is configured by one lens, the lens unit 14 may be configured by two or more lenses. The illumination light that has passed through the lens unit 14 is irradiated toward the eye E through the objective lens 70 of the observation system 50.

(OCT system)
The OCT system 20 includes an optical system for inspecting the eye E through the objective lens 70 by OCT. The OCT system 20 has the same configuration as a conventional Fourier domain type (for example, swept source type) OCT apparatus. That is, the OCT system 20 includes an interference optical system 21, a collimator lens 22, a focus adjustment mechanism 22 </ b> A, an optical scanner 23, and an OCT lens 24.

  The interference optical system 21 emits the measurement light out of the measurement light and the reference light obtained by dividing the light from the OCT light source, and interferes with the reference light and the return light of the measurement light from the eye to be inspected. Produce light. The interference optical system 21 includes, for example, a division unit and an interference unit. The dividing unit divides light from an OCT light source (for example, a wavelength sweep type light source) into measurement light and reference light. The OCT light source emits light in a near-infrared wavelength band that cannot be visually recognized by the human eye. The measurement light is emitted toward the eye E. The reference light is emitted toward a predetermined reference light path. The interference unit generates interference light by causing the return light of the measurement light passing through the eye E to interfere with the reference light passing through the reference light path. The interference light generated by the interference optical system 21 is detected by a detection unit (not shown). The detection signal obtained by the detection unit is sent to an arithmetic control unit (not shown). The arithmetic control unit performs arithmetic processing such as Fourier transform on the detection signal as in the conventional swept source type OCT apparatus. The interference optical system 21 may be configured to include an OCT light source.

  For example, one end of an optical fiber is connected to the interference optical system 21. The other end of the optical fiber is disposed at a position facing the collimating lens 22. The measurement light emitted from the interference optical system 21 is guided by an optical fiber and enters the collimating lens 22. In addition, the return light of the measurement light that has passed through the collimator lens 22 is guided by an optical fiber and is incident on a split portion of the interference optical system 21.

  The collimator lens 22 converts the measurement light emitted from the interference optical system 21 into a parallel light beam. The focus adjustment mechanism 22 </ b> A moves the collimator lens 22 along the optical axis of the OCT system 20. For example, the focus adjustment mechanism 22A includes a holding member that holds the collimating lens 22, a slide mechanism that moves the holding member in the optical axis direction of the OCT system 20, an actuator that generates a driving force, and a sliding mechanism that uses the driving force. And a member to be transmitted. The focus adjustment mechanism 22A can move the collimating lens 22 manually or automatically. When moving manually, the focus adjustment mechanism 22A can move the collimating lens 22 by controlling the actuator based on the operation content of a user (for example, an operator) with respect to an operation unit (not shown). In the case of automatic movement, for example, the focus adjustment mechanism 22A controls the actuator such that the control unit (not shown) returns the measurement light return light, the interference light, or the detection signal from the eye E to a predetermined intensity or higher. Thus, the collimating lens 22 can be moved.

  The optical scanner 23 deflects the measurement light converted into a parallel light beam by the collimator lens 22 two-dimensionally. Thereby, the optical scanner 23 can scan the eye E with the measurement light converted into a parallel light beam. For example, the optical scanner 23 deflects the measurement light in a second direction orthogonal to the first direction and a first galvanometer mirror that deflects the measurement light in a first direction within a scan plane set for the eye E. A second galvanometer mirror and a mechanism for driving these independently are configured. In this case, the optical scanner 23 can scan the eye E with the measurement light in any direction on the plane specified by the first direction and the second direction.

  The OCT lens 24 is disposed between the optical scanner 23 and the optical path coupling member 30 and functions as a variable power lens. The measurement light deflected by the optical scanner 23 passes through the OCT lens 24 and is guided to the optical path coupling member 30.

  The optical path coupling member 30 is disposed between the stop 13 and the lens unit 14 in the optical path of the illumination system 10, and couples the optical path of the OCT system 20 to the optical path of the illumination system 10. Specifically, the optical path coupling member 30 is disposed so as to face a lens provided at a position optically closest to the illumination light source 11 among one or more lenses constituting the lens unit 14. In this embodiment, the optical axis of the illumination system 10 and the optical axis of the OCT system 20 are arranged so as to be coaxial. For example, on the reflection surface of the optical path coupling member 30, the optical axis position of the OCT system 20 is arranged to coincide with the optical axis position of the illumination system 10. An example of the optical path coupling member 30 is a dichroic mirror. The collimator lens 22, the focus adjustment mechanism 22 </ b> A, the optical scanner 23, the OCT lens 24, and the optical path coupling member 30 are provided in the ophthalmic surgical attachment 100. Further, the interference optical system 21 may be provided in the ophthalmic surgical attachment 100. Furthermore, an OCT light source may be provided in the ophthalmic surgical attachment 100.

  The deflecting member 40 is disposed between the optical path coupling member 30 and the objective lens 70, and deflects light in the optical path of the illumination system 10 and light in the optical path of the OCT system 20 toward the objective lens 70. The deflection member 40 may be included in the observation system 50. Examples of the deflecting member 40 include a beam splitter, a half mirror, a dichroic mirror, and an epi-illumination mirror composed of one or more reflecting members. FIG. 1 shows a case where the deflecting member 40 is a beam splitter, and FIG. 2 shows a case where the deflecting member 40 is an epi-illumination mirror constituted by two reflecting members 40a and 40b.

  When the deflection member 40 is a beam splitter, the deflection member 40 is disposed in the optical path of the observation system 50. In this case, the beam splitter (deflection member 40) couples the optical path of the observation system 50 and the optical path of the OCT system 20 coaxially.

  When the deflection member 40 is an epi-illumination mirror, the deflection member 40 is preferably disposed outside the optical path of the observation system 50. In FIG. 2, the light passing through the lens unit 14 is reflected by the reflecting members 40a and 40b. The reflection member 40a is disposed so as to reflect the light that has not been reflected by the reflection member 40b among the light that has passed through the lens unit 14.

(Observation system)
The observation system 50 includes an optical system for observing the eye E to be examined illuminated by the illumination system 10 through the objective lens 70. As shown in FIG. 1, the observation system 50 is provided with a pair of left and right observation systems 50 </ b> L and 50 </ b> R and a photographing optical system 60. The left observation system 50L is called a left observation system (left observation optical axis 50La), and the right observation system 50R is called a right observation system (right observation optical axis 50Ra). The left and right observation systems 50L and 50R are disposed so as to sandwich the optical axis of the objective lens 70.

  The left and right observation systems 50L and 50R include a variable power lens system 51, an imaging lens 52, an image erecting prism 53, an eye width adjusting prism 54, a field stop 55, and an eyepiece lens 56, respectively. In the right observation system 50R, a beam splitter 57 is provided between the variable power lens system 51 and the imaging lens 52.

  The variable magnification lens system 51 includes a plurality of zoom lenses 51a, 51b, and 51c. Each of the zoom lenses 51a to 51c is movable in a direction along the left observation optical axis 50Ra or the right observation optical axis 50Ra by a zoom mechanism (not shown). Thereby, the magnification at the time of observing or photographing the eye E is changed.

  The beam splitter 57 separates a part of the observation light guided from the eye E along the right observation optical axis 50Ra and guides it to the photographing optical system 60. The imaging optical system 60 includes an imaging lens 61, a reflection mirror 62, and an imaging unit 63.

  The imaging unit 63 includes an imaging element 63a. The image pickup device 63a is configured by, for example, a charge coupled devices (CCD) image sensor, a complementary metal oxide semiconductor (CMOS) image sensor, or the like. An image sensor 63a having a two-dimensional light receiving surface (area sensor) is used.

  When the ophthalmic surgical microscope 1 is used, the light receiving surface of the image sensor 63a is, for example, a position optically conjugate with the surface of the cornea of the eye E or a depth from the apex of the cornea by ½ of the corneal curvature radius. It is arranged at a position optically conjugate with a position away in the direction.

  The image erecting prism 53 converts the inverted image into an erect image. The eye width adjustment prism 54 is an optical element for adjusting the distance between the left and right observation lights according to the eye width of the operator (the distance between the left eye and the right eye). The field stop 55 blocks the peripheral area in the cross section of the observation light and limits the visual field of the operator.

  In the configuration as described above, the ophthalmic surgical microscope 1 can irradiate the eye E with illumination light and observe the eye E regardless of the state of the attachment 100 for the ophthalmic surgery. That is, the illumination light output from the illumination light source 11 is condensed by the condenser lens 12 and is converted into a parallel light flux by the lens unit 14 via the diaphragm 13 and the optical path coupling member 30. The illumination light that has become a parallel light beam is deflected by the deflecting member 40 and irradiated to the eye E through the objective lens 70. When the front lens 200 is inserted at a position on the optical axis of the objective lens 70, the illumination light deflected by the deflection member 40 is irradiated to the eye E through the objective lens 70 and the front lens 200. The

  Illumination light (a part) irradiated to the eye E is reflected in the cornea or in the eye. Reflected light (sometimes referred to as observation light) of illumination light from the eye E enters the observation system 50 via the objective lens 70 (in some cases, the front lens 200). With such a configuration, an enlarged image of the eye E can be observed through the eyepiece lens 56. In addition, a captured image using the imaging unit 63 can be displayed on a display unit (not shown).

  When the ophthalmic surgical attachment 100 is attached to the ophthalmic surgical microscope 1, the optical path coupling member 30 is disposed between the diaphragm 13 and the lens unit 14. The measurement light obtained by dividing the light from the OCT light source is reflected by the optical path coupling member 30 via the collimating lens 22, the optical scanner 23, and the OCT lens 24. The measurement light reflected by the optical path coupling member 30 is deflected by the deflecting member 40 via the lens unit 14, and then passes through the objective lens 70 (and, in some cases, the front lens 200). To reach the eye E. The return light of the measurement light reflected by the eye E returns to the interference optical system 21 through the same path as described above. The interference optical system 21 generates interference light by causing the reference light obtained by dividing the light from the OCT light source to interfere with the return light of the measurement light. The interference light generated by the interference optical system 21 is detected by a detection unit (not shown). The detection signal obtained by the detection unit is sent to an arithmetic control unit (not shown). The arithmetic control unit performs arithmetic processing such as Fourier transform on the detection signal as in the conventional swept source type OCT apparatus. Based on the result of this arithmetic processing, the arithmetic control unit forms a cross-sectional image and a three-dimensional image of a predetermined part of the eye E, measures the size of the tissue (layer thickness, etc.), and functional information (blood flow). Information etc.).

  According to this embodiment, since the aperture of the optical element through which the measurement light of the OCT system 20 and the return light (OCT light) of the measurement light pass can be increased, the aperture that affects the resolution of the measurement light of the OCT system 20 It becomes possible to design a large scan range by the number and measurement light. In addition, since the optical path of the OCT system 20 is coupled to the optical path of the illumination system 10 at a position between the diaphragm 13 and the lens unit 14, the lens unit 14 is shared by the illumination system 10 and the OCT system 20. Therefore, it is possible to realize a compact apparatus by reducing the number of optical elements.

  In general, a relatively wide physical space can be secured between the aperture 13 and the lens unit 14. Therefore, the collimating lens 22, the optical scanner 23, the OCT lens 24, and the optical path coupling member 30 are modularized, so that the ophthalmology is not affected by the vibration or the like on the optical system such as the positional deviation or the axial deviation of the diaphragm 13. It is possible to provide an ophthalmic surgical attachment 100 that can be easily attached to and detached from the surgical microscope 1. An adjustment mechanism such as a positional deviation or an axial deviation of the diaphragm 13 may be provided.

  In this embodiment, the case where at least a part of the OCT system 20 and the optical path coupling member 30 are modularized as the attachment for ophthalmic surgery 100 has been described, but these may not be modularized.

[Action / Effect]
Actions and effects of the microscope for ophthalmic surgery and the attachment for ophthalmic surgery according to the embodiment will be described.

  The microscope for ophthalmic surgery (for example, the microscope for ophthalmic surgery 1) according to the embodiment includes an objective lens (for example, the objective lens 70), an illumination system (for example, the illumination system 10), and an observation system (for example, the observation system 50). And an OCT system (for example, OCT system 20) and an optical path coupling member (for example, optical path coupling member 30). The illumination system includes a diaphragm (for example, the diaphragm 13) and a lens unit (for example, the lens unit 14), and irradiates the eye to be examined (for example, the eye E to be examined) with the light passing through the lens unit through the objective lens. . The diaphragm is irradiated with light from a light source. The lens unit has one or more lenses that convert the light that has passed through the diaphragm into parallel light fluxes. The observation system is used for observing the eye to be examined illuminated by the illumination system through the objective lens. The OCT system is used for inspecting an eye to be examined through an objective lens by OCT. The optical path coupling member is disposed between the stop and the lens unit, and couples the OCT optical path to the illumination optical path.

  According to such a configuration, the diameter of the optical element through which the OCT measurement light passes can be increased in an ophthalmic surgical microscope used for the operation of the subject's eye, and this affects the resolution of the OCT measurement light. Therefore, it is possible to design a large numerical aperture and a scanning range by measuring light. In addition, since the optical path of the OCT system is coupled to the optical path of the illumination system at a position between the stop and the lens unit, the lens unit can be shared between the illumination system and the OCT system, and the number of optical elements can be reduced. It is possible to realize a compact apparatus. In addition, since the OCT optical path is coupled to the illumination optical path, a wide range and high resolution OCT inspection can be performed.

  The ophthalmic surgical microscope is disposed between the optical path coupling member and the objective lens, and deflects the light in the optical path of the illumination system and the light in the optical path of the OCT system toward the objective lens (for example, a deflection member). 40).

  According to such a configuration, since the eye to be examined can be illuminated from the objective lens side, the apparatus can be made compact.

  The deflecting member may include a beam splitter disposed in the optical path of the observation system.

  According to such a configuration, since the deflecting member that deflects the illumination light and the OCT light can be arranged in the observation optical path, the apparatus can be made compact.

  Further, the beam splitter may coaxially couple the optical path of the observation system and the optical path of the OCT system.

  According to such a configuration, it is possible to perform an OCT examination on the eye to be examined under conditions close to the state of being observed by the observation system.

  The OCT system emits measurement light out of the measurement light and the reference light obtained by dividing the light from the OCT light source, and causes interference between the reference light and the return light of the measurement light from the eye to be examined. A collimating lens (for example, a collimating lens 22) that converts measurement light emitted from an interference optical system (for example, the interference optical system 21) that generates light into a parallel light beam and two-dimensional measurement light that has been converted into a parallel light beam by the collimating lens The optical scanner (for example, optical scanner 23) which deflects automatically, and the OCT lens (for example, OCT lens 24) arrange | positioned between an optical scanner and an optical path coupling member may be included.

  According to such a configuration, an OCT examination can be performed by a known technique in an ophthalmic surgical microscope used for surgery of an eye to be examined.

  The microscope for ophthalmic surgery may include a focus adjustment mechanism (for example, the focus adjustment mechanism 22A) that moves the collimating lens along the optical axis of the OCT system.

  According to such a configuration, a high-resolution OCT examination can be performed in an optimum examination state in an ophthalmic surgery microscope used for surgery of an eye to be examined.

  The ophthalmic surgical microscope includes an ophthalmic surgical attachment (for example, an ophthalmic surgical attachment 100) configured to be detachable from the ophthalmic surgical microscope, and includes a collimating lens, an optical scanner, an OCT lens, and an optical path coupling member. May be provided in the ophthalmic surgical attachment.

  According to such a configuration, the collimating lens, the optical scanner, the OCT lens, and the optical path coupling member are modularized so as to be detachable from the ophthalmic surgical microscope, so that the ophthalmic surgical microscope can be an apparatus capable of OCT examination. Can be switched.

  An ophthalmic surgical attachment configured to be detachable from an ophthalmic surgical microscope and to inspect an eye to be examined through an objective lens by OCT includes a collimating lens, an optical scanner, an OCT lens, and an optical path coupling member. And the optical path coupling member may be disposed between the diaphragm and the lens unit. The microscope for ophthalmologic surgery includes an objective lens, a diaphragm to which light from a light source is irradiated, and a lens unit having one or more lenses that convert the light that has passed through the diaphragm into a parallel luminous flux, and the light that has passed through the lens unit. An illumination system for irradiating the eye to be examined via the objective lens and an observation system for observing the eye to be examined illuminated by the illumination system via the objective lens are included. The interference optical system emits the measurement light out of the measurement light and the reference light obtained by dividing the light from the OCT light source, and interferes the reference light and the return light of the measurement light from the eye to be examined to cause interference light. Is generated. The collimating lens converts the measurement light emitted from the interference optical system into a parallel light beam. The optical scanner deflects the measurement light that has been converted into a parallel light beam by the collimating lens in a two-dimensional manner. The measurement light deflected by the optical scanner passes through the OCT lens. The optical path coupling member is used to couple the optical path of the measurement light that has passed through the OCT lens to the optical path of the illumination system.

  According to such a configuration, it is possible to provide an ophthalmic surgical attachment that can be easily attached to and detached from the ophthalmic surgical microscope by modularizing the collimating lens, the optical scanner, the OCT lens, and the optical path coupling member. In general, a relatively wide physical space can be secured between the diaphragm and the lens unit, or between the lens unit and the objective lens. Therefore, the ophthalmic surgical microscope can be switched to an apparatus capable of OCT inspection without affecting the optical system such as the displacement of the aperture and the axial displacement.

<Second Embodiment>
In the first embodiment, since the illumination optical path and the OCT optical path are coaxially coupled, vignetting may occur in measurement light from the OCT system 20 due to the deflection member 40 or the iris (pupil) of the eye E to be examined. . In particular, when the deflecting member 40 is configured by an epi-illumination mirror, the reflecting member that constitutes the epi-illumination mirror has a complicated shape, and thus vignetting may occur in measurement light from the OCT system 20. If vignetting occurs in the measurement light, the range of the OCT scan is limited, and the performance of the OCT system 20 cannot be fully exhibited.

  Therefore, in the second embodiment, the optical axis of the illumination system and the optical axis of the OCT system are arranged so as to be non-coaxial. The optical axis of the illumination system and the optical axis of the OCT system may be fixed so as to be non-coaxial, and the optical axis can be adjusted by relatively moving both optical axes as in this embodiment. It may be.

  The configuration of the microscope for ophthalmic surgery according to the second embodiment is the same as that of the first embodiment. In the following, the second embodiment will be described focusing on the differences from the first embodiment.

  FIG. 3 shows an optical system of the microscope for ophthalmologic surgery according to the second embodiment. In FIG. 3, the same parts as those in FIG.

  The difference between the configuration of the ophthalmic surgical microscope 1a according to the second embodiment and the configuration of the ophthalmic surgical microscope 1 according to the first embodiment is that the optical axis adjusting mechanism 21A is included. The OCT system 20a includes an interference optical system 21, an optical axis adjustment mechanism 21A, a collimator lens 22, a focus adjustment mechanism 22A, an optical scanner 23, and an OCT lens 24. The ophthalmic surgical attachment 100 a includes a collimating lens 22, a focus adjustment mechanism 22 </ b> A, an optical scanner 23, an OCT lens 24, and an optical path coupling member 30. The ophthalmic surgical attachment 100a may further include an interference optical system 21 and an optical axis adjustment mechanism 21A. The ophthalmic surgical attachment 100a may further include an OCT light source.

  The optical axis adjustment mechanism 21 </ b> A relatively moves the optical axis of the illumination system 10 and the optical axis of the OCT system 20. The optical axis adjustment mechanism 21 </ b> A relatively moves the optical axis of the illumination system 10 and the optical axis of the OCT system 20 by changing the direction of the measurement light emitted from the interference optical system 21, for example. As a method of changing the direction of the measurement light emitted from the interference optical system 21, a method of tilting the end of an optical fiber that emits measurement light from the interference optical system 21, or a housing that holds an optical element that constitutes the interference optical system 21. There are ways to tilt the body itself. When the end of the optical fiber is tilted, the optical axis adjusting mechanism 21A emits measurement light with a holding member that holds the other end of the optical fiber whose one end is connected to the interference optical system 21 movably and a predetermined emission direction as a reference. An output angle deflection member that moves the holding member so as to change the angle, an actuator that generates a driving force, and a member that transmits the driving force to the output angle deflection member are configured. The optical axis adjustment mechanism 21A can move the optical axis of the OCT system 20 toward the center of the pupil of the eye E by the above mechanism.

  In the optical axis adjusting mechanism 21A, the optical axis of the illumination system 10 (for example, the center of the illumination light beam) and the optical axis of the OCT system 20 (for example, the center of the measurement light beam) are deflected members 40 (in the case of FIG. 3, a reflection member). The optical axis of the illumination system 10 and the optical axis of the OCT system 20 are relatively moved so as to be arranged at different positions on the reflecting surfaces 40a and 40b). As a result, the optical path coupling member 30 non-coaxially couples the optical path of the OCT system 20 to the optical path of the illumination system 10.

  FIG. 4A and FIG. 4B are operation explanatory diagrams when observing the fundus of the eye E to be examined. When observing the fundus of the eye E, the front lens 200 is inserted between the objective lens 70 and the eye E as shown in FIG. FIG. 4A schematically shows the pupils of the optical systems that are incident on the pupil of the eye E when the measurement light is vignetted by the deflecting member 40 (the epi-illumination mirror). FIG. 4B schematically shows the pupils of the optical systems incident on the pupil of the eye E when the direction of the measurement light from the interference optical system 21 is changed by the optical axis adjustment mechanism 21A. In FIG. 4B, the same parts as in FIG.

  When observing the fundus of the eye E, the illumination pupil (image) of the illumination system 10 and the observation pupil of the observation system 50 are arranged in the pupil P of the eye E so that vignetting due to the iris R does not occur. For example, the illumination pupil L1 by the illumination light reflected by the reflecting member 40b out of the illumination light emitted by the illumination system 10, and the illumination by the illumination light reflected by the reflecting member 40a among the illumination light emitted by the illumination system 10 The pupil L2, the observation pupil B1 of the left observation system 50L, and the observation pupil B2 of the right observation system 50R are arranged in the pupil P of the eye E as shown in FIG. Here, when the deflecting member 40 is configured by an epi-illumination mirror having a complicated shape, if the OCT pupil of the OCT system 20 is further arranged in the pupil P, for example, the OCT pupil of the OCT system 20 overlaps the illumination pupil L1. C1 is arranged, and the OCT pupil C2 of the OCT system 20 may be arranged so as to overlap the illumination pupil L2. In this case, vignetting occurs in the measurement light of the OCT system 20 by the deflecting member 40 (an epi-illumination mirror).

  In this embodiment, when the direction of the measurement light emitted from the interference optical system 21 is changed by the optical axis adjustment mechanism 21A, the OCT pupil C3 of the OCT system 20 is arranged so as to overlap the illumination pupil L1, as shown in FIG. 4B. can do. As a result, the occurrence of vignetting of the measurement light by the deflection member 40 can be suppressed, and the performance of the OCT system 20 can be sufficiently exhibited without limiting the range of the OCT scan.

  FIG. 5A and FIG. 5B are operation explanatory diagrams when observing the fundus of the eye E to be examined, which is a small pupil. FIG. 5A schematically shows the pupils of the optical systems that have entered the pupil of the eye E when vignetting occurs in the measurement light due to the iris of the eye E being a small pupil. FIG. 5B schematically shows the pupils of the optical systems incident on the pupil of the eye E when the direction of the measurement light from the interference optical system 21 is changed by the optical axis adjustment mechanism 21A. 5A and 5B, the same parts as those in FIGS. 4A and 4B are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  When the eye E is a small pupil, the OCT pupil C3 of the OCT system 20 is arranged as shown in FIG. 5A, and the iris R may cause vignetting in the measurement light. Here, when the direction of the measurement light emitted from the interference optical system 21 is changed by the optical axis adjustment mechanism 21A, the OCT pupil C4 of the OCT system 20 is overlapped with the illumination pupil L1 in the pupil P as shown in FIG. 5B. Can be arranged. As a result, the occurrence of vignetting of measurement light due to the iris R can be suppressed, and the performance of the OCT system 20 can be sufficiently exhibited without limiting the range of the OCT scan. This is particularly effective when the pupil of the eye E is small during fundus observation of the eye E and the position adjustment of the apparatus is not sufficient.

  In this embodiment, the case where the optical axis adjustment mechanism 21A adjusts the optical axis of the OCT system 20 has been described. However, the optical axis of the illumination system 10 can be changed by changing the direction of the illumination light emitted from the illumination system 10. And the optical axis of the OCT system 20 may be moved relative to each other.

[Action / Effect]
The microscope for ophthalmic surgery according to the embodiment may include an optical axis adjustment mechanism (for example, an optical axis adjustment mechanism 21A) that relatively moves the optical axis of the illumination system and the optical axis of the OCT system.

  According to such a configuration, it is possible to suppress the occurrence of vignetting of the OCT system light due to the deflection member or the iris of the eye to be examined, and the OCT system performance is sufficiently exhibited without limiting the range of the OCT scan. It becomes possible.

  The optical axis adjustment mechanism emits the measurement light out of the measurement light and the reference light obtained by dividing the light from the OCT light source, and returns the measurement light from the reference light and the eye to be examined. The optical axis of the illumination system and the optical axis of the OCT system may be moved relative to each other by changing the direction of the measurement light emitted from the interference optical system that generates interference light by interfering with each other.

  According to such a configuration, it is possible to provide an ophthalmic surgical microscope capable of sufficiently exhibiting the performance of the OCT system with a relatively simple configuration.

<Third embodiment>
In the first embodiment or the second embodiment, the case where the optical path coupling member 30 is disposed between the diaphragm 13 and the lens unit 14 has been described. However, the configuration of the microscope for ophthalmic surgery according to the embodiment is limited to this. It is not something.

  In the third embodiment, the optical path coupling member 30 is disposed between the lens unit 14 and the objective lens 70. The optical axis of the illumination system and the optical axis of the OCT system are arranged so as to be coaxial.

  The configuration of the microscope for ophthalmic surgery according to the third embodiment is the same as that of the first embodiment. In the following, the third embodiment will be described focusing on the differences from the first embodiment.

  FIG. 6 shows an optical system of the microscope for ophthalmic surgery according to the third embodiment. In FIG. 6, the same parts as those in FIG.

  The main difference between the configuration of the ophthalmic surgical microscope 1b according to the third embodiment and the configuration of the ophthalmic surgical microscope 1 according to the first embodiment is that the optical path coupling member 30 includes the lens unit 14 and the objective lens 70 (deflecting member 40). ) And an OCT lens 24b composed of two or more lenses in place of the OCT lens 24.

  The optical path coupling member 30 is disposed between the lens unit 14 and the objective lens 70 in the optical path of the illumination system 10, and couples the optical path of the OCT system 20 to the optical path of the illumination system 10. Specifically, the optical path coupling member 30 is disposed so as to face a lens provided at a position optically closest to the objective lens 70 among one or more lenses constituting the lens unit 14. In FIG. 6, the deflection member 40 is disposed between the optical path coupling member 30 and the objective lens 70.

  In this embodiment, the measurement light of the OCT system 20 is irradiated to the eye E without passing through the lens unit 14. Therefore, for example, by providing the OCT lens 24b as shown in FIG. 6, it is possible to design in consideration of transmission loss and aberration of measurement light. Therefore, according to this embodiment, compared with the first embodiment in which the lens unit 14 is shared by the illumination system 10 and the OCT system 20, it is possible to improve the accuracy of the OCT inspection using the measurement light from the OCT system 20. It becomes possible.

  In this embodiment, the optical path coupling member 30 is arranged in a parallel optical path in which illumination light from the illumination system 10 is converted into a parallel light flux. Therefore, the influence on the illumination system 10 (for example, the positional deviation of the optical element of the illumination system 10, etc.) accompanying attachment / detachment of the attachment 100b for ophthalmic surgery with respect to the microscope 1 for ophthalmic surgery can be reduced.

[Action / Effect]
The microscope for ophthalmic surgery according to the embodiment includes an objective lens, a diaphragm irradiated with light from a light source, and a lens unit having one or more lenses that convert the light that has passed through the diaphragm into parallel light fluxes. An illumination system for irradiating the eye to be examined with the passed light via the objective lens, an observation system for observing the eye to be examined illuminated by the illumination system via the objective lens, and the eye to be examined by OCT via the objective lens And an optical path coupling member that is disposed between the lens unit and the objective lens and couples the optical path of the OCT system to the optical path of the illumination system.

  According to such a configuration, the diameter of the optical element through which the OCT measurement light passes can be increased in an ophthalmic surgical microscope used for the operation of the subject's eye, and this affects the resolution of the OCT measurement light. Therefore, it is possible to design a large numerical aperture and a scanning range by measuring light. Further, since the optical path of the OCT system is coupled to the optical path of the illumination system at a position between the lens unit and the objective lens, it is possible to improve the accuracy of the OCT inspection by designing considering only the OCT system. . In addition, since at least the optical elements such as the objective lens 70 are shared, it is possible to realize a compact apparatus by reducing the number of optical elements. Further, as in the first embodiment, a wide range and high resolution OCT inspection can be performed.

  The ophthalmic surgical attachment according to the embodiment includes an objective lens, a diaphragm that is irradiated with light from the light source, and a lens unit that includes one or more lenses that convert the light that has passed through the diaphragm into parallel light fluxes. For an ophthalmic surgical microscope including an illumination system that irradiates the eye to be examined with light passing through the unit via an objective lens, and an observation system for observing the eye to be examined illuminated by the illumination system via the objective lens It is configured to be detachable, and is used for inspecting an eye to be examined through an objective lens by OCT. The ophthalmic surgical attachment emits measurement light out of measurement light and reference light obtained by dividing light from an OCT light source, and interferes with reference light and return light of measurement light from the eye to be examined. A collimating lens that converts the measurement light emitted from the interference optical system that generates light into a parallel light beam, a light scanner that deflects the measurement light that has been converted into a parallel light beam by the collimating lens, and a measurement that is deflected by the light scanner Including an OCT lens through which light passes, and an optical path coupling member for coupling an optical path of measurement light that has passed through the OCT lens to an optical path of an illumination system, and when the optical path coupling member is mounted on an ophthalmic surgical microscope, Arranged between the lens unit and the objective lens.

  According to such a configuration, it is possible to provide an ophthalmic surgical attachment that can be easily attached to and detached from the ophthalmic surgical microscope by modularizing the collimating lens, the optical scanner, the OCT lens, and the optical path coupling member. A relatively wide physical space can be secured between the lens unit and the objective lens. Therefore, the ophthalmic surgical microscope can be switched to an apparatus capable of OCT examination without affecting the optical system such as the positional deviation and axial deviation of the lens unit.

<Fourth embodiment>
In the third embodiment, since the illumination optical path and the OCT optical path are coaxially coupled as in the first embodiment, vignetting occurs in the measurement light from the OCT system 20, and the range of the OCT scan is limited. In some cases, the performance of the OCT system 20 cannot be fully exhibited.

  Therefore, in the fourth embodiment, similarly to the third embodiment, the optical axis of the illumination system and the optical axis of the OCT system are arranged so as to be non-coaxial, as in the second embodiment. The optical axis of the illumination system and the optical axis of the OCT system may be fixed so as to be non-coaxial, and the optical axis can be adjusted by relatively moving both optical axes as in this embodiment. It may be.

  The configuration of the microscope for ophthalmic surgery according to the fourth embodiment is the same as that of the third embodiment. In the following, the fourth embodiment will be described focusing on the differences from the third embodiment.

  FIG. 7 shows an optical system of the microscope for ophthalmic surgery according to the fourth embodiment. In FIG. 7, the same parts as those in FIG.

  The configuration of the ophthalmic surgical microscope 1c according to the fourth embodiment is different from the configuration of the ophthalmic surgical microscope 1b according to the third embodiment in that it includes an optical axis adjustment mechanism 21A similar to the second embodiment. The OCT system 20c includes an interference optical system 21, an optical axis adjustment mechanism 21A, a collimator lens 22, a focus adjustment mechanism 22A, an optical scanner 23, and an OCT lens 24b. The ophthalmic surgical attachment 100 c includes a collimating lens 22, a focus adjustment mechanism 22 </ b> A, an optical scanner 23, an OCT lens 24 b, and an optical path coupling member 30. The ophthalmic surgical attachment 100c may further include an interference optical system 21 and an optical axis adjustment mechanism 21A. The ophthalmic surgical attachment 100c may further include an OCT light source.

  The optical axis adjustment mechanism 21A relatively moves the optical axis of the illumination system 10 and the optical axis of the OCT system 20c. For example, the optical axis adjustment mechanism 21A relatively moves the optical axis of the illumination system 10 and the optical axis of the OCT system 20c by changing the direction of the measurement light emitted from the interference optical system 21. Since the optical axis adjustment mechanism 21A is the same as that of the second embodiment, detailed description thereof is omitted. Note that the optical axis adjustment mechanism 21A may relatively move the optical axis of the illumination system 10 and the optical axis of the OCT system 20c by changing the direction of the illumination light emitted from the illumination system 10, for example. .

  FIG. 8A and FIG. 8B are operation explanatory diagrams when observing the fundus of the eye E. FIG. FIG. 8A schematically shows the pupils of the respective optical systems that are incident on the pupil of the eye E when vignetting occurs in the measurement light due to misalignment. FIG. 8B schematically shows the pupils of the optical systems incident on the pupil of the eye E when the direction of the measurement light from the interference optical system 21 is changed by the optical axis adjustment mechanism 21A. In FIG. 8B, the same parts as those in FIG. 8A are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  For example, when there is a position shift of the eye E with respect to the optical axis of the objective lens 70, the OCT pupil C4 of the OCT system 20c is arranged as shown in FIG. 8A, and vignetting may occur in the measurement light. Here, when the direction of the measurement light emitted from the interference optical system 21 is changed by the optical axis adjustment mechanism 21A, the OCT pupil C5 of the OCT system 20c is overlapped with the illumination pupil L1 in the pupil P as shown in FIG. 8B. Can be arranged. As a result, it is possible to suppress the occurrence of vignetting of the measurement light due to the positional deviation, and it is possible to sufficiently exhibit the performance of the OCT system 20c without limiting the range of the OCT scan.

  As described above, according to this embodiment, in addition to the effect of the third embodiment, it is possible to obtain the effect of adjusting the optical axis as in the second embodiment.

<Fifth embodiment>
In the fourth embodiment, the case where the optical axis of the OCT system is shifted with respect to the optical axis of the illumination system by changing the direction of the measurement light emitted from the interference optical system has been described. The configuration of the surgical microscope is not limited to this.

  In the fifth embodiment, the optical axis of the OCT system is shifted with respect to the optical axis of the illumination system by integrally translating the optical scanner 23 and the OCT lens 24b.

  The configuration of the ophthalmic surgical microscope according to the fifth embodiment is the same as that of the third embodiment. In the following, the fifth embodiment will be described focusing on the differences from the third embodiment.

  FIG. 9 shows an optical system of a microscope for ophthalmic surgery according to the fifth embodiment. 9, parts that are the same as those in FIG. 6 are given the same reference numerals, and descriptions thereof will be omitted as appropriate.

  The configuration of the ophthalmic surgical microscope 1d according to the fifth embodiment is different from the configuration of the ophthalmic surgical microscope 1b according to the third embodiment in that the optical scanner 23 and the OCT lens 24b are integrated as a scanner unit 25. The optical axis adjusting mechanism 25A for moving the scanner unit 25 in parallel is provided. The OCT system 20d includes an interference optical system 21, a collimator lens 22, a focus adjustment mechanism 22A, a scanner unit 25 including an optical scanner 23 and an OCT lens 24b, and an optical axis adjustment mechanism 25A. The ophthalmic surgical attachment 100d includes a collimator lens 22, a focus adjustment mechanism 22A, a scanner unit 25 including an optical scanner 23 and an OCT lens 24b, an optical axis adjustment mechanism 25A, and an optical path coupling member 30. The ophthalmic surgical attachment 100d may further include an interference optical system 21 and an optical axis adjustment mechanism 21A. The ophthalmic surgical attachment 100d may further include an OCT light source.

  The optical axis adjustment mechanism 25A moves the scanner unit 25 in parallel. For example, the optical axis adjustment mechanism 25A translates the scanner unit 25 in a third direction parallel to the optical axis of the illumination system 10 and a fourth direction orthogonal to the third direction. Accordingly, the optical axis of the illumination system 10 and the optical axis of the OCT system 20d are relatively moved so that the optical axis of the illumination system 10 and the optical axis of the OCT system 20d are arranged at different positions on the reflection surface of the deflecting member 40. Can be made. In the fifth embodiment, since the optical path coupling member 30 is disposed in the parallel optical path in which the illumination light is converted into a parallel light flux, the position of the scan plane in the eye E is highly accurate without being affected by refraction by the lens unit 14. Can be adjusted. In addition, the optical axis can be shifted over a wide range as compared with the second embodiment and the fourth embodiment.

[Action / Effect]
The microscope for ophthalmic surgery according to the embodiment includes an optical axis adjustment mechanism (for example, optical axis adjustment) that relatively moves an optical axis of an illumination system (for example, illumination system 10) and an optical axis of an OCT system (for example, OCT system 20d). The optical path coupling member including the mechanism 25A) is disposed between the lens unit and the objective lens. The optical axis adjustment mechanism relatively moves the optical axis of the illumination system and the optical axis of the OCT system by changing the positions of the optical scanner and the OCT lens.

  According to such a configuration, since the optical path coupling member is arranged in the parallel optical path in which the illumination light is converted into a parallel light flux, the position of the scan plane in the eye to be examined is highly accurate without being affected by refraction by the lens unit. Can be adjusted. Further, the occurrence of vignetting of the OCT system can be suppressed, and the OCT system performance can be sufficiently exhibited without limiting the range of the OCT scan.

<Sixth embodiment>
The configuration for shifting the optical axis of the OCT system with respect to the optical axis of the illumination system is not limited to the configuration of the fourth embodiment or the fifth embodiment.

  In the sixth embodiment, a parallel plane plate that can be disposed with an incident surface inclined with respect to the optical axis of the OCT system is provided between the optical scanner and the optical path coupling member with respect to the optical axis of the illumination system. The optical axis of the OCT system is shifted.

  The configuration of the microscope for ophthalmic surgery according to the sixth embodiment is the same as that of the third embodiment. In the following, the sixth embodiment will be described focusing on differences from the third embodiment.

  FIG. 10 shows an optical system of the microscope for ophthalmic surgery according to the sixth embodiment. 10, parts that are the same as those in FIG. 6 are given the same reference numerals, and descriptions thereof will be omitted as appropriate.

  The configuration of the ophthalmic surgical microscope 1e according to the sixth embodiment is different from the configuration of the ophthalmic surgical microscope 1b according to the third embodiment in that it can be inserted and removed between the optical scanner 23 and the optical path coupling member 30. The parallel plane plate 26 and the optical axis adjusting mechanism 26A for moving the parallel plane plate 26 are provided. The OCT system 20e includes an interference optical system 21, a collimator lens 22, a focus adjustment mechanism 22A, an optical scanner 23, an OCT lens 24b, a parallel plane plate 26, and an optical axis adjustment mechanism 26A. The ophthalmic surgical attachment 100e includes a collimator lens 22, a focus adjustment mechanism 22A, an optical scanner 23, an OCT lens 24b, a parallel plane plate 26, an optical axis adjustment mechanism 26A, and an optical path coupling member 30. The ophthalmic surgical attachment 100e may further include an interference optical system 21 and an optical axis adjustment mechanism 21A. The ophthalmic surgical attachment 100e may further include an OCT light source.

  For example, the plane parallel plate 26 is an optical element provided such that the incident surface and the exit surface are parallel to each other, and transmits the measurement light or its return light in the OCT system 20e. The plane parallel plate 26 is configured to be detachable between the optical scanner 23 and the optical path coupling member 30, and when the plane parallel plate 26 is inserted between the optical scanner 23 and the optical path coupling member 30, the incident surface is light of the OCT system 20 e. Arranged in an inclined state with respect to the axis. In FIG. 10, the plane parallel plate 26 is configured to be detachable between the OCT lens 24 b and the optical path coupling member 30.

  The optical axis adjustment mechanism 26 </ b> A moves the parallel flat plate 26 so as to be inserted / removed at a position on the optical axis of the OCT system 20 e between the OCT lens 24 b and the optical path coupling member 30. Thereby, the light of the illumination system 10 is refracted so that the optical axis of the illumination system 10 and the optical axis of the OCT system 20e are arranged at different positions on the reflection surface of the deflecting member 40. The axis and the optical axis of the OCT system 20e can be moved relative to each other. In the sixth embodiment, since the optical path coupling member 30 is arranged in the parallel optical path in which the illumination light is converted into a parallel light flux, the position of the scan plane in the eye E is stepwise without being affected by the refraction by the lens unit 14. Can be adjusted.

  In addition, in a state where the plane parallel plate 26 is disposed at a position between the OCT lens 24b and the optical path coupling member 30, the optical axis adjustment mechanism 26A can further change the direction of the incident surface of the plane parallel plate 26. Thus, the position of the scan plane in the eye E can be adjusted more finely. Further, the plane parallel plate 26 is fixed and arranged in advance between the OCT lens 24b and the optical path coupling member 30, and the direction of the incident plane of the plane parallel plate 26 can be changed by the optical axis adjusting mechanism 26A. Good.

[Action / Effect]
As described above, the microscope for ophthalmic surgery according to the embodiment has an incident surface inclined with respect to the optical axis of the OCT system (for example, the OCT system 20e), and can be inserted and removed between the optical scanner and the optical path coupling member. A parallel plane plate (for example, parallel plane plate 26), and an optical axis adjustment mechanism (for example, optical axis adjustment mechanism 26A) for inserting and removing the parallel plane plate at a position between the optical scanner and the optical path coupling member. The optical path coupling member is disposed between the lens unit and the objective lens, and the optical axis adjustment mechanism inserts and removes the parallel plane plate at a position between the optical scanner and the optical path coupling member. The optical axis and the OCT optical axis are moved relative to each other.

  In addition, the microscope for ophthalmic surgery according to the embodiment is disposed between the optical scanner and the optical path coupling member, and is a parallel flat plate (for example, a parallel flat plate) configured to change the direction of the incident surface with respect to the optical axis of the OCT system. A face plate 26) and an optical axis adjusting mechanism (for example, an optical axis adjusting mechanism 26A) for changing the direction of the incident surface, and the optical path coupling member is disposed between the lens unit and the objective lens. Changes the direction of the incident surface to relatively move the optical axis of the illumination system and the optical axis of the OCT system.

  According to any of the above configurations, since the optical path coupling member is disposed in the parallel optical path in which the illumination light is converted into a parallel light flux, the position of the scan plane in the eye to be examined is increased without being affected by refraction by the lens unit. The accuracy can be adjusted. Further, the occurrence of vignetting of the OCT system can be suppressed, and the OCT system performance can be sufficiently exhibited without limiting the range of the OCT scan.

<Seventh embodiment>
In the ophthalmic surgical microscope provided with the optical axis adjustment mechanism described above, by providing a beam splitter disposed on the observation optical axis in at least a part of the deflecting member 40, the optical axis of the OCT system and the observation optical axis are coaxial. And a non-coaxial state in which the OCT optical axis and the observation optical axis are non-coaxial.

  The configuration of the microscope for ophthalmic surgery according to the seventh embodiment is the same as that of the sixth embodiment. In the following, the seventh embodiment will be described focusing on differences from the sixth embodiment.

  FIG. 11 shows an optical system of the microscope for ophthalmic surgery according to the seventh embodiment. In FIG. 11, the same parts as those in FIG.

  The configuration of the ophthalmic surgery microscope 1f according to the seventh embodiment is different from the configuration of the ophthalmic surgery microscope 1e according to the sixth embodiment in that a deflection member 40A is provided instead of the deflection member 40. The deflecting member 40A includes a reflecting member 40f and a beam splitter 40g. The beam splitter 40g is disposed on the observation optical axis (the left observation optical axis 50La or the right observation optical axis 50Ra) of the observation system 50, and couples the optical path of the illumination system 10 and the optical path of the observation system 50. Note that the deflecting member 40A may couple the optical path of the illumination system 10 and the optical path of the observation system 50 by another optical element such as a dichroic mirror or a half mirror instead of the beam splitter 40g.

  In such a configuration, the optical axis of the OCT system 20e is adjusted coaxially with respect to the observation optical axis by adjusting the optical axis of the OCT system 20e with respect to the optical axis of the illumination system 10 by the optical axis adjustment mechanism 26A. Or can be adjusted non-coaxial.

  FIG. 12A and FIG. 12B are explanatory diagrams of operations when observing the fundus of the eye E to be examined. FIG. 12A schematically shows the pupils of the optical systems incident on the pupil of the eye E when the optical axis of the OCT system 20e is adjusted to be coaxial with the observation optical axis. FIG. 12B schematically shows the pupils of the optical systems that have entered the pupil of the eye E when the optical axis of the OCT system 20e is adjusted to be non-coaxial with the observation optical axis. In FIG. 12B, the same parts as in FIG.

  When the optical axis of the OCT system 20e is adjusted to be coaxial with the observation optical axis, the OCT pupil C6 of the OCT system 20e is arranged so as to overlap the observation pupil B1 of the left observation system 50L as shown in FIG. 12A. Is done. At this time, inspection by OCT is possible under conditions close to the state of observation by the observation system 50.

  On the other hand, when the optical axis of the OCT system 20e is adjusted to be non-coaxial with the observation optical axis, the OCT pupil C7 of the OCT system 20e becomes an observation pupil B1 of the left observation system 50L as shown in FIG. 12B. And the observation pupil B2 of the right observation system 50R. At this time, the occurrence of vignetting as described above can be suppressed, and the performance of the OCT system 20e can be sufficiently exhibited without limiting the range of the OCT scan.

[Other variations]
The embodiment described above is merely an example for carrying out the present invention. A person who intends to implement the present invention can make arbitrary modifications, omissions, additions and the like within the scope of the present invention.

  It is possible to arbitrarily combine the configurations described in the first to seventh embodiments. For example, in a system to which two or more embodiments of the first to seventh embodiments can be applied, a desired embodiment of the two or more embodiments can be alternatively applied by switching operation modes. Is possible.

1, 1a, 1b, 1c, 1d, 1e, 1f Ophthalmic surgical microscope 10 Illumination system 11 Illumination light source 12 Condensing lens 13 Aperture 14 Lens units 20, 20a, 20c, 20d, 20e OCT system 21 Interference optical systems 21A, 25A , 26A Optical axis adjustment mechanism 22 Collimator lens 22A Focus adjustment mechanism 23 Optical scanner 24, 24b OCT lens 25 Scanner unit 26 Parallel plane plate 30 Optical path coupling member 40, 40A Deflection member 40a, 40b, 40f Reflective member 40g Beam splitter 70 Objective lens 100, 100a, 100b, 100c, 100d, 100e Attachment for ophthalmic surgery 200 Pre-lens E E Eye to be examined

Claims (13)

An objective lens;
A diaphragm that is irradiated with light including visible light from an illumination light source; and a lens unit that includes one or more lenses that convert the light that has passed through the diaphragm into a parallel light beam, and the light that has passed through the lens unit is the objective lens An illumination system for irradiating the subject's eye via
An observation system for observing the eye being illuminated by the illumination system via the objective lens;
An OCT system for inspecting the eye to be examined through the objective lens by optical coherence tomography;
An optical microscope for ophthalmic surgery, comprising: an optical path coupling member that is disposed between the diaphragm and the lens unit and couples the optical path of the OCT system to the optical path of the illumination system. An objective lens;
A diaphragm that is irradiated with light including visible light from an illumination light source; and a lens unit that includes one or more lenses that convert the light that has passed through the diaphragm into a parallel light beam, and the light that has passed through the lens unit is the objective lens An illumination system for irradiating the subject's eye via
An observation system for observing the eye being illuminated by the illumination system via the objective lens;
An OCT system for inspecting the eye to be examined through the objective lens by optical coherence tomography;
An optical microscope for ophthalmic surgery comprising: an optical path coupling member that is disposed between the lens unit and the objective lens and couples the optical path of the OCT system to the optical path of the illumination system. A deflection member is provided between the optical path coupling member and the objective lens, and deflects the light of the illumination system optical path and the light of the OCT system toward the objective lens. Item 3. The microscope for ophthalmic surgery according to item 1 or item 2. The microscope for ophthalmologic surgery according to claim 3, wherein the deflecting member includes a beam splitter disposed in an optical path of the observation system. The microscope for ophthalmic surgery according to claim 4, wherein the beam splitter coaxially couples the optical path of the observation system and the optical path of the OCT system. The optical axis of the illumination system and the optical axis of the OCT system are arranged so as to be incident at different positions or at different angles on the reflection surface of the deflecting member. The microscope for ophthalmic surgery according to any one of the above. The OCT system is
Of the measurement light and reference light obtained by dividing the light from the OCT light source, the measurement light is emitted, and the reference light and the return light of the measurement light from the eye to be interfered with each other to generate interference light. A collimating lens for making the measurement light emitted from the generating interference optical system a parallel light beam;
An optical scanner that two-dimensionally deflects the measurement light that has been collimated by the collimator lens;
The microscope for ophthalmic surgery according to any one of claims 1 to 6, further comprising an OCT lens disposed between the optical scanner and the optical path coupling member. The microscope for ophthalmic surgery according to claim 7, further comprising a focus adjustment mechanism that moves the collimating lens along an optical axis of the OCT system. An ophthalmic surgical attachment configured to be detachable from the ophthalmic surgical microscope;
The microscope for ophthalmic surgery according to claim 7 or 8, wherein the collimating lens, the optical scanner, the OCT lens, and the optical path coupling member are provided in the attachment for ophthalmic surgery. The ophthalmic surgical microscope according to any one of claims 1 to 9, further comprising an optical axis adjustment mechanism that relatively moves an optical axis of the illumination system and an optical axis of the OCT system. The optical axis adjusting mechanism emits the measurement light out of the measurement light and the reference light obtained by dividing the light from the OCT light source, and returns the reference light and the return light of the measurement light from the eye to be examined. The optical axis of the illumination system and the optical axis of the OCT system are moved relative to each other by changing the direction of the measurement light emitted from an interference optical system that generates interference light by causing the interference to occur. Item 15. The microscope for ophthalmic surgery according to Item 10. An objective lens;
A diaphragm that is irradiated with light including visible light from an illumination light source; and a lens unit that includes one or more lenses that convert the light that has passed through the diaphragm into a parallel light beam, and the light that has passed through the lens unit is the objective lens An illumination system for irradiating the subject's eye via
And an observation system for observing the eye to be inspected illuminated by the illumination system via the objective lens, and configured to be detachable from an ophthalmic surgical microscope, and the eye to be inspected by optical coherence tomography An ophthalmic surgical attachment for inspection through an objective lens,
Of the measurement light and reference light obtained by dividing the light from the OCT light source, the measurement light is emitted, and the reference light and the return light of the measurement light from the eye to be interfered with each other to generate interference light. A collimating lens for making the measurement light emitted from the generating interference optical system a parallel light beam;
An optical scanner that two-dimensionally deflects the measurement light that has been collimated by the collimator lens;
An OCT lens through which the measurement light deflected by the optical scanner passes;
An optical path coupling member for coupling the optical path of the measurement light that has passed through the OCT lens to the optical path of the illumination system,
An attachment for ophthalmic surgery, wherein the optical path coupling member is disposed between the diaphragm and the lens unit when mounted on the microscope for ophthalmic surgery. An objective lens;
A diaphragm that is irradiated with light including visible light from an illumination light source; and a lens unit that includes one or more lenses that convert the light that has passed through the diaphragm into a parallel light beam, and the light that has passed through the lens unit is the objective lens An illumination system for irradiating the subject's eye via
And an observation system for observing the eye to be inspected illuminated by the illumination system via the objective lens, and configured to be detachable from an ophthalmic surgical microscope, and the eye to be inspected by optical coherence tomography An ophthalmic surgical attachment for inspection through an objective lens,
Of the measurement light and reference light obtained by dividing the light from the OCT light source, the measurement light is emitted, and the reference light and the return light of the measurement light from the eye to be interfered with each other to generate interference light. A collimating lens for making the measurement light emitted from the generating interference optical system a parallel light beam;
An optical scanner that two-dimensionally deflects the measurement light that has been collimated by the collimator lens;
An OCT lens through which the measurement light deflected by the optical scanner passes;
An optical path coupling member for coupling the optical path of the measurement light that has passed through the OCT lens to the optical path of the illumination system,
An attachment for ophthalmic surgery, wherein the optical path coupling member is disposed between the lens unit and the objective lens when mounted on the microscope for ophthalmic surgery.

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