JP6818391B2 - Ophthalmic microscope and function expansion unit - Google Patents

Description

The present invention relates to an ophthalmic microscope such as a fundus camera, a slit lamp, and an ophthalmic surgery microscope having an illumination optical system for illuminating the eye to be inspected and an observation optical system for observing the illuminated eye to be inspected. The ophthalmic microscope of the present invention has an OCT optical system capable of obtaining a tomographic image of the eye to be inspected by optical coherence tomography (abbreviated as "OCT"), and has an OCT optical system and an observation optical system. It is characterized by having a configuration that can be independent of and, which can increase the degree of freedom in designing an ophthalmic microscope.
The present invention also relates to a function expansion unit that can be attached to and detached from an ophthalmic microscope and can add an OCT function to an ophthalmic microscope.

An ophthalmic microscope is a medical or examination device capable of illuminating a patient's eye to be inspected with an illumination optical system and magnifying and observing the eye to be inspected by an observation optical system including a lens or the like. Such ophthalmic microscopes have been developed that can obtain a tomographic image of the eye to be inspected by having an OCT optical system.

OCT is a technique for obtaining a tomographic image of a living body by constructing an interferometer using a light source having low coherence (short coherence distance). Specifically, using a light source with low coherence, this light is divided into two by a beam splitter, and one light (measurement light) is irradiated to a living tissue to be reflected or scattered, and the other light (reference light). Is reflected by the mirror. The measurement light is reflected or scattered at various depths of the living tissue, and innumerable reflected or scattered light is returned. When the measurement light returned to the beam splitter and the reflected light of the reference light are merged, only the reflected light or the scattered light of the measurement light that has passed the same distance as the reference light is detected by interfering with the reflected light of the reference light. .. Therefore, by adjusting the positions of the beam splitter and the mirror to change the path length of the reference light in various ways, the intensity of the measured light reflected at various depths of the living tissue can be detected. With such an OCT optical system, a tomographic image of a living tissue can be obtained.
By providing this OCT optical system in an ophthalmic microscope, it is possible to obtain tomographic images of the retina, cornea, iris, etc. of the eye, and it is possible to observe not only the surface of the tissue but also the internal state. As a result, the accuracy of diagnosis of eye diseases can be improved, and the success rate of ophthalmic surgery can be increased.

In an ophthalmic microscope having such an OCT optical system, it is necessary to incorporate the OCT optical system into a microscope having an illumination optical system and an observation optical system so that the light of the OCT optical system can be incident on the eye to be inspected. The method is being developed.
For example, a Galilean telescope having an observation optical system consisting of an observer's left-eye observation optical system and a right-eye observation optical system, and having one objective lens through which the optical axes of the left and right observation optical systems transmit in common. In an ophthalmic microscope, there is a method in which the light of an OCT light source incident from the side of an objective lens is reflected by a reflecting member directly above the objective lens, transmitted through the objective lens, and incident on the eye to be inspected (Patent Document 1 and). 2nd grade).

More specifically, as shown in FIG. 12 (drawing with reference to FIG. 1 of Patent Document 1), the ophthalmic microscope has an optical axis of the observation optical system for the left eye and an optical axis of the observation optical system for the right eye. The optical axis of the observation optical system consisting of paired left and right lens groups (130, 140, 150, 170, 180) and the optical axis of the observation optical system for the left eye and the optical axis of the observation optical system for the right eye are common. It has one objective lens (110), an OCT optical system (200, 250, 450, 460, 470), and an illumination optical system (310, 320, 330). In the OCT optical system, the output light from the OCT light source (200) is emitted through the optical fiber (250), the direction is controlled by the two scanning mirrors (450, 460), and then the beam combiner ( At 340), it merges with the illumination light from the illumination optical system, is reflected by the beam splitter (120), and is incident on the eye to be inspected (1000).

Further, in a Galilean ophthalmic microscope, there is a method in which light from an OCT light source is emitted from an upper part of an objective lens, transmitted through the objective lens, and incident on the eye to be inspected (Patent Document 3).
Further, in a Galilean ophthalmic microscope, there is a method in which the optical path of the OCT optical system is merged substantially coaxially with the optical path of the observation optical system, and is transmitted through an objective lens to be incident on the eye to be inspected (Patent Documents 4 and 5). ).

In all of the above methods, the optical axis of the observation optical system and the optical axis of the OCT optical system commonly pass through one objective lens.

In the Galilean type ophthalmic microscope, as a method in which the optical axis of the OCT optical system does not pass through the objective lens, the light of the OCT light source incident from the side of the objective lens is reflected by a reflecting member directly under the objective lens. There is a method in which the objective lens is incident on the eye to be inspected without being transmitted (Patent Document 6).
More specifically, as shown in FIG. 13 (drawing with reference to FIG. 2A of Patent Document 6), the side of the objective lens is lateral to the lower part of the objective lens (102) through which the optical axis of the observation optical system is transmitted. The light of the OCT light source incident from the above is reflected by the dichroic mirror (400), and the light of the OCT optical system is incident on the eye to be inspected.
In this method, the optical path of the observation optical system and the optical path of the OCT optical system are coaxially merged directly under the objective lens.

In addition, as a method different from the Galilean type ophthalmic microscope, it has two objective lenses corresponding to the left and right observation optical systems, and a stereo angle is provided between the left and right observation optical systems for the Greenough type ophthalmology. There is a microscope (Patent Documents 7 and 8). In the Greenough type ophthalmic microscope, since there is no objective lens that transmits the optical axis of the left and right observation optical systems in common, the optical path of the OCT optical system should be incident on the eye to be inspected without passing through the objective lens. Can be done.
However, in the Greenough type ophthalmic microscope, complicated optical design is required because the left and right observation optical systems are tilted with each other to have a stereo angle.

Japanese Patent Application Laid-Open No. 8-66421 Japanese Unexamined Patent Publication No. 2008-264488 Japanese Unexamined Patent Publication No. 2008-268852 Special Table 2010-522055 Japanese Unexamined Patent Publication No. 2008-264490 U.S. Pat. No. 8,366,271 Japanese Unexamined Patent Publication No. 2016-185177 Japanese Unexamined Patent Publication No. 2016-185178

As described above, conventional ophthalmic microscopes equipped with an OCT optical system include a Galileo type ophthalmic microscope and a Greenough type ophthalmic microscope, but the Greenough type ophthalmic microscope requires a complicated optical design. Met.
Further, in the conventional Galileo type ophthalmic microscope, as shown in Patent Documents 1 to 5, the optical axis of the observation optical system and the optical axis of the OCT optical system commonly transmit one objective lens. Many methods have been developed, but since the observation optical system and the OCT optical system are not independent, the OCT optical system and the observation optical system are influenced by each other, and the degree of freedom in optical design is limited. Met.
In the conventional Galileo type ophthalmic microscope, as shown in Patent Document 6, a method has been developed in which the optical axis of the OCT optical system does not pass through the objective lens, but the optical axis of the observation optical system and the OCT optical system Since the optical axes of the above are coaxially merged directly under the objective lens, optical members for wavelength separation such as a wavelength separation filter and a beam splitter are provided in order to detect the reflected light or the scattered light of the OCT. There was a problem that it was necessary. Further, since the optical member of the OCT optical system is provided between the objective lens and the eye to be inspected, there is a problem that a sufficient distance from the ophthalmic microscope to the eye to be inspected cannot be secured.

Therefore, in view of the above-mentioned conventional situation, it is an object of the present invention to develop a new type ophthalmic microscope that enhances the degree of freedom in optical design in the Galilean type ophthalmic microscope provided with an OCT optical system.

In order to solve the above problems, as a result of diligent research by the inventors of the present application, the optical axis of the OCT optical system does not transmit through the objective lens through which the optical axis of the observation optical system is transmitted in a Galileo type ophthalmic microscope. By arranging the optical axis of the optical system and the optical axis of the OCT optical system so as to be non-coaxial, the observation optical system and the OCT optical system become independent, the degree of freedom in optical design is increased, and the OCT optical system is increased. We have found that it is possible to detachably unitize the optics, and have completed the present invention.

That is, the present invention provides the following first invention relating to an ophthalmic microscope, the following second invention relating to a function expansion unit, and the following third invention relating to a function expansion set.
(1) The first invention includes an illumination optical system for illuminating the eye to be inspected, an observation optical system for the left eye and an observation optical system for the right eye for observing the eye to be inspected illuminated by the illumination optical system. The eye to be inspected is subjected to an observation optical system, an objective lens through which the optical axis of the observation optical system for the left eye and the optical axis of the observation optical system for the right eye of the observation optical system are transmitted in common, and optical coherence stromography. In an ophthalmic microscope having an OCT optical system for inspection
The optical axis of the OCT optical system does not pass through the objective lens through which the optical axis of the observation optical system is transmitted, and the optical axis of the observation optical system and the optical axis of the OCT optical system are non-coaxial. The present invention relates to an ophthalmic microscope, characterized in that the observation optical system, the objective lens, and the OCT optical system are arranged.
(2) In the first invention, the objective lens has a partial shape of a circular lens or a shape in which a notch or a hole is provided in the circular lens.
It is preferable that the optical axis of the OCT optical system passes through a portion where the objective lens does not exist, or a notch or a hole provided in the objective lens.
(3) In any of the ophthalmic microscopes, it is preferable to further have an OCT objective lens through which the optical axis of the OCT optical system is transmitted, in addition to the objective lens.
(4) In the case of (3) above, the circular lens or the lens composed of the circular lens portion is divided into two.
One divided lens is used as the objective lens.
The other divided lens can be used as the OCT objective lens.
(5) In any of the ophthalmic microscopes, it is preferable to further have an objective lens position control mechanism for adjusting the position of the objective lens.
(6) In any of the ophthalmic microscopes, it is preferable that the OCT optical system is detachably unitized.
(7) In any of the ophthalmic microscopes, it is preferable to further have a removable front lens on the optical path between the eye to be inspected and the objective lens in order to observe the retina of the eye to be inspected.
(8) The second invention includes an illumination optical system for illuminating the eye to be inspected, an observation optical system for the left eye and an observation optical system for the right eye for observing the eye to be inspected illuminated by the illumination optical system. A function expansion unit used for an ophthalmic microscope having an optical system and an objective lens in which the optical axis of the observation optical system for the left eye and the optical axis of the observation optical system for the right eye of the observation optical system are commonly transmitted. In
A joint that can be attached to and detached from the ophthalmic microscope
It has an OCT optical system for inspecting the eye to be inspected by optical coherence tomography.
When the function expansion unit is attached to the ophthalmic microscope via the joint portion, the optical axis of the OCT optical system does not transmit the objective lens through which the optical axis of the observation optical system is transmitted, and the observation optical is transmitted. The present invention relates to a function expansion unit characterized in that the optical axis of the system and the optical axis of the OCT optical system are non-coaxial.
(9) The function expansion unit of the second invention preferably has an OCT objective lens through which the optical axis of the OCT optical system is transmitted.
(10) In any of the function expansion units, it is preferable to further have a front lens that can be inserted and removed on the optical path between the eye to be inspected and the objective lens in order to observe the retina of the eye to be inspected.
(11) The third invention provides a function expansion set including the above-mentioned function expansion unit and an interchangeable objective lens for exchanging the objective lens.
(12) In the third invention, the interchangeable objective lens has a partial shape of a circular lens or a shape in which a notch or a hole is provided in the circular lens.
When the objective lens is replaced with the replacement objective lens and the function expansion unit is attached to the ophthalmologic microscope via the joint portion,
It is preferable that the optical axis of the OCT optical system passes through a portion where the replacement objective lens does not exist, or a notch or a hole provided in the replacement objective lens.

In the ophthalmic microscope of the first invention, the optical axis of the OCT optical system does not pass through the objective lens through which the optical axis of the observation optical system passes, and the optical axis of the observation optical system and the optical axis of the OCT optical system are non-coaxial. It has become. With such a configuration, in the ophthalmic microscope of the present invention, the observation optical system and the OCT optical system are independent. Therefore, in the ophthalmic microscope of the present invention, the observation optical system and the OCT optical system can be optically designed without being influenced by each other. Therefore, the ophthalmic microscope of the present invention has a degree of freedom in optical design. It has the effect of increasing.
In the function expansion unit of the second invention and the function expansion set of the third invention, the optical axis of the OCT optical system of the function expansion unit does not pass through the objective lens through which the optical axis of the observation optical system of the ophthalmic microscope is transmitted. , The optical axis of the observation optical system of the ophthalmic microscope and the optical axis of the OCT optical system of the function expansion unit are non-coaxial. With such a configuration, the OCT optical system of the function expansion unit is independent of the observation optical system of the ophthalmic microscope, and has the effect of being able to be unitized and increasing the degree of freedom in optical design. Further, since the function expansion unit can be attached to and detached from the ophthalmic microscope via the joint portion, the function expansion unit and the function expansion set of the present invention can easily add the OCT function to the ophthalmic microscope. It works.

It is a drawing which shows typically the structure of the optical system as a side view with respect to the ophthalmic microscope of 1st Embodiment of this invention. It is a drawing which shows typically the structure of the optical system with respect to the ophthalmic microscope of 1st Embodiment of this invention as seen from the front. It is a drawing which shows typically the optical structure of the OCT unit used in the ophthalmic microscope of the 1st Embodiment of this invention. It is a drawing which shows typically the shape of the objective lens used in the ophthalmic microscope of 1st Embodiment of this invention. FIG. 4A is a drawing seen from the direction of the optical axis of the objective lens, and FIG. 4B is a drawing seen from the side surface. It is a drawing which shows typically the shape of the objective lens used in the ophthalmic microscope of the 2nd Embodiment of this invention. FIG. 5A is a drawing seen from the direction of the optical axis of the objective lens, and FIG. 5B is a drawing seen from the side surface. It is a drawing which shows typically the structure of the optical system as a side view with respect to the ophthalmic microscope of the 2nd Embodiment of this invention. It is a drawing which shows typically the shape of the objective lens used in the ophthalmic microscope of the 3rd Embodiment of this invention. FIG. 7A is a view seen from the direction of the optical axis of the objective lens, and FIG. 7B is a view seen from the side surface. It is a drawing which shows typically the shape of the objective lens used in the ophthalmic microscope of the 4th Embodiment of this invention. FIG. 8A is a view seen from the direction of the optical axis of the objective lens, and FIG. 8B is a view seen from the side surface. It is a drawing which shows typically the shape of the objective lens used in the ophthalmic microscope of the 5th Embodiment of this invention. FIG. 9A is a view seen from the direction of the optical axis of the objective lens, and FIG. 9B is a view seen from the side surface. It is a drawing which shows typically the shape of the objective lens used in the ophthalmic microscope of the 6th Embodiment of this invention. FIG. 10A is a view seen from the direction of the optical axis of the objective lens, and FIG. 10B is a view seen from the side surface. It is a drawing which shows typically the shape of the objective lens used in the ophthalmologic microscope of the 7th Embodiment of this invention. FIG. 11A is a view seen from the direction of the optical axis of the objective lens, and FIG. 11B is a view seen from the side surface. It is a drawing which cites FIG. 1 of Patent Document 1. FIG. 6 of Patent Document 6. It is a drawing which quoted 2A.

1. 1. Ophthalmic microscope 1-1. Outline of the Ophthalmic Microscope of the Present Invention The ophthalmic microscope of the present invention includes an illumination optical system for illuminating the eye to be inspected, an observation optical system for the left eye and an observation optical system for the right eye for observing the eye to be inspected illuminated by the illumination optical system. An observation optical system having an observation optical system, an objective lens through which the optical axis of the observation optical system for the left eye and the optical axis of the observation optical system for the right eye of the observation optical system are transmitted in common, and an eye to be inspected by optical coherence stromography. It relates to an ophthalmic microscope having an OCT optical system for inspecting.

In the ophthalmic microscope of the present invention, the optical axis of the OCT optical system does not pass through the objective lens through which the optical axis of the observation optical system is transmitted, and the optical axis of the observation optical system and the optical axis of the OCT optical system are non-coaxial. As described above, the observation optical system, the objective lens, and the OCT optical system are arranged. With such a configuration, in the ophthalmic microscope of the present invention, the observation optical system and the OCT optical system are independent.
Therefore, in the ophthalmic microscope of the present invention, the observation optical system and the OCT optical system can be optically designed without being influenced by each other. Therefore, the ophthalmic microscope of the present invention has a degree of freedom in optical design. It has the effect of increasing.
For example, although not limited to these, in addition to the objective lens of the observation optical system, an OCT objective lens is also provided in the OCT optical system, and the position of each objective lens is controlled independently to perform observation optics. An optical design that independently adjusts the focal point of the system and the focal point of the OCT optical system becomes possible. It is also possible to design an optical system in which the OCT optical system is separated from the observation optical system so that the OCT optical system can be attached to and detached from an ophthalmic microscope. Further, it is possible to add not only one OCT optical system but also a plurality of OCT optical systems to an ophthalmic microscope to perform an optical design capable of obtaining a three-dimensional tomographic image in more detail.

In the present invention, the "ophthalmic microscope" refers to a medical or examination device capable of magnifying and observing an eye to be inspected, including not only for humans but also for animals. The “ophthalmic microscope” includes, but is not limited to, a fundus camera, a slit lamp, a microscope for ophthalmic surgery, and the like.

In the present invention, the "illumination optical system" is configured to include an optical element for illuminating the eye to be inspected. The illumination optical system may further include a light source, but may be one that guides natural light to the eye to be inspected.
Further, in the present invention, the "observation optical system" includes an optical element capable of observing the eye to be inspected by the return light reflected and scattered from the eye to be inspected illuminated by the illumination optical system. It is a thing. In the present invention, the observation optical system includes an observation optical system for the left eye and an observation optical system for the right eye, and when parallax is generated in the images obtained by the left and right observation optical systems, binocular vision is used. It is also possible to observe three-dimensionally.
Further, the "observation optical system" of the present invention may be one in which the eye to be inspected can be observed by the naked eye of the observer through an eyepiece, an eyepiece, or the like, and can be observed by receiving light from an image pickup element or the like and imaging it. It may be capable, or it may have both functions.

In the present invention, the "OCT optical system" is configured to include an optical element that allows OCT measurement light or reference light to pass through. The OCT optical system can further include an OCT light source.
In the present invention, the optical elements used in the "illumination optical system", "observation optical system", and "OCT optical system" are not limited to these, but are, for example, lenses, prisms, mirrors, and optical filters. , Aperture, diffraction grating, polarizing element and the like can be used.

In the present invention, the "objective lens" refers to a lens provided on the side of the eye to be inspected in an ophthalmic microscope. The front lens (loupe) that is temporarily inserted between the objective lens and the eye to be inspected is not included in the "objective lens" in the present invention.
In the present invention, when the optical axis of the observation optical system and the optical axis of the OCT optical system are "non-coaxial", it means that the directions of the optical axes are not the same.

1-2. First Embodiment Hereinafter, examples of the embodiment of the present invention will be described in detail with reference to the drawings.
1 to 4 are drawings schematically showing a first embodiment which is an example of an ophthalmic microscope of the present invention. FIG. 1 is a schematic view showing the configuration of the optical system of the ophthalmic microscope of the first embodiment as viewed from the side, and FIG. 2 is a schematic view showing the configuration as viewed from the front. Further, FIG. 3 is a drawing schematically showing the optical configuration of the OCT unit, and FIG. 4 is a drawing schematically showing the shape of the objective lens.

As shown in FIG. 1, the optical system of the ophthalmic microscope (1) includes an objective lens (2), an illumination optical system (300), an observation optical system (400), and an OCT optical system (500). doing.
The objective lens (2), the illumination optical system (300), and the observation optical system (400) are housed in the ophthalmic microscope main body (6). On the other hand, the OCT optical system (500) is housed in the function expansion unit (7). In FIG. 1, the ophthalmic microscope main body (6) and the function expansion unit (7) are shown by alternate long and short dash lines.
The main body of the ophthalmic microscope (6) and the function expansion unit (7) are detachably connected by a joint portion (not shown).

As shown in FIG. 1, the illumination optical system (300) illuminates the eye to be inspected (8) via the objective lens (2). The illumination optical system (300) includes an illumination light source (9), an optical fiber (301), an exit diaphragm (302), a condenser lens (303), an illumination field diaphragm (304), a collimating lens (305), and a reflection mirror (30). 306) is included in the configuration. The optical axis of the illumination optical system (300) is shown by a dotted line (O-300) in FIG.

The illumination light source (9) is provided outside the main body of the ophthalmic microscope (6). One end of the optical fiber (301) is connected to the illumination light source (9). The other end of the optical fiber is arranged at a position facing the condenser lens (303) inside the main body of the ophthalmic microscope (6). The illumination light output from the illumination light source (9) is guided by the optical fiber (301) and incident on the condenser lens (303).
An exit aperture diaphragm (302) is provided at a position facing the exit port (fiber end on the condenser lens (303) side) of the optical fiber (301). The exit aperture diaphragm (302) acts to block a part of the exit port of the optical fiber (301). When the blocking area by the emission port diaphragm (302) is changed, the emission area of the illumination light is changed. Thereby, the irradiation angle by the illumination light, that is, the angle formed by the incident direction of the illumination light with respect to the eye to be inspected (8) and the optical axis of the objective lens (2) can be changed.

The illumination field diaphragm (304) is provided at a position (x position) optically conjugate with the front focal position (U0) of the objective lens (2). The collimating lens (305) converts the illumination light that has passed through the illumination field diaphragm (304) into a parallel luminous flux. The reflection mirror (306) reflects the illumination light converted into a parallel luminous flux by the collimating lens (305) toward the objective lens (2). The reflected light passes through the objective lens (2) and is applied to the eye to be inspected (8).
The illumination light (a part of) irradiated to the eye to be inspected (8) is reflected and scattered by the tissue of the eye to be inspected such as the cornea and the retina. The reflected / scattered return light (also referred to as “observation light”) passes through the objective lens (2) and enters the observation optical system (400).

As shown in FIG. 1, the observation optical system (400) includes a variable magnification lens system (401), a beam splitter (402), an imaging lens (403), an image erecting prism (404), and an eye width adjusting prism (404). 405), a field diaphragm (406), and an eyepiece (407) are included. The optical axis of the observation optical system (400) is shown by a dotted line (O-400) in FIG.
The observation optical system (400) is used for observing the eye to be inspected (8) illuminated by the illumination optical system (300) through the objective lens (2).

As shown in FIG. 1, the OCT optical system (500) includes an OCT unit (10), an optical fiber (501), a collimating lens (502), an illumination field diaphragm (509), an optical scanner (503a, 503b), and a relay. It includes an optical system (504), a first lens group (505), a second lens group (506), and an OCT objective lens (507).
The optical axis of the OCT optical system (500) is shown by a dotted line (O-500) in FIG.
As shown in FIG. 1, in the first embodiment, the optical axis (O-500) of the OCT optical system does not pass through the objective lens (2), and the optical axis (O-400) of the observation optical system is not transmitted. ) And the optical axis (O-500) of the OCT optical system are non-coaxial, so that the OCT optical system and the observation optical system are independent.

The OCT unit (10) divides the light from the OCT light source having low coherence (short coherence distance) into the measurement light and the reference light. The measurement light is guided by the OCT optical system (500) and irradiated to the eye to be inspected (8), is reflected and scattered in the tissue of the eye to be inspected, and is guided to the OCT unit (10) as return light. The OCT unit (10) detects the interference between the return light of the measurement light and the reference light. As a result, a tomographic image of the tissue of the eye to be inspected can be obtained.

As shown in FIG. 1, the OCT unit (10) is provided outside the function expansion unit (7), but one end of the optical fiber (501) is connected to the function expansion unit (7). ) Is connected. The measurement light generated by the OCT unit (10) is emitted from the other end of the optical fiber (501). The emitted measurement light includes a collimating lens (502), an illumination field aperture (509), an optical scanner (503a, 503b), a relay optical system (504), a first lens group (505), and a second lens group (506). The return light of the measurement light that is irradiated to the test eye (8) via the OCT objective lens (507) and is reflected and scattered by the tissue of the test eye (8) travels in the same path in the opposite direction. It is incident on the other end of the fiber (501).

When observing the retina of the fundus, a front lens (14) is inserted on the optical axes O-300, O-400, and O-500 in front of the eye to be inspected by a moving means (not shown). In this case, the anterior focal position (U0) of the objective lens (2) is conjugate with the retina of the fundus.
When observing the anterior segment of the cornea, iris, etc., the anterior lens is detached from the front of the eye to be inspected for observation.

As shown in FIG. 1, the collimating lens (502) converts the measurement light emitted from the other end of the optical fiber (501) into a parallel luminous flux. The collimating lens (502) and the other end of the optical fiber (501) are configured to be relatively movable along the optical axis of the measurement light. In the first embodiment, the collimating lens (502) is configured to be movable, but the other end of the optical fiber (501) may be configured to be movable along the optical axis of the measurement light.
The illumination field diaphragm (509) is conjugate with the front focal position (U0) of the objective lens (2).

The optical scanners (503a, 503b) in the OCT optical system two-dimensionally deflect the measurement light converted into a parallel luminous flux by the collimating lens (502). For the optical scanners (503a, 503b), a deflection member configured to be rotatable around each of the two axes that intersect differently is used. Examples of the deflecting member include a galvano mirror, a polygon mirror, a rotating mirror, a MEMS (Micro Electro Mechanical Systems) mirror, and the like. In the first embodiment, the optical scanners (503a, 503b) are configured to include a galvano mirror. That is, the optical scanner has a first scanner (503a) having a deflection surface rotatable about the first axis and a second scanner having a deflection surface rotatable about a second axis orthogonal to the first axis. Includes a scanner (503b). A relay optical system (504) is provided between the first scanner (503a) and the second scanner (503b).

The first lens group (505) includes one or more lenses. The second lens group (506) is also configured to include one or more lenses.
Further, an OCT objective lens (507) is provided on the side in contact with the eye to be inspected (8).
The OCT objective lens is configured to be movable along the optical axis, and the focus of the OCT optical system can be adjusted by controlling the position of the OCT objective lens. This makes it possible to adjust the focal point of the OCT optical system to a position different from the focal point of the observation optical system.

As described above, in the ophthalmic microscope of the first embodiment, the optical axis (O-500) of the OCT optical system does not pass through the objective lens (2), and the optical axis (O-400) of the observation optical system. And the optical axis (O-500) of the OCT optical system are non-coaxial, so that the observation optical system and the OCT optical system are independent.
Therefore, in the ophthalmic microscope of the first embodiment, the observation optical system and the OCT optical system can be controlled independently, and the OCT optical system can be attached to and detached from the ophthalmic microscope. It is also possible to do.

The ophthalmic microscope of the first embodiment will be described in detail with reference to the drawings.
FIG. 2 is a schematic view showing the configuration of the optical system of the ophthalmic microscope of the first embodiment as viewed from the front.
As shown in FIG. 2, the observation optical system is divided into an observation optical system for the left eye of the observer (400L) and an observation optical system for the right eye (400R), each of which has an observation optical path. There is. The optical axes of the left and right observation optical systems are shown by dotted lines (O-400L, O-400R) in FIG. 2, respectively.

As shown in FIG. 2, the left and right observation optical systems (400L, 400R) are a variable magnification lens system (401), an imaging lens (403), an image erecting prism (404), and an eye width adjusting prism (404), respectively. 405), a field diaphragm (406), and an eyepiece lens (407) are included. The beam splitter (402) is included only in the observation optical system 400R for the right eye.
The variable magnification lens system (401) is configured to include a plurality of zoom lenses (401a, 401b, 401c). Each zoom lens (401a, 401b, 401c) can be moved along the optical axes (O-400L, O-400R) of the left and right observation optical systems by a scaling mechanism (not shown). As a result, the magnification when observing or photographing the eye to be inspected (8) is changed.

As shown in FIG. 2, the beam splitter (402) of the observation optical system for the right eye (400R) is a part of the observation light guided from the eye to be inspected (8) along the observation optical system for the right eye. Is separated and led to the imaging optical system. The photographing optical system includes an imaging lens (1101), a reflection mirror (1102), and a television camera (1103).
The television camera (1103) includes an image sensor (1103a). The image sensor (1103a) is composed of, for example, a CCD (Charge Coupled Devices) image sensor, a CMOS (Complementary Metal Oxide Semiconductor) image sensor, or the like. As the image pickup device (1103a), one having a two-dimensional light receiving surface (area sensor) is used.
When using the ophthalmic microscope (1), the light receiving surface of the image sensor (1103a) is arranged at a position optically conjugate with, for example, the surface of the cornea or retina of the eye to be inspected (8).

The image erecting prism (404) converts the inverted image into an erect image. The eye width adjusting prism (405) is an optical element for adjusting the distance between the left and right observation optical paths according to the eye width (distance between the left eye and the right eye) of the observer. The visual field diaphragm (406) limits the observer's visual field by blocking the peripheral region in the cross section of the observation light. The field diaphragm (406) is provided at a position (X position) conjugate with the front focal position (U0) of the objective lens (2).
The observation optical system (400L, 400R) may be configured to include a stereo variator configured to be removable from the optical path of the observation optical system. The stereo variator is an optical axis position changing element for changing the relative positions of the optical axes (O-400L, O-400R) of the left and right observation optical systems guided by the left and right variable magnification lens systems (401), respectively. is there. The stereo variator is retracted to, for example, a retracted position provided on the observer side with respect to the observation optical path.

In the ophthalmic microscope of the first embodiment, in addition to the observation optical system used by the main observer, a sub-observation optical system (400S) for use by the assistant observer is provided.
As shown in FIG. 2, the sub-observation optical system (400S) transmits the return light (observation light) reflected and scattered by the eye to be inspected (8) illuminated by the illumination optical system via the objective lens (2). Then, it leads to the assistant eyepiece (411). The optical axis of the sub-observation optical system is shown by a dotted line (O-400S) in FIG.
The sub-observation optical system (400S) is also provided with a pair of left and right optical systems, which enables stereoscopic observation by binoculars.

As shown in FIG. 2, the sub-observation optical system (400S) includes a prism (408), a reflection mirror (410), and an assistant eyepiece (411). In the first embodiment, an imaging lens (409) is further arranged between the prism (408) and the reflection mirror (410). The observation light from the eye to be inspected (8) passes through the objective lens (2) and is reflected by the reflecting surface (408a) of the prism (408). The observation light reflected by the reflecting surface (408a) passes through the imaging lens (409), is reflected by the reflecting mirror (410), and is guided to the assistant eyepiece (411).
The observation optical system (400L, 400R) and the sub-observation optical system (400S) are housed in the ophthalmic microscope main body (6).

When observing the retina of the fundus, a front lens (14) is inserted on the optical axes O-300, O-400, and O-500 in front of the eye to be inspected by a moving means (not shown). In this case, the anterior focal position (U0) of the objective lens (2) is conjugate with the retina of the fundus.
When observing the anterior segment of the cornea, iris, etc., the anterior lens is detached from the front of the eye to be inspected for observation.

FIG. 3 is a drawing schematically showing an optical configuration of an OCT unit (10) used in the ophthalmic microscope of the first embodiment.
As shown in FIG. 3, the OCT unit (10) divides the light emitted from the OCT light source unit (1001) into a measurement light (LS) and a reference light (LR), and the measurement light (LR) passing through another optical path. It constitutes an interferometer that detects the interference between the LS) and the reference light (LR).
The OCT light source unit (1001) is configured to include a wavelength scanning type (wavelength sweep type) light source capable of scanning (sweeping) the wavelength of emitted light, similar to a general swept source type OCT device. The OCT light source unit (1001) changes the output wavelength with time at a near-infrared wavelength that is invisible to the human eye. The light output from the OCT light source unit (1001) is indicated by reference numeral L0.

The light L0 output from the OCT light source unit (1001) is guided by the optical fiber (1002) to the polarization controller (1003) to adjust its polarization state. The polarization controller (1003) adjusts the polarization state of the light L0 guided in the optical fiber (1002) by, for example, applying stress from the outside to the looped optical fiber (1002).
The light L0 whose polarization state is adjusted by the polarization controller (1003) is guided by the optical fiber (1004) to the fiber coupler (1005) and divided into the measurement light (LS) and the reference light (LR).

As shown in FIG. 3, the reference light (LR) is guided by the optical fiber (1006) to the collimator (1007) to become a parallel luminous flux. The reference light LR that has become a parallel luminous flux is guided to the corner cube (1010) via the optical path length correction member (1008) and the dispersion compensation member (1009). The optical path length correction member (1008) acts as a delay means for matching the optical path lengths (optical distances) of the reference light (LR) and the measurement light (LS). The dispersion compensating member (1009) acts as a dispersion compensating means for matching the dispersion characteristics of the reference light (LR) and the measurement light (LS).
The corner cube (1010) turns back the traveling direction of the reference light (LR) which has become a parallel luminous flux by the collimator (1007) in the opposite direction. The optical path of the reference light (LR) incident on the corner cube (1010) is parallel to the optical path of the reference light (LR) emitted from the corner cube (1010). Further, the corner cube (1010) is movable in the direction along the incident optical path and the outgoing optical path of the reference light (LR). This movement changes the length of the optical path (reference optical path) of the reference light (LR).

As shown in FIG. 3, the reference light (LR) passing through the corner cube (1010) passes through the dispersion compensating member (1009) and the optical path length correction member (1008), and is focused from the parallel light beam by the collimator (1011). It is converted into a light beam, incident on the optical fiber (1012), and guided by the polarization controller (1013) to adjust the polarization state of the reference light (LR).
The polarization controller (1013) has, for example, the same configuration as the polarization controller (1003). The reference light LR whose polarization state is adjusted by the polarization controller (1013) is guided to the attenuator (1015) by the optical fiber (1014), and the amount of light is adjusted under the control of the arithmetic control unit (12). The reference light (LR) whose light amount is adjusted by the attenuator (1015) is guided to the fiber coupler (1017) by the optical fiber (1016).

As can be seen from FIGS. 1 and 3, the measurement light (LS) generated by the fiber coupler (1005) is guided to the collimating lens (502) by the optical fiber (501). As shown in FIG. 1, the measurement light incident on the collimating lens (502) includes an optical scanner (503a, 503b), a relay optical system (504), a first lens group (505), and a second lens group (506). , And the eye to be inspected (8) is irradiated via the objective lens (507) for OCT. The measurement light is reflected and scattered at various depth positions of the eye to be inspected (8). The backscattered light of the light measured by the eye to be inspected (8) travels in the same direction as the outward path in the opposite direction, is guided to the fiber coupler (1005), and passes through the optical fiber (1018) as shown in FIG. Then, it reaches the fiber coupler (1017).

The fiber coupler (1017) synthesizes (interferes) the measurement light (LS) incidented via the optical fiber (1018) with the reference light (LR) incident via the optical fiber (1016). ) Generates interference light. The fiber coupler (1017) generates a pair of interference lights (LC) by branching the interference light between the measurement light (LS) and the reference light (LR) at a predetermined branching ratio (for example, 50:50). .. The pair of interference lights (LC) emitted from the fiber coupler (1017) are guided to the detector (1021) by two optical fibers (1019, 1020), respectively.

The detector (1021) has, for example, a pair of photodetectors that detect each pair of interference lights (LC), and a balanced photodiode (hereinafter referred to as "BPD") that outputs the difference between the detection results. ). The detector (1021) sends the detection result (detection signal) to the arithmetic control unit (12). The arithmetic control unit (12) forms a cross-sectional image by, for example, performing a Fourier transform or the like on the spectrum distribution based on the detection result obtained by the detector (1021) for each series of wavelength scans (for each A line). To do. The arithmetic control unit (12) causes the displayed image (13) to display the formed image.

In this embodiment, a Michelson type interferometer is adopted, but any type of interferometer such as a Mach-Zehnder type can be appropriately adopted.

FIG. 4 is a schematic view showing the shape of the objective lens used in the ophthalmic microscope of the first embodiment. FIG. 4A is a view seen from the direction of the optical axis of the objective lens, and FIG. 4B is a view seen from the side surface.
As shown in FIG. 4A, the planar shape of the objective lens (2) is circular. Then, in the microscope of the first embodiment, the optical path of the observation optical system for the left eye (P-400L), the optical path of the observation optical system for the right eye (P-400R), and the optical path of the illumination optical system (P-300). ) Are transmitted through different parts of the objective lens (2). Further, although not shown, the optical path of the sub-observation optical system is transmitted in the vicinity of the optical path (P-400L) of the observation optical system for the left eye.
Next, as shown in FIG. 4B, the side surface shape of the objective lens (2) is convex, and is a convex lens.

1-3. Shape of Objective Lens As the objective lens used in the ophthalmic microscope of the present invention, a circular lens can be used as in the first embodiment.
However, in the present invention, it is preferable to reduce the angle formed by the optical axis of the OCT optical system and the optical axis of the observation optical system, and for that purpose, an objective lens having a partial shape of a circular lens or a circular lens is used. It is preferable to use an objective lens having a shape having a notch or a hole.

In the present invention, the "partial shape of a circular lens" refers to a shape obtained by cutting out a part of a circular lens when viewed in a plane from the optical axis direction of the lens, and is not limited to these, but for example, the left. A lens having a semicircular shape, a fan shape, a rectangular shape, or the like can be used so that the optical path of the observation optical system for the eye and the optical path of the observation optical system for the right eye are transmitted.
Further, in the present invention, the "shape in which a notch or a hole is provided in a circular lens" means a shape in which a notch or a hole is provided when viewed in a plan view from the optical axis direction of the lens, and is limited to these. However, for example, a lens having a shape in which a notch or a hole is provided in a portion through which the optical path of the OCT optical system is transmitted can be used.

By using a lens having such a shape, the optical path of the OCT optical system can pass through a portion of the circular lens in which the cut lens does not exist, or a notch or a hole provided in the lens. As a result, the angle formed by the optical axis of the OCT optical system and the optical axis of the observation optical system can be reduced without the optical axis of the OCT optical system passing through the objective lens.
In the present invention, the angle formed by the optical axis of the OCT optical system and the optical axis of the observation optical system (either the optical axis of the left or right observation optical path) is preferably 1 to 15 °, and more preferably. It is preferably 4 to 10 °, and more preferably 6 to 8 °.

In the ophthalmic microscope of the present invention, a circular lens or a lens composed of a circular lens portion is divided into two, and one of the divided lenses is used as an objective lens through which the optical axis of the observation optical system is transmitted, and the other is divided. The lens can be an objective lens through which the optical axis of the OCT optical system is transmitted.
Here, as the "lens composed of a circular lens portion", a lens having the above-mentioned "partial shape of a circular lens" can be used.
If such a divided lens is used and the position of each lens can be controlled independently, the observation optical system and the OCT optical system can be controlled independently.

1-4. Second Embodiment Hereinafter, examples of other embodiments of the present invention will be described in detail with reference to the drawings.
5 and 6 are drawings schematically showing a second embodiment which is another example of the ophthalmic microscope of the present invention.
FIG. 5 is a schematic view showing the shape of the objective lens used in the ophthalmic microscope of the second embodiment. FIG. 5A is a view seen from the direction of the optical axis of the objective lens, and FIG. 5B is a view seen from the side surface.
FIG. 6 is a schematic view showing the configuration of the optical system of the ophthalmic microscope of the second embodiment as viewed from the side.

As shown in FIG. 5 (A), the objective lens (2) used in the second embodiment has a partial shape obtained by cutting out a part of the circular lens, and has an optical path of the observation optical system for the left eye. The optical path (P-400L), the optical path of the observation optical system for the right eye (P-400R), and the optical path of the illumination optical system (P-300) pass through different parts of the objective lens (2). Then, the optical path (P-500) of the OCT optical system passes in the vicinity of the objective lens (2).
Further, as shown in FIG. 5B, the side surface shape of the objective lens (2) is a partial shape obtained by cutting out a part of the convex lens.

As shown in FIG. 6, in the ophthalmic microscope of the second embodiment, the objective lens housed inside the microscope main body (6) is replaced with the objective lens (2) having the shape shown in FIG. ing.
The OCT optical system (500) housed inside the function expansion unit (7) includes an OCT unit (10), an optical fiber (501), a collimating lens (502), an illumination field diaphragm (509), and an optical scanner (503a, In addition to the 503b), the relay optical system (504), the first lens group (505), the second lens group (506), and the OCT objective lens (507), a reflection mirror (508) is further included. ..
Then, when the function expansion unit (7) is attached to the microscope main body (6) via a joint portion (not shown), the OCT objective lens (507) and the reflection mirror (508) are the lenses of the objective lens (2). It is inserted at the top of the cut-out part of. The light (0-500) of the OCT optical system is reflected by the reflection mirror (508), passes through the OCT objective lens (507), and is irradiated to the eye to be inspected (8).

When observing the retina of the fundus, a front lens (14) is inserted on the optical axes O-300, O-400, and O-500 in front of the eye to be inspected by a moving means (not shown). In this case, the anterior focal position (U0) of the objective lens (2) is conjugate with the retina of the fundus.
When observing the anterior segment of the cornea, iris, etc., the anterior lens is detached from the front of the eye to be inspected for observation.

In the second embodiment, the angle formed by the optical axis of the OCT optical system and the optical axis of the observation optical system can be reduced as compared with the first embodiment.

1-5. Third Embodiment The shape of the objective lens used in the third embodiment, which is another example of the ophthalmic microscope of the present invention, is shown in FIG. FIG. 7A is a view seen from the direction of the optical axis of the objective lens, and FIG. 7B is a view seen from the side surface.
As shown in FIG. 7A, the objective lens (2) used in the third embodiment has a shape in which a notch is provided in a part of the circular lens. Then, the optical path (P-500) of the OCT optical system passes through the notched portion.

1-6. Fourth Embodiment The shape of the objective lens used in the fourth embodiment, which is another example of the ophthalmic microscope of the present invention, is shown in FIG. FIG. 8A is a view seen from the direction of the optical axis of the objective lens, and FIG. 8B is a view seen from the side surface.
As shown in FIG. 8A, the objective lens (2) used in the fourth embodiment has a shape obtained by cutting out a part of a circular lens into a rectangular shape, and is an observation optical system for the left eye. The optical path (P-400L) and the optical path (P-400R) of the observation optical system for the right eye pass through different parts of the objective lens (2). Then, the optical path (P-500) of the OCT optical system and the optical path (P-300) of the illumination optical system pass in the vicinity of the objective lens (2).
Further, as shown in FIG. 8B, the side surface shape of the objective lens (2) is a partial shape obtained by cutting out a part of the convex lens.

1-7. Fifth Embodiment The shape of the objective lens used in the fifth embodiment, which is another example of the ophthalmic microscope of the present invention, is shown in FIG. FIG. 9A is a view seen from the direction of the optical axis of the objective lens, and FIG. 9B is a view seen from the side surface.
As shown in FIG. 9A, the objective lens (2) used in the fifth embodiment has a shape in which a part of the circular lens is cut out in a semicircular shape, and is an observation optical system for the left eye. The optical path (P-400L), the optical path of the observation optical system for the right eye (P-400R), and the optical path of the illumination optical system (P-300) pass through different parts of the objective lens (2). Then, the optical path (P-500) of the OCT optical system passes in the vicinity of the objective lens (2).
Further, as shown in FIG. 9B, the side surface shape of the objective lens (2) is a partial shape obtained by cutting out a part of the convex lens.

1-8. Sixth Embodiment The shape of the objective lens used in the sixth embodiment, which is another example of the ophthalmic microscope of the present invention, is shown in FIG. FIG. 10A is a view seen from the direction of the optical axis of the objective lens, and FIG. 10B is a view seen from the side surface.
As shown in FIG. 10 (A), the objective lens (2) used in the sixth embodiment has a shape in which a part of a circular lens is cut out in a crescent shape, and is an observation optical system for the left eye. The optical path (P-400L), the optical path of the observation optical system for the right eye (P-400R), and the optical path of the illumination optical system (P-300) pass through different parts of the objective lens (2). Then, the optical path (P-500) of the OCT optical system passes in the vicinity of the objective lens (2).
Further, as shown in FIG. 10B, the side surface shape of the objective lens (2) is a partial shape obtained by cutting out a part of the convex lens.

1-9. Seventh Embodiment The shape of the objective lens used in the seventh embodiment, which is another example of the ophthalmic microscope of the present invention, is shown in FIG. FIG. 11A is a view seen from the direction of the optical axis of the objective lens, and FIG. 11B is a view seen from the side surface.
As shown in FIG. 11A, the objective lens (2) used in the seventh embodiment has a shape in which a hole (201) is provided in the center of the circular lens. Then, the optical path (P-500) of the OCT optical system passes through the hole.
By providing the holes in this way, it is possible to irradiate the OCT optical system from the center of the objective lens without passing through the objective lens.

2. 2. Function expansion unit The function expansion unit of the present invention can be attached to and detached from an ophthalmic microscope, and the function of OCT can be added to the ophthalmic microscope.
The function expansion unit of the present invention includes an illumination optical system that illuminates the eye to be inspected, and an optical path of an observation optical system for the left eye and an observation optical system for the right eye for observing the eye to be inspected illuminated by the illumination optical system. Used for an ophthalmic microscope having an observation optical system having the above, and an objective lens in which the optical axis of the observation optical system for the left eye and the optical axis of the observation optical system for the right eye of the observation optical system are commonly transmitted. It is a thing.
The function expansion unit of the present invention includes a joint portion that can be attached to and detached from the ophthalmic microscope.
It has an OCT optical system for inspecting the eye to be inspected by optical coherence tomography.
When the function expansion unit is attached to the ophthalmic microscope via the joint portion, the optical axis of the OCT optical system does not transmit the objective lens through which the optical axis of the observation optical system is transmitted, and the observation optical is transmitted. The optical axis of the system and the optical axis of the OCT optical system are non-coaxial.

The OCT optical system of the function expansion unit of the present invention is independent of the observation optical system of the ophthalmic microscope, and has the effect of enabling unitization and increasing the degree of freedom in optical design. Further, since the function expansion unit of the present invention can be attached to and detached from the ophthalmic microscope via the joint portion, there is an effect that the function of OCT can be easily added to the ophthalmic microscope.

The "joint portion" of the function expansion unit of the present invention is not particularly limited as long as the function expansion unit and the ophthalmologic microscope can be attached to and detached from each other, and is not limited thereto. It can be a joint part that is connected by matching or a joint part that is connected by using screws.

Specific examples of the function expansion unit of the present invention include the function expansion unit (enclosed by the alternate long and short dash line indicated by reference numeral 7 in FIGS. 1 and 6) in the ophthalmic microscope of the first embodiment and the ophthalmic microscope of the second embodiment. It is as described as the part).

3. 3. Function expansion set The function expansion set of the present invention is described in 2. The function expansion unit described in the above and an interchangeable objective lens for exchanging the objective lens of the ophthalmic microscope are included, and these are a set.
Here, as the replacement objective lens, the above 1-3. An objective lens having the shape described in 1 can be used.
As a specific example of the interchangeable objective lens, the objective lens (FIGS. 5 and 7 to 11) used in the second to seventh embodiments can be used.

Since the function expansion unit of the present invention can be attached to and detached from the ophthalmic microscope via the joint portion, the function of OCT can be easily added to the ophthalmic microscope.

The ophthalmic microscope, function expansion unit, and function expansion set of the present invention are useful in the industry for manufacturing ophthalmic medical devices.

The reference numerals used in FIGS. 1 to 11 indicate the following.
1 Ophthalmic microscope 2 Objective lens 300 Illumination optics 301 Optical fiber 302 Emission light aperture 303 Condenser lens 304 Illumination field aperture 305 Collimating lens 306 Reflection mirror 400 Observation optical system 400L Observation optical system for left eye 400R Observation optics for right eye System 400S Sub-observation optical system 401 Variable magnification lens system 401a, 401b, 401c Zoom lens 402 Beam splitter 403 Imaging lens 404 Image erecting prism 405 Eye width adjustment prism 406 Field aperture 407 Eyepiece lens 408 Prism 408a Prism reflection surface 409 connection Image Lens 410 Reflective Mirror 411 Assistant Eyepiece 500 OCT Optical System 501 Optical Fiber 502 Collimated Lens 503a, 503b Optical Scanner 504 Relay Optical System 505 First Lens Group 506 Second Lens Group 507 OCT Objective Lens 508 Reflective Mirror 509 Illumination Field Aperture 6 Ophthalmic microscope body 7 Function expansion unit 8 Eye to be inspected 9 Illumination light source 10 OCT unit 1001 OCT light source unit 1002 Optical fiber 1003 Polarization controller 1004 Optical fiber 1005 Fiber coupler 1006 Optical fiber 1007 Collimeter 1008 Optical path length correction member 1009 Dispersion compensation member 1010 Corner Cube 1011 Collimeter 1012 Optical Fiber 1013 Polarization Controller 1014 Optical Fiber 1015 Attenuator 1016 Optical Fiber 1017 Fiber Coupler 1018 Optical Fiber 1019 Optical Fiber 1020 Optical Fiber 1021 Detector 1101 Imaging Lens 1102 Reflection Mirror 1103 TV Camera 1103a Imaging Element 12 Calculation Control unit 13 Display unit 14 Front lens O-300 Optical axis of illumination optical system O-400 Optical axis of observation optical system O-400L Optical axis of observation optical system for left eye O-400R Light of observation optical system for right eye Axis O-400S Optical path of secondary observation optical system O-500 Optical path of OCT optical system P-300 Optical path of illumination optical system P-400L Optical path of observation optical system for left eye P-400R Optical path of observation optical system for right eye Optical path of P-500 OCT optical system L0 Light output from OCT light source unit LC Interference light LS Measurement light LR Reference light U0 Front focal position

Claims (8)

An illumination optical system that illuminates the eye to be inspected, an observation optical system having an observation optical system for the left eye and an observation optical system for the right eye for observing the eye to be inspected illuminated by the illumination optical system, and the observation optical system. An objective lens through which the optical axis of the observation optical system for the left eye and the optical axis of the observation optical system for the right eye are commonly transmitted, and an OCT optical system for inspecting the eye to be inspected by optical coherence stromography. In an ophthalmic microscope
The optical axis of the OCT optical system does not pass through the objective lens through which the optical axis of the observation optical system is transmitted, and the optical axis of the observation optical system and the optical axis of the OCT optical system are non-coaxial. The observation optical system, the objective lens, and the OCT optical system are arranged .
In addition to the objective lens, an OCT objective lens through which the optical axis of the OCT optical system is transmitted is further provided.
A circular lens or a lens composed of a portion of a circular lens is divided into two, one divided lens is used as the objective lens, and the other divided lens is used as the OCT objective lens. , Ophthalmic microscope. The ophthalmologic microscope according to claim 1, further comprising an objective lens position control mechanism for adjusting the position of the objective lens or the OCT objective lens. The ophthalmologic microscope according to claim 1 or 2 , wherein the OCT optical system is detachably united. The invention according to any one of claims 1 to 3 , further comprising a removable front lens on the optical path between the eye to be inspected and the objective lens for observing the retina of the eye to be inspected. The described ophthalmic microscope. An illumination optical system that illuminates the eye to be inspected, an observation optical system having an observation optical system for the left eye and an observation optical system for the right eye for observing the eye to be inspected illuminated by the illumination optical system, and the observation optical system. To replace the objective lens with a function expansion unit used in an ophthalmic microscope having an optical axis of the observation optical system for the left eye and an objective lens that transmits the optical axis of the observation optical system for the right eye in common. In a function expansion set that includes an interchangeable objective lens
A joint that can be attached to and detached from the ophthalmic microscope
It has an OCT optical system for inspecting the eye to be inspected by optical coherence tomography.
When the function expansion unit is attached to the ophthalmic microscope via the joint portion, the optical axis of the OCT optical system does not transmit the objective lens through which the optical axis of the observation optical system is transmitted, and the observation optical is transmitted. A function expansion set characterized in that the optical axis of the system and the optical axis of the OCT optical system are non-coaxial. The functional expansion set according to claim 5 , further comprising an OCT objective lens through which the optical axis of the OCT optical system is transmitted. The functional expansion set according to claim 5 or 6 , further comprising a removable front lens on the optical path between the eye to be inspected and the objective lens for observing the retina of the eye to be inspected. .. The interchangeable objective lens has a partial shape of a circular lens or a shape in which a notch or a hole is provided in the circular lens.
When the objective lens is replaced with the replacement objective lens and the function expansion unit is attached to the ophthalmologic microscope via the joint portion,
Any one of claims 5 to 7 , wherein the optical axis of the OCT optical system passes through a portion where the replacement objective lens does not exist, or a notch or a hole provided in the replacement objective lens. Extension set described in section .