Ophthalmologic microscope and function expansion unit

1. An ophthalmologic microscope comprising:

an illuminating optical system for illuminating a subject's eye;

an observation optical system that comprises an observation optical system for left eye and an observation optical system for right eye to observe the subject's eye illuminated by the illuminating optical system;

an objective lens through which an optical axis of the observation optical system for left eye and an optical axis of the observation optical system for right eye of the observation optical system commonly penetrate; and

an OCT optical system for scanning a measuring light to test the subject's eye with Optical Coherence Tomography;

wherein the observation optical system, the objective lens, and the OCT optical system are placed in such a way that the optical axis of the OCT optical system does not penetrate through the objective lens through which the optical axis of the observation optical system penetrates, and the optical axis of the observation optical system and the optical axis of the OCT optical system are non-coaxial; and

further comprising an SLO optical system that scans a light ray which is a visible ray, a near infrared ray, or an infrared ray and guides the light to the subject's eye so as to become substantially coaxial with the optical axis of the OCT optical system, and the SLO optical system being configured such that the ophthalmologic microscope observe an area including a section of the subject's eye where the OCT optical system scans, with the SLO optical system.

2. The ophthalmologic microscope according to claim 1 , wherein the OCT optical system comprises:

a first optical member that guides a light from an OCT light source to a first optical axis direction;

a first reflecting member that guides the light guided to the first optical axis direction to a second optical axis direction substantially perpendicular to the first optical axis direction;

a second optical member that relays the light guided to the second optical axis direction;

a second reflecting member that guides the light relayed by the second optical member to a third optical axis direction substantially perpendicular to the second optical axis direction; and

an objective lens for OCT that is placed on the third optical axis direction and irradiates a prescribed section of the subject's eye with the light guided to the third optical axis direction.

3. The ophthalmologic microscope according to claim 1 , further comprising a deflection optical element that commonly scans a measuring light of the OCT optical system and a light ray of the SLO optical system.

4. The ophthalmologic microscope according to claim 1 , wherein the objective lens has either a partial shape of a circular lens or a shape of circular lens with a cutout or hole, and

the optical axis of the OCT optical system penetrates through a portion where the objective lens does not exist, or through a cutout or hole provided in the objective lens.

5. The ophthalmologic microscope according to claim 4 , wherein the objective lens is divided in two, with one part of the divided lens being as the objective lens and the other being as an objective lens for OCT through which the optical axis of the OCT optical system penetrates.

6. The ophthalmologic microscope according to claim 1 , further comprising an objective lens position control mechanism that adjusts a position of the objective lens or the objective lens for OCT.

7. The ophthalmologic microscope according to claim 1 , wherein the OCT optical system and the SLO optical system are detachably unitized.

8. The ophthalmologic microscope according to claim 1 , further comprising a detachable front-end lens on a light path between the subject's eye and the objective lens to observe a retina of the subject's eye.