Apparatus, method, program, and system

1. A microscope system comprising:

a microscope configured to image a subject's eye with an image sensor;

a holding arm configured to hold the microscope;

a front lens support configured to insert/remove a front lens for observing a posterior of the subject's eye onto an optical axis of the microscope; and

circuitry, when the posterior of the subject's eye is to be imaged, configured to:

move at least one of the microscope and the front lens relative to one another along the optical axis direction of the microscope, thereby adjusting a position in the optical axis direction of the microscope of the front lens such that the front lens is positioned at a designed front lens position at which a distance to the subject's eye is a predetermined distance in a case where the front lens is inserted onto the optical axis of the microscope by the front lens support, and

execute an auto-focus control that focuses the microscope on an image-forming position of an image of the posterior of the subject's eye by the front lens when the front lens is inserted onto the optical axis of the microscope at the designed front lens position by the front lens support.

2. The microscope system according to claim 1 , wherein

circuitry is configured to execute the auto-focus control intended to refocus near a designed posterior eye image position that is an image-forming position of an image of the posterior eye by the front lens in a case in which the front lens is disposed at the designed front lens position.

3. The microscope system according to claim 1 , wherein

the front lens support includes the front lens, a front lens holding member that holds the front lens on a front end, and a rotation axis section interposed between a base end of the front lens holding member and the microscope that rotatably supports the front lens holding member with respect to the microscope section by treating the base end of the front lens holding member as a base point.

4. The microscope system according to claim 3 , wherein

the holding arm includes a microscope translator configured to move the microscope in the optical axis direction of the microscope,

the front lens support is configured such that when the front lens is inserted onto the optical axis of the microscope, a distance in the optical axis direction of the microscope between the microscope and the front lens becomes fixed, and

when the front lens is inserted onto the optical axis of the microscope by the front lens support, the circuitry is configured to move the microscope in the optical axis direction of the microscope by the microscope translator such that the front lens is positioned at the designed front lens position.

5. The microscope system according to claim 3 , wherein

the front lens support is configured such that a length of the front lens holding member is variable, and when the front lens is inserted onto the optical axis of the microscope, a distance in the optical axis direction of the microscope between the microscope and the front lens is changeable, and

when the front lens is inserted onto the optical axis of the microscope by the front lens support, the circuitry is configured to operate the front lens holding member to change the distance in the optical axis direction of the microscope of the front lens with respect to the microscope such that the front lens is positioned at the designed front lens position.

6. The microscope system according to claim 1 , wherein

the front lens support includes the front lens, a front lens holding member that holds the front lens on a front end, and a rotation axis section interposed between a base end of the front lens holding member and the holding arm that rotatably supports the front lens holding member with respect to the holding arm by treating the base end of the front lens holding member as a base point.

7. The microscope system according to claim 6 , wherein

the rotation axis section is configured to be movable on the holding arm, and

the circuitry is configured to move the rotation axis section on the holding arm to move the front lens holding member to adjust the position in the optical axis direction of the microscope of the front lens.

8. The microscope system according to claim 6 , wherein

the front lens support includes a light source configured to emit illuminating light at the subject's eye.

9. The microscope system according to claim 1 , wherein

when the front lens is inserted onto the optical axis of the microscope by the front lens support the circuitry is configured to execute an auto-focus control that an exposure in the microscope to an exposure corresponding to a brightness of an image of the posterior of the subject's eye formed by the front lens.

10. The microscope system according to claim wherein

when the front lens is inserted onto the optical axis of the microscope by the front lens support, the circuitry is configured to convert an inverse image to a correct image in which an image of the posterior of the subject's eye captured by the front lens is inverted up and down as well as left and right.

11. The microscope system according to claim 1 , wherein the circuitry is configured to move at least one of the microscope and the front lens relative to one another before the front lens is inserted onto the optical axis of the microscope by the front lens support.

12. The microscope system according to claim 1 , wherein the circuitry is configured to move at least one of the microscope and the front lens relative to one another after the front lens is inserted onto the optical axis of the microscope by the front lens support.

13. A control method, executed by a processor, comprising:

performing magnified observation of a subject's eye using a microscope to image the subject's eye with an image sensor for performing magnified observation of an anterior of the subject's eye;

performing magnified observation of a posterior of the subject's eye with the image sensor for performing magnified observation, performing magnified observation of the posterior of the subject's eye including

inserting a front lens onto an optical axis of the microscope,

moving at least one of the microscope and the front lens relative to one another along the optical axis direction of the microscope, thereby adjusting a position in the optical axis direction of the microscope of the front lens such that the front lens is positioned at a designed front lens position at which a distance to the subject's eye is at a predetermined distance in a case where the front lens is inserted onto the optical axis of the microscope, and

executing auto-focus control that focuses the microscope on an image-forming position of an image of the posterior by the front lens when the front lens is inserted onto the optical axis of the microscope at the designed front lens position.

14. The control method according to claim 13 , wherein moving at least one of the microscope and the front lens relative to one another is before inserting the front lens onto the optical axis of the microscope.

15. The control method according to claim 13 , wherein moving at least one of the microscope and the front lens relative to one another is after inserting the front lens onto the optical axis of the microscope.

16. A controller for use with microscope apparatus including a microscope for imaging an anterior and a posterior of a subject's eye, the controller comprising:

circuitry, when the posterior of the subject's eye is to be imaged, configured to:

insert a front lens onto an optical axis of the microscope,

move the microscope and the front lens relative to one another along the optical axis direction of the microscope, thereby adjusting a position in the optical axis direction of the microscope of the front lens such that the front lens is positioned at a designed front lens position at which a distance to the subject's eye is at a predetermined distance in a case where the front lens is inserted onto the optical axis of the microscope, and

execute auto-focus control that focuses the microscope on an image-forming position of an image of the posterior of the subject's eye by the front lens in a case where the front lens is inserted onto the optical axis of the microscope at the designed front lens position.

17. The controller according to claim 16 , wherein the circuitry is configured to move at least one of the microscope and the front lens relative to one another before the front lens is inserted onto the optical axis of the microscope by a front lens support on which the front lens is mounted.

18. The controller according to claim 16 , wherein the circuitry is configured to move at least one of the microscope and the front lens relative to one another after the front lens is inserted onto the optical axis of the microscope by a front lens support on which the front lens is mounted.