OPHTHALMOLOGIC APPARATUS, CONTROL METHOD FOR OPHTHALMOLOGIC APPARATUS, PROGRAM, AND STORAGE MEDIUM OF PROGRAM

• US 20110292339A1
• Filed: 05/26/2011
• Published: 12/01/2011
• Est. Priority Date: 05/28/2010
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Itoh, Hiroshi
• Granted Patent: US 9,215,976 B2
• Time in Patent Office: Days
• US Class Current: 351/206
• CPC Class Codes: A61B 3/14 Arrangements specially adapted for eye photography apparatus or arrangements for taking photographs per se G03B

Abstract

A control unit, if insertion of a diopter correction lens or retraction of the diopter correction lens is detected, moves a focusing lens to a position according to an insertion or retraction state of the diopter correction lens corresponding to a position of the focusing lens detected by a focusing lens position detection unit.

Claims

1. An ophthalmologic apparatus comprising:

an imaging optical system configured to image reflected light from a fundus by an imaging unit via a focusing lens;

a correction unit configured to correct a diopter by inserting a diopter correction lens into the imaging optical system; and

a control unit configured, if the diopter correction lens is inserted by the correction unit, to move a position of the focusing lens in a direction in which change in the diopter generated by insertion of the diopter correction lens is reduced.

2. The ophthalmologic apparatus according to claim 1, further comprising:

a first detection unit configured to detect a position of the focusing lens which causes the reflected light from the fundus to form an image on the imaging unit,

wherein if the diopter correction lens is inserted by the correction unit, the control unit moves the position of the focusing lens based on position information about the focusing lens detected by the first detection unit.

3. The ophthalmologic apparatus according to claim 1, further comprising:

a second detection unit configured to detect an insertion of a positive or negative diopter correction lens into the optical path for causing the reflected light from the fundus to form an image on the imaging unit and a retraction of the diopter correction lens from the optical path,

wherein if insertion of the diopter correction lens or retraction of the diopter correction lens is detected by the second detection unit, the control unit moves the focusing lens to a position according to an insertion or retraction state of the diopter correction lens.

4. The ophthalmologic apparatus according to claim 1, wherein if a position to which the focusing lens to be moved is not included in a movable range of the focusing lens, the control unit moves the focusing lens to a position closest to the position to which the focusing lens to be moved in the movable range.

5. The ophthalmologic apparatus according to claim 1, wherein if it is detected that the focusing lens has moved to a predetermined position, the control unit controls insertion of the diopter correction lens into the optical path for causing the reflected light from the fundus to form an image on the imaging unit, or retraction of the diopter correction lens from the optical path.

6. The ophthalmologic apparatus according to claim 1, further comprising:

a third detection unit configured to detect a deviation amount of focus,

wherein the control unit controls insertion of the diopter correction lens into the optical path or retraction of the diopter correction lens from the optical path according to a diopter of an examinee'"'"'s eye determined based on a detection result of the third detection unit.

7. A method for controlling an ophthalmologic apparatus executed by the ophthalmologic apparatus, the method comprising:

detecting a position of a focusing lens which causes reflected light from a fundus to form an image on an imaging unit;

detecting insertion of a positive or negative diopter correction lens into an optical path for causing the reflected light from the fundus to form an image on the imaging unit and retraction of the diopter correction lens from the optical path;

if insertion of the diopter correction lens or retraction of the diopter correction lens is detected, moving the focusing lens to a position according to an insertion or retraction state of the diopter correction lens corresponding to the detected position of the focusing lens.

9. A non-transitory storage medium that stores a program for causing a computer to execute a method according to claim 7.

8. A method for controlling an ophthalmologic apparatus, the method comprising:

performing first detection of a position of a focusing lens which causes reflected light from a fundus to form an image on an imaging unit;

performing second detection of whether a diopter correction lens exists in an optical path for causing the reflected light from the fundus to form an image on the imaging unit;

performing third detection of a deviation amount of focus;

determining a diopter of an examinee'"'"'s eye based on results of the first detection, the second detection, and the third detection;

controlling insertion of the diopter correction lens into the optical path or retraction of the diopter correction lens from the optical path according to the determined diopter of the examinee'"'"'s eye; and

if insertion or retraction of the diopter correction lens is controlled, moving the focusing lens to a position according to an insertion or retraction state of the diopter correction lens corresponding to the detected position of the focusing lens.

10. A non-transitory storage medium that stores a program for causing a computer to execute a method according to claim 8.