Patent ID: 8226234

Claim:
A fundus camera comprising: an illumination optical system configured to project a ring-shaped illumination light on a pupil of a subject's eye; an imaging optical system configured to form a fundus image of the illumination light from a fundus on an imaging plane via an objective lens; an index projection unit configured to project an operation distance index on a cornea of the subject's eye via the objective lens; an imaging unit configured to capture a reflection image from the fundus and a reflection image of the operation distance index from the cornea; a driving unit configured to move the index projection unit in an optical axis direction of the imaging optical system; an index shape recognition unit configured to recognize an index shape projected on the cornea according to a movement of a light emitting surface of the index projection unit by the driving unit; and a detection unit configured to detect operation distances of the illumination optical system and the imaging optical system with respect to the subject's eye based on driving information about the driving unit and an output of the index shape recognition unit.