Patent ID: 7377642

Claim:
A fundus camera, comprising: an illumination optical system for projecting an illumination light to a fundus of a subject's eye; a photographing device for photographing the fundus; and a light-receiving optical system for guiding the reflected illumination light from the fundus to the photographing device, which includes a focus lens disposed in a light-receiving optical path for focusing the photographing device with respect to the fundus and a diopter compensation lens configured as being inserted into or withdrawn from the light-receiving optical path; a controlling device for determining whether a feasible focusing range of the focus lens is surpassed or not; and a driving device for inserting the diopter compensation lens into or withdrawing the diopter compensation lens from the light-receiving optical path, wherein the controlling device controls the driving device to insert into the light-receiving optical path the diopter compensation lens with a suitable diopter scale making the focus lens focus feasibly if the feasible focusing range of the focus lens is surpassed.