Patent ID: 7354152

Claim:
An ophthalmic apparatus for examining an eye to be examined, the apparatus comprising: a photo-receiving optical system, being arranged on an inside of the apparatus and having optical members, for photo-receiving examination light reflected from the eye which is at an examination position on an outside of the apparatus; a projection optical system, being arranged on the inside of the apparatus and having a light source, for projecting detection light toward at least one of the optical members that is arranged nearest to the outside of the apparatus; a photodetector for photo-receiving reflected detection light when the light source is lit in a state where the eye is not placed at the examination position; and abnormality detection means for detecting abnormality of the at least one of the optical members based on an output signal from the photodetector, wherein the light source blinks at a predetermined high frequency, and the abnormality detection means includes a filter circuit which transmits only a signal with a high frequency component form the light source.