Patent ID: 7370966

Claim:
An ophthalmologic apparatus comprising: a light source configured to emit a low coherence light; an interference light generator configured to split the emitted low coherence light into the signal light directed toward the fundus oculi of an eye and the reference light directed toward the reference object, and to overlap the signal light irradiated onto the eye via a signal light path and reflected by the fundus oculi and the reference light reflected by said reference object via a reference light path, so as to generate interference light; a detector configured to receive the generated interference light and to output a detection signal; an alignment part configured to align an optical system forming said signal light path to the eye; and an intraocular distance calculator operable to determine the intraocular distance based on the optical path length of said signal light path, the optical path length of said reference light path, said aligned distance between the eye and said optical system, and said output detection signal, the intraocular distance being between the incident position of said signal light onto the eye and the reflection position of said signal light at the fundus oculi.