An ophthalmologic apparatus includes a projection unit configured to project a light flux to a subjects eye, an imaging optical system configured to form an image of the light flux reflected by the subjects eye or an image of the subjects eye on an imaging plane, an imaging unit provided on the imaging plane of the imaging optical system, a determination unit configured to determine a parameter regarding the imaging unit or the projection unit for acquiring unique information of the subjects eye based on a physical property of the subjects eye, and an acquisition unit configured to acquire the unique information based on the image of the light flux or the image of the subjects eye captured by the imaging unit with use of the determined parameter.
