A fundus oculi observation device comprises: an image forming part (220) configured to optically acquire data and form a tomographic image of a fundus oculi of an eye a storage (212) configured to store optical information (V) representing a state of an ocular optical system of the eye a calculator (231) configured to calculate a magnification of the ocular optical system, based on the optical information (V) and an analyzer (232) configured to analyze the tomographic image, based on the magnification.
