Examination apparatus, control method thereof, and ophthalmic apparatus

Abstract

An ophthalmic apparatus is provided with an image capturing optical system and an image capturing apparatus, and optically examines an eye to be examined by performing focus detection using image capturing surface phase difference AF. A focus detection unit calculates data for a focus detection precision map from a defocus amount based on the phase difference detection. In a case in which the focus detection precision of a first subject is less than an established precision, a region determining unit determines a circle or concentric circle region that passes through the first subject, and determines a region that includes a second subject on the focus detection precision map included on the circle or inside of the concentric circle region, and that also has a focus detection precision that is higher than a predetermined precision. The focus detection unit then performs focus detection on the second subject.