1. An ophthalmologic apparatus, comprising: an optical unit configured to capture an image of an eye to be examined; a target projection unit configured to project a target on the eye to be examined, the target being used to adjust a working distance between the eye to be examined and the optical unit; and a determination unit configured to determine whether the working distance is appropriate based on a cornea reflection image from the eye to be examined, the cornea reflection image being captured by the optical unit, wherein the determination unit determines a moving direction of the optical unit in which the working distance is appropriate based on a direction of a blur due to an influence of astigmatism contained in the cornea reflection image captured by the optical unit.