Provided is an ophthalmologic apparatus including: an acquisition unit configured to acquire tomographic information of an eye to be examined using information on interference light between return light from the eye to be examined, which is irradiated with measurement light, and reference light; and a vitreous structure detection unit configured to detect a vitreous structure of the eye to be examined using tomographic information of the eye to be examined that is acquired after at least one of the difference in optical path length between the measurement light and the reference light and the in-focus position is controlled, wherein the acquisition unit is configured to acquire tomographic information of the vitreous structure.