1. An imaging apparatus comprising; a first imaging unit configured to perform imaging of a plurality of planar images of a target eye; a first determination unit configured to determine time intervals of specific movements of the target eye by analyzing the plurality of planar images; a second imaging unit configured to perform optical coherence tomography by scanning the target eye to form a tomogram of the target eye; and a second determination unit configured to determine a parameter, to be used by the second imaging unit, to form the tomogram of the target eye based on the time intervals.