A process and an apparatus are proposed for determining optical aberrations of an eye (12) with its optical system (30) including the cornea (32, 173) and the lens (34, 180). The process includes the reconstructing of wavefront aberrations (100) of the eye (12) as a deviation of the wavefront (102), determined by the optical system (30) of the eye (12) with a process of aberrometry, with respect to an ideal planar wavefront (104) generated by an aberration-free eye model. A measured ocular length is employed for the aberration-free eye model.
