Abstract: An aberrometer is provided for automatically measuring a human eye aberration, determining a subjective visual acuity associated with the selection of a best spherocylindrical correction, and investigating the influence of high orders aberrations on the visual acuity. The aberrometer includes a point light source which is projected on the eye retina, scattered back by the retina, and passes through the eye optical systems acquiring a phase modulation corresponding to the total eye optical aberration. The aberrometer also includes a wave front sensor whose output signal is transmitted to a device control system, an aberration compensation system which is disposed between the human eye and the wave front sensor and through which radiation coming out from the eye and projected on the eye retina passes, and a test picture projector which projects the test picture image on the eye retina through the aberration compensation system.