Patent ID: 6932475
Filing Date: 2005-08-23
Classification: A61B

Abstract:
1. A device for measuring aberration refraction of an eye, comprising: a light source producing a probing beam along a path to the eye; a telescopic system of lenses having an entrance pupil and an exit pupil; a two-coordinate deflector consisting of two single-coordinate deflectors separated by a zone; a deflection control unit; an aperture stop; a field stop; a collimating lens; a position-sensitive photodetector with an objective lens operatively positioned for receiving light reflected from the retina of the eye; and a data processing and display unit including a computer and wherein the telescopic system is positioned in the probing beam path after the two-coordinate deflector at a distance corresponding to the coincidence of the entrance pupil focal point of the telescopic system and the zone between the single-coordinate deflectors, the aperture stop is placed between the telescopic system lenses at the point of coincidence of their foci, and the field stop is positioned in the plane of the exit pupil of the telescopic system and at the point of location of the front focus of the collimating lens.