Patent ID: 9271647
Filing Date: 2016-03-01
CPC Classification: A61B

Claim Text:
1. A method for objectively determining a visual axis of an eye, comprising: projecting a set of narrow, separate laser beams into a central zone of a pupil of the eye or into any zone in the pupil wherein crossings of an anterior surface of the cornea by said laser beams encircle an unambiguously determinable axis of the eye; detecting and measuring positions of the projections on a retina of the eye to provide a set of projections; averaging the tilts of all separate laser beams to calculate a wave front tilt of radiation backscattered from the retina as a best fit from the set of projections, and reconstructing the visual axis from a set of traces of chief rays exiting from the eye crossing the nodal point of the optical system of the eye that are normal to the wave front tilts.