Patent ID: 8052674
Filing Date: 2011-11-08
Classification: A61B,A61F

Abstract:
1. A vision correction laser system for treating an eye having a cornea, the laser system comprising: a laser beam source capable of generating a laser beam for vision correction treatment; at least two spaced apart stationary light sources constructed to radiate toward the eye to produce a corresponding pattern of spaced apart light source reflected images from the outer surface of the anterior portion of the cornea, radially inward of the limbus, that is the target of the laser treatment, the light sources being spaced from the laser beam; an eye position detector which includes at least a corneal tracker, the eye position detector constructed to measure both rotation and translation of the eye; the corneal tracker including an image sensor having an imaging window that detects the pattern of spaced apart light source reflected images from the cornea radially inward of the limbus, and the corneal tracker constructed, by use of digital image processing of the sensed pattern of light source reflected images, to determine changes in the positions of the light source reflected images to measure rolling movement of the eye from side to side, angle theta (θ), and up to down, angle phi (φ); and a beam controller, the beam controller being responsive to the eye position detector to direct the laser beam with controlled energy from the laser beam source to a desired location on the eye.