Patent ID: 6063072
Filing Date: 2000-05-16
Classification: A61F,B23K,G02B

Abstract:
A photorefractive keratectomy system for correction of hyperopia of a cornea of an eye of a patient comprising:a radiation source for emitting a beam of ablative radiation;an adjustable beam-shaper for receiving the beam and for selectively transmitting at least a portion of the beam along a path to form an exposure pattern on the cornea that varies over time;a beam-swapping assembly disposed in the beam path between the beam-shaper and the eye of the patient for modifying the beam that has passed through the beam-shaper into a convoluted annular beam of radiation, and for applying the convoluted annular beam to the cornea to remove a selected volume of corneal tissue from a region in an optical zone of the cornea with the ablative radiation, thereby forming a reprofiled region which steepens at least in part, a curvature of the cornea.