Patent ID: 8152302

Claim:
A method for determining the clarity of vision of a patient and deriving a prescription for a corrective lens, comprising the steps of: a) forming a retinal image in an eye of the patient by illuminating the eye of the patient with scanning infrared light of a wavelength that generates fluorescent light from proteins in the pigment epithelial cells of the retina by a nonlinear optical process, the scanning infrared light comprising a plurality of beams focused on the retina to form the retinal image from the emitted fluorescent light; b) detecting the clarity of the retinal image; c) adjusting the path length of at least some of the beams of the scanning light to adjust the clarity of the retinal image, wherein such path length adjustments simulate the effect of an optical correction in order to analyze the effectiveness of the corrective lens in focusing light on the retina; and d) deriving the prescription for the corrective lens based upon the path length adjustments.