Patent ID: 6715877
Filing Date: 2004-04-06
Classification: A61B

Abstract:
A method of measurement of wave aberrations of an eye, the method comprising the steps of probing an eye with a narrow beam of laser radiation; selecting a component of the radiation scattered by a retina and exited back from the eye; partitioning said component into subapertures by a lenslet array, measuring a wave front tilt in each subaperture by determining a shift of a position of a focal spot in regards to an optical axis of each lens of the lenslet array; reconstructing the wave front using the measured tilts in separate subapertures; calculating aberrations of the wave front as measures of wave front deviation from an ideal shape; measuring the wave front tilts in the subapertures several times with a tilt of the whole beam of laser radiation varied in each subsequent measurement by a value within an angular range between neighboring subapertures; and performing the reconstruction of the wave front from data obtained at all tilts of the whole beam of laser radiation.