Methods and apparatus for laser sculpture of the cornea

Details Methods and apparatus for laser sculpture of the cornea Methods and apparatus for laser sculpture of the cornea

A - Human Necessities

61

F

327/1.2

A61F 9/00 (2006.01) A61F 9/01 (2006.01) B23K 26/06 (2006.01) A61F 9/008 (2006.01)

Patent

CA 1325832

METHODS AND APPARATUS FOR LASER SCULPTURE OF THE CORNEA ABSTRACT OF THE DISCLOSURE In use of laser radiation to ablate corneal tissue, to achieve a sculptured change in curvature of the optically used region of the cornea, a variable magnification (zoom) lens is combined with different sized apertures of an indexible mask to develop a relatively smooth profile for the changed curvature. The zoom-lens settings are varied in the course of cornea exposure through each of the succession of mask apertures. To do this, the range of zoom-lens magnification can always be less than 2:1, yet the zoom-lens system can effectively reduce to insigni- ficance the stepped profiling that is inherent in reliance only upon the indexed aperture technique. Also described are techniques to achieve compensation for delivered flux-density variation as a function of instantaneous zoom-lens setting, and programmable control of the area of delivered flux density in a manner to correct for parabolic or other fall-off in delivered beam intensity as a function of radius outward of the axis of beam delivery.

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