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

1991-07-24

1993-06-15

Shay, David M.

Surgery

Instruments

Light application

606 3, 606 10, 606 13, 128848, A61N 506

Patent

active

052193446

ABSTRACT:
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 insignificance 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.

Affiliated with

Also associated with

Rating

Methods and apparatus for laser sculpture of the cornea does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Methods and apparatus for laser sculpture of the cornea, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Methods and apparatus for laser sculpture of the cornea will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1039465