Rotatable aperture apparatus and methods for selective photoabla

Details Rotatable aperture apparatus and methods for selective photoabla Rotatable aperture apparatus and methods for selective photoabla

1994-12-28

1997-07-29

Cohen, Lee S.

Surgery

Instruments

Light application

606 10, 606 17, 606 4, 128898, A61N 506

Patent

active

056517840

ABSTRACT:
Apparatus and methods to modify the intensity distribution of a beam of radiation, such as a laser, and for eroding surfaces with predetermined shapes. A rotatable mask is formed with one or more apertures that have a geometric spiral shape originating substantially the center of rotation on the mask. The mask is insert to the beam for modification of the intensity of that beam, and additionally to form the desired etch pattern on a target surface. In a preferred embodiment, the invention is useful for performing kerotoplasty or keratomileusis.

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