Method and system for laser treatment of refractive error using

Details Method and system for laser treatment of refractive error using Method and system for laser treatment of refractive error using

1994-10-25

1996-09-17

Pellegrino, Stephen C.

Surgery

Instruments

Light application

606 5, A61F 900, A61N 506, A61B 310

Patent

active

055563953

ABSTRACT:
An ophthalmological surgery system and method for performing ablative photodecomposition of the corneal surface by offset image scanning. A mask having opaque and transparent portions corresponding to a desired type of correction, such as a hyperopic correction, intercepts a laser beam to provide a profiled beam. The mask is mounted for rotation about an axis and the image of the mask is offset from an intended center of rotation corresponding to an ablation center by an imaging lens which is radially offset from the center of rotation. The mask and lens rotate in unison to scan the image over the desired portion of the corneal surface. The invention enables wide area treatment with a laser having a narrower beam and makes optional the use of rotating mirrors and prisms.

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