Laser reprofiling system employing an erodable mask

Details Laser reprofiling system employing an erodable mask Laser reprofiling system employing an erodable mask

1989-08-11

1991-05-28

Pellegrino, Stephen C.

Surgery

Instruments

Light application

606 13, 128395, 128898, 350363, 2191216, 21912167, 21912169, 21912173, 21912185, A61N 506

Patent

active

050190741

ABSTRACT:
A laser system for reprofiling a surface comprising a laser and an erodable mask disposed between the laser means and the surface for providing a predefined profile of resistance to erosion by laser radiation, and control for controlling the laser such that upon irradiation of the mask, a portion of the laser radiation is selectively absorbed and another portion is transmitted to the surface in accordance with the mask profile to selectively erode the surface. The mask can be connected to the support structure and disposed in optical alignment with the laser means and the cornea. The mask can be directed integrated with the support structure or, preferably, a transparent stage can be formed as part of the support structure to support and position the masking lens. In one preferred embodiment, the mask is spatially separated from the surface and imaged onto the surface, thereby permitting the use of an oversized mask, which is easier to form.

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