Method and apparatus for intrastromal refractive surgery

Details Method and apparatus for intrastromal refractive surgery Method and apparatus for intrastromal refractive surgery

2006-09-05

2006-09-05

Shay, David M. (Department: 3735)

Surgery

Instruments

Light application

C606S010000

Reexamination Certificate

active

07101364

ABSTRACT:
A method and apparatus for intrastromal refractive surgery is disclosed wherein tissue at selected locations within the stroma of the cornea is photoablated using a pulsed laser beam. The apparatus includes an optical system for forming a shaped laser beam having a waist at a predetermined distance from the optical system. The pulse duration and pulse energy of the laser beam are selected to cause ablation to occur in front of the waist (i.e. between the waist and the optical system). To achieve this, a pulse energy is used that exceeds the minimum pulse energy required for ablation at the waist. By ablating in front of the waist, a relatively large ablation zone (per pulse) is created (compared to ablation at the waist). Furthermore, while the laser is scanned through the cornea to effectuate a refractive change, the optical system maintains a uniform waist for the laser beam.

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