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Proceedings Paper

Excimer laser delivery system for astigmatic and hyperopic photorefractive surgery
Author(s): Rasmus Beck; Werner Foerster
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Paper Abstract

Ablation of corneal tissue with excimer laser light is an effective way to correct refractive errors of the eye. For this purpose a beam-stop (iris diaphragm or interchangeable masks) is illuminated by the laser radiation. The beam-stop is imaged onto the cornea, and circular or elliptic ablations are produced. The computer-controlled process varies the diameter of the ablation area in a way that the inner portions of the treatment zone receive more laser energy than the outer portions, thus flattening the curvature of the refractive surface. For the treatment of hyperopia, the outer portions of the ablation area receive more laser energy to steepen the surface profile of the cornea. The beam delivery system employs several sets of circular, elliptic and ring shaped masks which are etched into a stainless-steel tape.

Paper Details

Date Published: 23 June 1994
PDF: 5 pages
Proc. SPIE 2126, Ophthalmic Technologies IV, (23 June 1994); doi: 10.1117/12.178557
Show Author Affiliations
Rasmus Beck, Herbert Schwind GmbH & Co. KG (Germany)
Werner Foerster, Klinik und Poliklinik fuer Augenheilkunde/Univ. Muenster (Germany)

Published in SPIE Proceedings Vol. 2126:
Ophthalmic Technologies IV
Jean-Marie A. Parel; Qiushi Ren, Editor(s)

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