Excimer laser delivery system for astigmatic and hyperopic photorefractive surgery

Rasmus Beck; Werner Foerster M.D.

doi:10.1117/12.178557

23 June 1994 Excimer laser delivery system for astigmatic and hyperopic photorefractive surgery

Rasmus Beck, Werner Foerster M.D.

Proceedings Volume 2126, Ophthalmic Technologies IV; (1994) https://doi.org/10.1117/12.178557
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

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.

Citation Download Citation

Rasmus Beck and Werner Foerster M.D. "Excimer laser delivery system for astigmatic and hyperopic photorefractive surgery", Proc. SPIE 2126, Ophthalmic Technologies IV, (23 June 1994); https://doi.org/10.1117/12.178557

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