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Proceedings Paper

Holmium:YAG thermokeratoplasty: treatment parameters for the correction of astigmatism based upon enucleated human eyes using an application mask
Author(s): Martin Kriegerowski; Katja Rassmann; Theo Oltrup; Thomas Bende; Benedikt J. Jean M.D.
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Paper Abstract

The refractive outcome of thermokeratoplasty depends upon the location and angle of the coagulation spots, applied with a focusing handpiece onto the corneal surface. Accuracy can be enhanced using a specially designed application mask. An astigmatism correction was performed on 10 human donor eyes (Holmium 25, Technomed, FRG, 15 Hz, 20 mJ/pulse, 25 pulses) with an optical zone of 8.1 mm, 5 eyes received a free hand laser application (marked positions) and the other 5 eyes were treated using a suctioned metal mask with drills for the handpiece (optical zone 8.1 mm). To compare the results a silicone replica was taken and analyzed by a confocal laser microtopometer. The refractive change for the steepest meridian was 10 D with a standard deviation of +/- 3.7 D for the free hand application. Using the application mask the refractive outcome was 9.8 D with a standard deviation of only 0.8 D. Using the application mask the standard deviation for the induced refractive change decreases by a factor of five.

Paper Details

Date Published: 22 May 1995
PDF: 7 pages
Proc. SPIE 2393, Ophthalmic Technologies V, (22 May 1995); doi: 10.1117/12.209827
Show Author Affiliations
Martin Kriegerowski, Univ. Tuebingen (Germany)
Katja Rassmann, Univ. Tuebingen (Germany)
Theo Oltrup, Univ. Tuebingen (Germany)
Thomas Bende, Univ. Tuebingen (Germany)
Benedikt J. Jean M.D., Univ. Tuebingen (Germany)

Published in SPIE Proceedings Vol. 2393:
Ophthalmic Technologies V
Jean-Marie Parel; Qiushi Ren; Karen Margaret Joos M.D., Editor(s)

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