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Proceedings Paper

Application of the holmium:YAG laser for refractive surgery: an update of clinical progress
Author(s): Vance M. Thompson M.D.; Daniel S. Durrie M.D.; John D. Hunkeler M.D.; Art C. Hurt III; P. Michael Mann M.D.; Theo Seiler; Michael C. King; Alex C. Sacharoff; David F. Muller
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Paper Abstract

We describe the results of a 30 patient Phase I clinical trial using the Laser Thermokeratoplasty (LTK) treatment for correction of hyperopic astigmatism. We report the results for 29 patients who have reached 2 months post-operative. The average pre-op cylinder was reduced from -3.06 Diopters (D) to -1.21 D. Average spherical equivalent (SE) refractive error was reduced from +2.28 to +1.34 D. Six patients have reached 4 months post-op; the average cylinder of these patients has been reduced from -1.92 to -0.79 D while the average SE has been reduced from +1.29 to +0.31 D. Although patients had varying degrees of astigmatism pre-op, all treatments were performed with identical parameters (intended to correct a small amount of astigmatism) to enable us to determine the effect of the procedure without the influence of other factors such as varying zone diameter or laser fluence. The predictability and stability of the LTK procedure are supported by a recent study of 20 patients treated in Germany by Seiler for low to moderate degrees (2 - 4 D) of hyperopia. After 6 months post-op, 16 of 20 patients are within +/- 1 D of the attempted correction. Longer-term follow-up will be necessary to determine the ultimate refractive stability of the LTK procedure.

Paper Details

Date Published: 24 June 1993
PDF: 5 pages
Proc. SPIE 1877, Ophthalmic Technologies III, (24 June 1993); doi: 10.1117/12.147513
Show Author Affiliations
Vance M. Thompson M.D., Ophthalmology Ltd. (United States)
Daniel S. Durrie M.D., Hunkeler Eye Clinic (United States)
John D. Hunkeler M.D., Hunkeler Eye Clinic (United States)
Art C. Hurt III, Consultant (United States)
P. Michael Mann M.D., Mann Eye Clinic (United States)
Theo Seiler, Freie Univ. Augenklinik (Germany)
Michael C. King, Summit Technology, Inc. (United States)
Alex C. Sacharoff, Summit Technology, Inc. (United States)
David F. Muller, Summit Technology, Inc. (United States)

Published in SPIE Proceedings Vol. 1877:
Ophthalmic Technologies III
Jean-Marie A. Parel; Qiushi Ren, Editor(s)

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