Application of the holmium:YAG laser for refractive surgery: an update of clinical progress

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

doi:10.1117/12.147513

24 June 1993 Application of the holmium:YAG laser for refractive surgery: an update of clinical progress

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

Author Affiliations +

Proceedings Volume 1877, Ophthalmic Technologies III; (1993) https://doi.org/10.1117/12.147513
Event: OE/LASE'93: Optics, Electro-Optics, and Laser Applications in Scienceand Engineering, 1993, Los Angeles, CA, United States

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.

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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, and David F. Muller "Application of the holmium:YAG laser for refractive surgery: an update of clinical progress", Proc. SPIE 1877, Ophthalmic Technologies III, (24 June 1993); https://doi.org/10.1117/12.147513

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