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Proceedings Paper

Pre- and postoperative optical resolution of the cornea: a preliminary report
Author(s): Jean-Marie A. Parel; Gabriel Simon; Pascal O. Rol; Qiushi Ren; William E. Lee
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Paper Abstract

The effect of novel refractive surgical techniques on visual acuity and contrast sensitivity is normally determined by the outcome of human clinical trials. For example, ArF laser photorefractive keratoplasty follows an algorithm based on the patient's preoperative data for keratometry, refraction, pachometry, and ocular length all measured with ultrasound. A normalized ablation rate (which is function of the laser fluence), and the desired refractive correction are then used to calculate the ablation depth. On the day of surgery, the epithelium is mechanically removed and the bare cornea photoablated. Finally, the cornea may be medicated with a topical application of antibiotics and the eye is patched. On postoperative day 7, the epithelium is healed and visual acuity and keratometry are measured. With PRK, the theoretical outcome refraction should be within +/- 0.25 D. Thus far however, reproducibility is only of +/- 2 D. We believe the large discrepancy between theory and practice is due to several parameters that vary patient-to-patient.

Paper Details

Date Published: 24 June 1993
PDF: 5 pages
Proc. SPIE 1877, Ophthalmic Technologies III, (24 June 1993); doi: 10.1117/12.147557
Show Author Affiliations
Jean-Marie A. Parel, Bascom Palmer Eye Institute/Univ. of Miami School of Medicine (United States)
Univ. de Paris (France)
Univ. of Miami College of Engineering (United States)
Gabriel Simon, Bascom Palmer Eye Institute/Univ. of Miami School of Medicine (United States)
Pascal O. Rol, ETH Univ. of Zurich (Switzerland)
Univ. of Miami College of Engineering (United States)
Qiushi Ren, Bascom Palmer Eye Institute/Univ. of Miami School of Medicine (United States)
Univ. of Miami College of Engineering (United States)
William E. Lee, Bascom Palmer Eye Institute/Univ. of Miami School of Medicine (United States)


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

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