Photorefractive keratectomy

Details Photorefractive keratectomy Photorefractive keratectomy

1987-08-05

1992-11-17

Shay, David M.

Surgery

Instruments

Light application

606 3, 606 10, 606 13, 128395, A61N 502, A61N 506

Patent

active

051639343

ABSTRACT:
Photorefractive keratectomy is accomplished by an excimer laser beam that ablates away corneal tissue in a photo decomposition process. Before this occurs, the epithelium (21) of the cornea (20) is surgically removed to expose Bowman's layer (22) on the anterior surface of the stroma (23) and to begin the laser ablation at Bowman's layer. An excimer laser beam is preferred for this and is rotated during the ablation to average out energy density variations in the beam. The beam is also variably masked concentrically of its axis, during the ablation, to remove corneal tissue to varying depths as necessary for recontouring the anterior stroma. Afterward, epithelium (21) rapidly regrows and resurfaces the contoured area.

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Stephen L. Trokel, R. Srinivasan, and Bodil Braren, "Excimer Laser Surgery of the Cornea", American Journal of Ophthalmology, vol. 96, No. 6, Dec. 1983, pp. 710-715.
Marguerite B. McDonald and Herbert E. Kaufman, Chapter 21, pp. 431-432, "Epikeratophakia for Aphakia, Myopia, and Keratoconus in the Adult Patient", Refractive Corneal Surgery, published by Slack Incorporated, 6900 Grove Road, Thorofare, N.J. 08086.

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