Topographic steep central islands following excimer laser photorefractive keratectomy

Ronald R. Krueger M.D.; Peter J. McDonnell M.D.

doi:10.1117/12.178559

23 June 1994 Topographic steep central islands following excimer laser photorefractive keratectomy

Ronald R. Krueger M.D., Peter J. McDonnell M.D.

Proceedings Volume 2126, Ophthalmic Technologies IV; (1994) https://doi.org/10.1117/12.178559
Event: OE/LASE '94, 1994, Los Angeles, CA, United States

Abstract

The purpose of this study is to demonstrate that topographic irregularities in the form of central islands of higher refractive power can be seen following excimer laser refractive surgery. We reviewed the computerized corneal topographic maps of 35 patients undergoing excimer laser PRK for compound myopic astigmatism or anisometropia from 8/91 to 8/93 at the USC/Doheny Eye Institute. The topographic maps were generated by the Computed Anatomy Corneal Modeling System, and central islands were defined as topographic areas of steepening of at least 3 diopters and 3 mm in diameter. A grading system was developed based on the presence of central islands during the postoperative period. Visually significant topographic steep central islands may be seen in over 50% of patients at 1 month following excimer laser PRK, and persist at 3 months in up to 24% of patients without nitrogen gas blowing. Loss of best corrected visual acuity or ghosting is associated with island formation, and may prolong visual rehabilitation after excimer laser PRK.

Citation Download Citation

Ronald R. Krueger M.D. and Peter J. McDonnell M.D. "Topographic steep central islands following excimer laser photorefractive keratectomy", Proc. SPIE 2126, Ophthalmic Technologies IV, (23 June 1994); https://doi.org/10.1117/12.178559

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KEYWORDS

Excimer lasers

Visualization

Nitrogen

Laser ablation

Eye

Refraction

Monochromatic aberrations

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