PMID: 9186435Jun 1, 1997Paper

Analysis of corneal topography after automated lamellar keratoplasty

Ophthalmology
M C HelenaS E Wilson

Abstract

The purpose of the study is to evaluate the effects of myopic automated lamellar keratoplasty (ALK) on corneal topography. The authors performed a retrospective study of computer-assisted topographic maps obtained before surgery and at the last follow-up visit of 9 patients (13 eyes) who underwent ALK without enhancement to correct moderate-to-high myopia during a 12-month period. Follow-up ranged from 3.5 to 13 months (mean, 5.8; standard deviation, 3.1). The mean manifest spherical equivalent changed from -10.5 +/- 2.2 diopters (D) before surgery to -1.1 +/- 1.8 D at the last follow-up visit. Mean simulated keratometry (Sim K) decreased from 45.6 +/- 1.9 D to 38.9 +/- 2.7 D. Mean corneal astigmatism increased from 1.3 +/- 0.8 D to 2.1 +/- 0.9 D. The mean surgically induced cylinder vector (calculated by vector analysis) was 1.1 +/- 0.6 D. Mean surface regularity index (SRI) and surface asymmetry index (SAI) increased from 0.37 +/- 0.38 and 0.32 +/- 0.43 before surgery to 1.00 +/- 0.32 (P < 0.001) and 0.75 +/- 0.36 (P = 0.01), respectively, at the last visit. A positive correlation was observed between the decrease in mean Sim K and the increase in manifest spherical equivalent (reduction of myopia) (r = 0.77, P = 0.002), incr...Continue Reading

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Citations

Dec 28, 1999·Journal of Cataract and Refractive Surgery·L SpadeaE Balestrazzi

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