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MM Braun, W Haw; Prospective, Long-term Regression Analysis of Variables Influencing the Safety of LASIK for Hyperopia . Invest. Ophthalmol. Vis. Sci. 2002;43(13):4150.
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© ARVO (1962-2015); The Authors (2016-present)
Purpose: To prospectively identify variables adversely affecting the safety profile of LASIK for hyperopia. Methods: 128 eyes underwent hyperopic LASIK for +2.67 +/- 1.46 D (+1.50 to +7.0 D) using the VISX S2 Smoothscan excimer laser. Linear regression was performed to determine dependent variables influencing loss of best spectacle corrected visual acuity (BSCVA) at each postoperative interval. Variables included age, preoperative spherical equivalent, cylinder, mean keratometry, and prior history of keratorefractive surgery. Results: Hyperopia was corrected 94.2% to a mean of +0.15 +/- 0.65 D. 92.6% of eyes demonstrated an uncorrected visual acuity of 20/40 or better. Loss of best spectacle corrected acuity ≥ two lines occurred in 2.9% of eyes. High mean preoperative keratometry (P=0.03, r2=0.14) and mean preoperative spherical equivalent (P=0.03, r2=0.08) were statistically correlated with loss of BSCVA at 12 months. All other variables were statistically insignificant (P≷0.05). Conclusion: Factors such as preoperative keratometry and preoperative spherical equivalent are important predictors of the safety profile of LASIK for hyperopia.
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