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Variables Affecting Refractive Outcome Following Lasik For Myopia
Variables affecting refractive outcome following LASIK for myopia.
Author: Feltham MH , Wong R , Wolfe R , Stapleton F
Source: Eye, (): 0 2007
Summary of Research:
AimTo investigate factors affecting refractive outcome following LASIK for myopia.MethodSix hundred and seventy-four consecutive uncomplicated myopic LASIK surgeries, performed by a single surgeon, either using the Technolas 217 planoscan (n=372) or the NIDEK EC 5000 (n=302), were evaluated. Stratified random sampling was used to match the groups for refractive error, patient age, and gender. The final analysis included 302 patients from each treatment group. Conditions were identical for both surgeries, and pre-operative refractive errors were between -1.00 and -14.00 DS and <-1.50 DC. Refractive
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success was defined as -0.50 to +0.50 DS of the targeted refraction measured 3 months after surgery. A stepwise logistical regression analysis was used to determine variables associated with refractive failure.ResultsA successful refractive outcome was achieved in 78% (235/302) of surgeries using the Technolas laser and in 88% (266/302) using the NIDEK laser. Predictor variables for not achieving refractive success were pre-operative refractive error of above -5.00 DS, age more than 40 years, and surgery performed with the Technolas laser.ConclusionBoth the Technolas 217 and the NIDEK EC-5000 excimer lasers achieve a successful refractive outcome in the majority of cases. However, patient and surgical factors can influence refractive outcome.Eye advance online publication, 18 May 2007; doi:10.1038/sj.eye.6702856.
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