Abstract
Purpose: :
To compare contrast sensitivity and wavefront analysis after wavefront-guided LASIK (WFG-LASIK) in one eye and wavefront-guided PRK (WFG-PRK) in the fellow eye for myopia and myopic astigmatism correction.
Methods: :
A prospective study of 70 eyes (35 patients) submitted to simultaneous WFG-LASIK and WFG-PRK (contra-lateral eye). High and low contrast visual acuity, wavefront analysis (high-order aberrations, Strehl ratio, modulation transfer function) and contrast sensitivity were performed preoperatively and at one, three and six months postoperatively. Spatial contrast sensitivity was performed for 20 eyes.
Results: :
In the WFG-LASIK group, 60% eyes had UCVA > or = 20/16 and 94.3% > or = 20/20, and in the WFG-PRK group, 54% and 94.3%, respectively. The mean pre-treatment total high-order aberrations (total HOA) was 0.334+/-0.07µm in the WFG-LASIK group and 0.359+/-0.11µm in the WFG-PRK group (P= .594). At six months, the mean total HOA was +0.455+/-0.13D and -0.441+/-0.15D, respectively (P= .688). Contrast sensitivity has improved similarly for both groups.
Conclusions: :
RMS values of total HOA and other terms showed no statistically significant difference between custom LASIK and custom PRK. Contrast sensitivity has improved after wavefront-guided ablations without significant difference between LASIK and PRK. Both techniques were effective in correcting low myopia and myopic astigmatism with good high and low contrast visual acuity.
Keywords: refractive surgery: optical quality • contrast sensitivity • refractive surgery: comparative studies