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J. Barreto, Jr., M. V. Netto, A. Reis, M. Ruiz Alves, S. J. Bechara; Contrast Sensitivity and Wavefront Analysis After Custom LASIK vs. Custom PRK. Invest. Ophthalmol. Vis. Sci. 2008;49(13):5644.
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© ARVO (1962-2015); The Authors (2016-present)
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.
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.
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.
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.
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