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J. Barreto, Jr., R. Garcia, M. V. Netto, S. J. Bechara, M. R. Alves; Spherical Aberration and Contrast Sensitivity After Custom Surgeries. Invest. Ophthalmol. Vis. Sci. 2010;51(13):3969.
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© ARVO (1962-2015); The Authors (2016-present)
To compare spherical aberration (SA) and contrast sensitivity after custom surgeries for myopia and myopic astigmatism correction.
Chart review of 70 eyes (35 patients) submitted to wavefront-guided LASIK (WFG-LASIK) and wavefront-guided PRK (WFG-PRK) with myopia up to 5D and astigmatism up to 1,5D. Wavefront analysis and contrast sensitivity were performed preoperatively and at one, three, six and twelve months postoperatively.
The mean pre-treatment SA was 0,13±0.07µm in the WFG-LASIK group and 0,12±0.08µm in the WFG-PRK group (p = 0,344). In the WFG-LASIK group, the mean SA was 0,19±0,10µm (induction of 1,46) after 12 months postoperatively, and in the WFG-PRK group, 0,17±0,11 µm (induction of 1,41) (p = 0,089). Photopic contrast sensitivity improved significantly for most frequencies for both techniques. No significant improvement was found for most mesopic contrast sensitivity frequencies for both groups.
Despite SA induction, photopic contrast sensitivity has improved after WFG-LASIK and WFG-PRK without significant difference between them. Changes in low levels of SA RMS wavefront error poorly predict visual performance.
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