Abstract
Purpose: :
To compare spherical aberration (SA) and contrast sensitivity after custom surgeries for myopia and myopic astigmatism correction.
Methods: :
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.
Results: :
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.
Conclusions: :
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.
Keywords: contrast sensitivity • refractive surgery • refractive surgery: optical quality