May 2008
Volume 49, Issue 13
Free
ARVO Annual Meeting Abstract  |   May 2008
Contrast Sensitivity and Wavefront Analysis After Custom LASIK vs. Custom PRK
Author Affiliations & Notes
  • J. Barreto, Jr.
    University of Sao Paulo, Sao Paulo, Brazil
  • M. V. Netto
    University of Sao Paulo, Sao Paulo, Brazil
  • A. Reis
    University of Sao Paulo, Sao Paulo, Brazil
  • M. Ruiz Alves
    University of Sao Paulo, Sao Paulo, Brazil
  • S. J. Bechara
    University of Sao Paulo, Sao Paulo, Brazil
  • Footnotes
    Commercial Relationships  J. Barreto, None; M.V. Netto, None; A. Reis, None; M. Ruiz Alves, None; S.J. Bechara, None.
  • Footnotes
    Support  None.
Investigative Ophthalmology & Visual Science May 2008, Vol.49, 5644. doi:https://doi.org/
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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. doi: https://doi.org/.

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      © ARVO (1962-2015); The Authors (2016-present)

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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 
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