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Aberrations and visual performance following standard laser vision correction.

S Marcos1

  • 1Instituto de Optica Daza de Valdes, Consejo Superior de Investigaciones Científicas, Madrid, Spain. susana@io.cfmac.csic.es

Journal of Refractive Surgery (Thorofare, N.J. : 1995)
|October 5, 2001
PubMed
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Standard laser in situ keratomileusis (LASIK) surgery for myopia increases ocular aberrations, impacting contrast sensitivity. Total aberration measurements, not just corneal ones, better predict visual performance changes after LASIK.

Area of Science:

  • Ophthalmology
  • Optometry
  • Vision Science

Background:

  • Standard laser in situ keratomileusis (LASIK) is a common refractive surgery for myopia.
  • Understanding the optical changes induced by LASIK is crucial for patient outcomes.
  • Ocular aberrations can affect visual performance after refractive surgery.

Purpose of the Study:

  • To correlate changes in ocular aberrations with visual performance alterations following standard LASIK for myopia.
  • To assess the predictive value of different aberration measurements for visual outcomes.

Main Methods:

  • Aberrations and visual performance were measured pre- and post-LASIK in 22 eyes.
  • Total aberrations were assessed using laser ray tracing.
  • Corneal aberrations were measured with a videokeratoscope and custom software.

Related Experiment Videos

  • Visual performance was evaluated via contrast sensitivity and high-contrast visual acuity.

    • Main Results:

    • LASIK increased total and corneal aberrations in most eyes.
    • Total and corneal aberration patterns generally correlated post-surgery.
    • Total aberrations were better predictors of visual performance than anterior corneal data alone.
    • Decreased modulation transfer function correlated with reduced contrast sensitivity.
    • High-resolution visual acuity showed limited sensitivity to LASIK-induced optical changes.

    Conclusions:

    • Wavefront and total aberration measurements offer insights into optical changes from standard refractive surgery.
    • Combining aberration measurement techniques enhances understanding of LASIK's optical effects.
    • Wave aberration-derived modulation transfer function changes accurately predicted contrast sensitivity alterations.