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Related Experiment Videos

Visual performance after photorefractive keratectomy. A prospective study

W Verdon1, M Bullimore, R K Maloney

  • 1Jules Stein Eye Institute, University of California, Los Angeles, USA.

Archives of Ophthalmology (Chicago, Ill. : 1960)
|December 1, 1996
PubMed
Summary

Photorefractive keratectomy (PRK) significantly reduces low-contrast vision more than high-contrast vision. Low-contrast visual acuity is a sensitive indicator for assessing refractive surgery outcomes.

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Area of Science:

  • Ophthalmology
  • Refractive Surgery
  • Corneal Surgery

Background:

  • Excimer laser photorefractive keratectomy (PRK) is a common refractive surgery procedure.
  • Assessing visual performance post-PRK requires sensitive measures beyond standard high-contrast visual acuity.
  • Understanding the impact of PRK on visual quality, especially under challenging conditions, is crucial for patient outcomes.

Purpose of the Study:

  • To prospectively evaluate the effect of excimer laser PRK on best-corrected visual performance.
  • To utilize psychophysical tests sensitive to image degradation, comparing them to high-contrast Snellen visual acuity.
  • To investigate visual outcomes under conditions simulating reduced lighting and glare.

Main Methods:

  • A prospective case series involving 18 myopic subjects undergoing PRK.

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  • Visual performance was assessed using high-contrast and low-contrast visual acuity and contrast sensitivity.
  • Measurements were repeated pre-PRK and at 3, 6, and 12 months post-PRK, with and without pupil dilation and glare.

    • Main Results:

    • One year after PRK, best-corrected high-contrast visual acuity decreased by half a line (P = .01).
    • Best-corrected low-contrast visual acuity showed a greater reduction of 1.5 lines (P = .002).
    • Reduced low-contrast acuity, particularly with dilated pupils and glare, correlated with ablation zone decentration, linking corneal topography to functional outcomes.

    Conclusions:

    • Post-PRK, low-contrast visual acuity losses are significantly more pronounced than high-contrast visual acuity losses.
    • Low-contrast visual acuity serves as a sensitive metric for evaluating the success and safety of refractive surgery.
    • Corneal topography and ablation decentration influence functional visual outcomes after PRK.