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Related Experiment Videos

Mesopic contrast sensitivity function after excimer laser photorefractive keratectomy.

Robert Montés-Micó1, W Neil Charman

  • 1Unitat d'Optometria i Ciències de la Visió, Universitat de Valencia, Spain. roberto.montes@uv.es

Journal of Refractive Surgery (Thorofare, N.J. : 1995)
|February 7, 2002
PubMed
Summary

Photorefractive keratectomy (PRK) significantly reduces mesopic contrast sensitivity in myopia patients, even with normal photopic vision. This visual impairment occurs despite successful refractive correction.

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Area of Science:

  • Ophthalmology
  • Vision Science

Background:

  • Myopia correction using excimer laser photorefractive keratectomy (PRK) is a common procedure.
  • Assessing visual function post-PRK, particularly contrast sensitivity under varying light conditions, is crucial for understanding visual outcomes.

Purpose of the Study:

  • To evaluate contrast sensitivity under mesopic conditions in patients who underwent uncomplicated PRK for myopia.
  • To compare mesopic and photopic contrast sensitivity in PRK patients versus a control group.

Main Methods:

  • Monocular contrast sensitivity was measured using the Stereo Optical F.A.C.T. chart in 26 PRK patients and 8 emmetropic controls.
  • Measurements were taken at four luminance levels (85, 5.0, 2.5, and 0.1 cd/m2) 6 months post-surgery.
  • Statistical analysis compared contrast sensitivity at various spatial frequencies between groups.

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Main Results:

  • PRK patients showed a statistically significant reduction in contrast sensitivity under mesopic conditions (5.0, 2.5, 0.1 cd/m2) compared to controls (P < .01).
  • No significant differences in contrast sensitivity were observed between groups under photopic conditions (85 cd/m2) (P > .01).

Conclusions:

  • Excimer laser photorefractive keratectomy can lead to significant reductions in contrast sensitivity under mesopic conditions.
  • Photopic contrast sensitivity remains normal after PRK, indicating a specific impact on low-light vision.