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Corneal aberrations and visual performance after radial keratotomy

R A Applegate1, H C Howland, R P Sharp

  • 1Department of Ophthalmology, University of Texas Health Science Center at San Antonio 78284-6230, USA. applegate@uthscsa.edu

Journal of Refractive Surgery (Thorofare, N.J. : 1995)
|August 12, 1998
PubMed
Summary

Radial keratotomy surgery significantly increases corneal aberrations, especially in larger pupils, leading to reduced contrast sensitivity. These vision changes are linked to shifts in optical aberration types after surgery.

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Area of Science:

  • Ophthalmology
  • Optometry
  • Corneal Surgery

Background:

  • Refractive surgery and videokeratography enable studying visual performance changes due to corneal shape alterations.
  • Corneal aberrations significantly impact visual quality after surgical procedures.

Purpose of the Study:

  • To quantify the impact of radial keratotomy on visual performance and corneal aberrations.
  • To investigate the relationship between pupil size, corneal aberrations, and contrast sensitivity post-surgery.

Main Methods:

  • Assessed contrast sensitivity (area under the log contrast sensitivity function - AULCSF) and corneal wavefront variance in normal and radial keratotomy eyes.
  • Measured contrast sensitivity using sine-wave gratings and derived wavefront variance from videokeratographs with Zernike polynomials for 3 mm and 7 mm artificial pupils.

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Main Results:

  • Radial keratotomy eyes showed significant pupil size-dependent changes in corneal wavefront variance, increasing substantially with larger pupils.
  • A significant correlation between increased aberrations and decreased contrast sensitivity was observed for a 7 mm pupil, but not for a 3 mm pupil.

Conclusions:

  • Radial keratotomy shifts corneal aberrations from third-order (coma) to fourth-order (spherical), impacting visual quality.
  • Increased optical aberrations and reduced contrast sensitivity after radial keratotomy are more pronounced with larger pupils and are influenced by clear zone diameter.