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Corneal first surface optical aberrations and visual performance.

R A Applegate1, G Hilmantel, H C Howland

  • 1Department of Ophthalmology, University of Texas Health Science Center at San Antonio, 78230-6230, USA. applegate@uthscsa.edu

Journal of Refractive Surgery (Thorofare, N.J. : 1995)
|October 6, 2000
PubMed
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Corneal wavefront analysis accurately predicts visual performance across various corneal conditions. Increased wavefront variance, regardless of cause, correlates with decreased vision, especially in larger pupils.

Area of Science:

  • Ophthalmology
  • Optometry
  • Corneal Physiology

Background:

  • Refractive surgery can induce significant corneal aberrations, primarily symmetric ones, impacting visual performance.
  • The generalizability of these findings to conditions with asymmetric aberrations (like coma) is unclear.

Purpose of the Study:

  • To assess the utility of corneal first surface wavefront analysis in predicting visual performance.
  • To determine if wavefront analysis is broadly applicable across diverse corneal conditions.

Main Methods:

  • Corneal videokeratography was performed on 91 participants (13 normal, 78 with various corneal conditions).
  • Corneal first surface wavefront variance was calculated for 3 mm and 7 mm pupils.
  • Visual performance was measured using contrast sensitivity and high/low contrast acuities.

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Main Results:

  • Significant correlations were found between corneal wavefront variance and all visual performance measures.
  • These correlations were stronger for a 7 mm pupil compared to a 3 mm pupil.

Conclusions:

  • Corneal wavefront variance is a reliable predictor of visual performance, irrespective of the underlying corneal condition.
  • The impact of wavefront variance on vision is pupil size-dependent, with greater effects observed in larger pupils.