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Corneal asphericity and visual function after wavefront-guided LASIK.

Kuang-mon Ashley Tuan1, Dimitri Chernyak

  • 1VISX, Incorporated, Santa Clara, CA, USA. ashley.tuan@amo-inc.com

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|August 16, 2006
PubMed
Summary

Corneal asphericity does not significantly impact visual acuity or contrast sensitivity after wavefront-guided LASIK. Customized corneal shapes, rather than standard conics, are more likely to yield better visual outcomes.

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Area of Science:

  • Ophthalmology
  • Refractive Surgery
  • Corneal Physiology

Background:

  • A theory suggests corneal asphericity dictates visual function, with a prolate shape being optimal.
  • This theory posits that altering the cornea from prolate to oblate negatively affects visual results.

Purpose of the Study:

  • To analyze the impact of corneal asphericity on visual function after wavefront-guided LASIK.
  • To investigate the correlation between corneal shape (Q-value) and visual outcomes.

Main Methods:

  • Retrospective analysis of 160 myopic eyes undergoing wavefront-guided LASIK.
  • Corneal topography, visual acuity, and contrast sensitivity measured pre- and post-surgery.
  • Multivariate regression analysis to correlate Q-value with visual function.

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Main Results:

  • Preoperative corneas were generally prolate; postoperative corneas were equally divided between prolate and oblate.
  • No statistically significant correlation found between corneal shape (Q-value) and visual acuity or contrast sensitivity.
  • Changes in corneal asphericity post-surgery did not significantly correlate with changes in visual acuity or contrast sensitivity.

Conclusions:

  • Visual acuity and contrast sensitivity after wavefront-guided LASIK are independent of corneal asphericity.
  • Neither preserving nor inducing specific corneal asphericity guarantees improved visual outcomes.
  • Customized corneal shapes appear more promising for better visual results than standard conic shapes.