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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

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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.

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.