Abstract
This study examines the extent to which a Zernike-based optical correction can restore acuity in keratoconus as a function of disease severity and contrast level. Increasingly complete Zernike corrections in the presence of Zernike-fit error were simulated. Acuity for keratoconic eyes with maximum corneal power reached with a fifth-order Zernike correction under high-contrast conditions and exhibited a loss of 0.1 logMAR (minimum angle of resolution) (from to ) for low-contrast conditions. Acuity for keratoconic eyes with maximum corneal power approached with sixth–tenth-order corrections under high-contrast conditions but did not return to similar levels with a tenth-order correction for low-contrast conditions. The results suggest that fit error affects visual performance for more difficult tasks and that restoring high-contrast acuity ( or better) using a fifth-order Zernike correction is not limited by Zernike-fit error for over 88% of keratoconus cases.
© 2006 Optical Society of America
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