The importance of pupil size in optical quality measurements following radial keratotomy.

This review considers the importance of pupil size when specifying the optical quality or visual performance of eyes following radical keratotomy. The experimental evidence presented includes measurements both before and after radial keratotomy of the eye's: 1) corneal curvature; 2) optical aberrations; 3) modulation transfer function; 4) visual acuity as a function of test beam entry; and 5) disability glare. Together these five lines of evidence demonstrate that pupil size is a key factor influencing both the optical quality of the eye and visual performance.