Contrast sensitivity in radial keratotomy

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Abstract
In a prospective study, contrast sensitivity function was determined before and one month postsurgery in 15 consecutive cases of radial keratotomy. The results obtained pre-operatively were compared to those of an age-matched, emmetropic reference group also comprising 15 persons. Three different test conditions were employed. High luminance background levels of 130 cd/m2, low luminance levels of 3.5 cd/m2 and low luminance levels completed with a central glare source of 7.5 lux. Using an eight-incisional radial keratotomy technique with a 3 mm optical zone, a median reduction in myopia of 3.5 diopters was observed. Corrected visual acuity was not affected by the surgery. The contrast sensitivity functions of the myopic group pre-operatively compared to the post-operative values showed no significant difference for any of the three test conditions. Compared to the reference group, the myopic group pre-operatively demonstrated a statistically significant reduced contrast sensitivity for all test conditions.

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