This study attempts to resolve the conflicting literature relative to contrast sensitivity function (CSF) and soft contact lens wear. Contrast sensitivity was measured at six spatial frequencies for nineteen subjects (38 eyes) when corrected with both spectacles and soft lenses. Measured amounts of residual astigmatism and/or sphere were corrected using a trial frame and lenses. Additionally, data was evaluated on more than one occasion in order to investigate the effect of time upon visual performance with the lenses. The results indicate a measurable decrease in contrast sensitivity for only the highest of the spatial frequencies tested (22.8 cycles/degree) when soft lenses were worn. For those eyes demonstrating a clinically significant decrease in contrast sensitivity, responsibility appears to be shared by both the contact lens and the cornea. There were no significant changes in CSF over time.
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