Current trends towards fashion tints and tinted lens prescription writing for today's eye wear has prompted a need for an evaluation of the effect that the tint will have on acuity. In this study, subjects were provided best visual acuity spectacle correction for their refractive error and tested f under two lighting conditions (10 fL and 0.1 fL) and eight contrast levels (95.2% and 11.0%). Acuity measurements were taken using Snellen acuity letters having approximately the same error scores. Three color tints of CR-39 (blue, brown, and grey) at two color densities (#1 and #2) were studied. A clear lens was. used as a control. Subjects records were analyzed in five age group categories.
At the l0 fL luminance level, neither of the blue tints showed a marked effect on acuity at the higher contrast levels, but did show an increasing effect as the contrast level was reduced. The brown tints induced a similar but more pronounced effect than the blue tints at the l0 fL luminance level while the findings through the grey tints were inconsistent.
Decreasing the luminance level to 0.1 fL had the most dramatic effect on visual acuity. The effects of the colors on visual acuity were studied and found not significant under these achromatic test conditions. The loss of visual acuity has been found to be directly related to the decrease in transmittance of the tinted lenses.
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