Nineteen colored lenses were examined for their effect on color discrimination. Eighteen subjects we reevaluated by two tests; the Roth 28-hue test and the Nagel anomaloscope. On the basis of the anomaloscope findings, eleven of the 19 lenses significantly altered color discriminatory ability. The 28-hue test, though less sensitive than the anomaloscope, is probably a better estimate of environmental function. According to this test, none of the lenses tested altered color perception enough to severely limit t heir usefulness, but did indicate a change in subjective color sense with many of the lenses. The lenses most severely affecting color discrimination were the plastic counterparts of many commercially available tints. In general, the lower the transmission of a given lens, the greater the decriment in performance. The authors recommend discretion in lens choice based on their findings. Color defective individuals and those requiring a high degree of color perception are especially vulnerable and are advised against any but the light pink tints.
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