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The aim of this study was to assess the extreme effects of tinted lenses oncolour vision by examining changes in chromatic sensitivity when viewing visualdisplays through a slightly tinted (blue-blocking) filter and through a heavilytinted, orange coloured filter. The CAD test was used to measure both red/green(RG) and yellow/blue (YB) chromatic sensitivity in ten subjects when viewingvisual displays through each of the two filters. The measured RG and YB colourthresholds were then compared with similar measurements made without colouredfilters in front of the eye. The blue-blocking filter absorbs only a smallamount of short-wavelength light whilst the orange filter attenuatespreferentially more short wavelength and some middle-wavelength light. Theresults show that the blue-blocking filter does not affect significantly eitherRG or YB colour vision. The orange filter, on the other hand, causes largechanges in colour discrimination. The results were analysed statistically bycomparing results obtained with the coloured filters with those measuredwithout any filters in front of the eye. More experimental work is now neededto establish how much short wavelength light can be removed without affectingsignificantly the subject's colour discrimination performance.

Effects of tinted lenses on chromatic sensitivity: changes in colour vision assessed with the CAD test, a preliminary study