Abstract
Purpose: To determine whether differences in luminance contrast and colour contrast are factors in failing to identify American Optical pseudoisochromatic plates (AOPP).
Methods: We studied two groups of subjects. In 20 normal test subjects with no errors on the AOPP we used cross-polarising filters to darken and then gradually increase perceived luminance of the AOPP until these normal subjects correctly identified the plate. In a second group, to evaluate the relationship between a luminance contrast sensitivity score using Arden plates and AOPP identification, we tested 37 non-colour-deficient subjects who missed zero to five of the AOPP of low colour and luminance contrast (plates 9–12, 15).
Results: Using the cross-polarising filters, we found five plates that required more light to identify (plates 9–12, 15). In the second experiment, we found a significant relationship between the number missed of these five AOPP plates and a decrease in contrast sensitivity (r = 0.91, p<0.001, Spearman correlation coefficient).
Conclusion: Errors in AOPP colour plate detection may be due to loss of ability to perceive colour contrast and possibly luminance contrast.
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Presented at a symposium in London, 29 September 1995, in honour of Professor Geoffrey Arden.
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Wall, M., Donzis, P. Luminance contrast and colour contrast related errors in pseudoisochromatic plate identification. Eye 11, 713–716 (1997). https://doi.org/10.1038/eye.1997.182
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DOI: https://doi.org/10.1038/eye.1997.182