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In routine eye examination the visual acuity usually is determined using standard charts with black letters on a white
background, however contrast and colour are important characteristics of visual perception. The purpose of research was
to study the perception of isoluminant coloured stimuli in the cases of true and simulated amlyopia. We estimated
difference in visual acuity with isoluminant coloured stimuli comparing to that for high contrast black-white stimuli for
true amblyopia and simulated amblyopia. Tests were generated on computer screen. Visual acuity was detected using
different charts in two ways: standard achromatic stimuli (black symbols on a white background) and isoluminant
coloured stimuli (white symbols on a yellow background, grey symbols on blue, green or red background). Thus
isoluminant tests had colour contrast only but had no luminance contrast. Visual acuity evaluated with the standard
method and colour tests were studied for subjects with good visual acuity, if necessary using the best vision correction.
The same was performed for subjects with defocused eye and with true amblyopia. Defocus was realized with optical
lenses placed in front of the normal eye. The obtained results applying the isoluminant colour charts revealed worsening
of the visual acuity comparing with the visual acuity estimated with a standard high contrast method (black symbols on a
white background).
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Gunta Krumina, Maris Ozolinsh, Gatis Ikaunieks, "The perception of isoluminant coloured stimuli of amblyopic eye and defocused eye," Proc. SPIE 7142, Sixth International Conference on Advanced Optical Materials and Devices (AOMD-6), 714216 (2 December 2008); https://doi.org/10.1117/12.815794