The perception of isoluminant coloured stimuli of amblyopic eye anddefocused eye

摘要

In routine eye examination the visual acuity usually is determined using standard charts with black letters on a whitebackground, however contrast and colour are important characteristics of visual perception. The purpose of research wasto study the perception of isoluminant coloured stimuli in the cases of true and simulated amlyopia. We estimateddifference in visual acuity with isoluminant coloured stimuli comparing to that for high contrast black-white stimuli fortrue amblyopia and simulated amblyopia. Tests were generated on computer screen. Visual acuity was detected usingdifferent charts in two ways: standard achromatic stimuli (black symbols on a white background) and isoluminantcoloured stimuli (white symbols on a yellow background, grey symbols on blue, green or red background). Thusisoluminant tests had colour contrast only but had no luminance contrast. Visual acuity evaluated with the standardmethod 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 opticallenses placed in front of the normal eye. The obtained results applying the isoluminant colour charts revealed worseningof the visual acuity comparing with the visual acuity estimated with a standard high contrast method (black symbols on awhite background).