Colour contrast thresholds are normal in functional amblyopia

Eye
E MangelschotsW Spileers

Abstract

We evaluated colour contrast thresholds in patients with unilateral functional amblyopia. A computer-controlled colour vision test was used to determine colour contrast thresholds along a blue-yellow tritan axis. Prior to the threshold measurement, a heterochromatic flicker brightness test was performed to ensure isoluminance between the test stimulus and the background for every subject individually. Luminance contrast thresholds were also measured using the same computer-based system. Twenty amblyopic patients were tested. All showed normal tritan colour contrast thresholds both for their amblyopic eye and non-amblyopic fellow eye. Luminance contrast thresholds were elevated in all 6 refractive amblyopic eyes, in 4 of 9 strabismic eyes and in 2 of 5 mixed amblyopic eyes. Colour contrast thresholds are normal in functional amblyopia (with central fixation). Whenever elevated tritan colour contrast thresholds are found in patients with a decreased visual acuity, other causes of visual impairment are to be evaluated.

References

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Citations

Feb 24, 2012·The Journal of Neuroscience : the Official Journal of the Society for Neuroscience·Lawrence C SincichJonathan C Horton
Apr 10, 2010·American Journal of Ophthalmology·Yehoshua Almog, Arie Nemet
Jan 24, 2015·Vision Research·Brian AllenBas Rokers

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