11 February 2008 Color and contrast sensitivity after glare from high-brightness LEDs
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Proceedings Volume 6844, Ophthalmic Technologies XVIII; 68441R (2008); doi: 10.1117/12.762896
Event: SPIE BiOS, 2008, San Jose, California, United States
Abstract
The color contrast capability was investigated for 3 volunteers with 7 specially developed test charts in red, green, blue, cyan, magenta, yellow and black as a reference, namely without and after glare from 4 colored high-brightness LEDs. Each subject completed 56 tests in order to check especially the ability to discriminate low contrast. It was found that a contrast decrease of one level is equivalent to an increase of about 4 s in the required identification time and in addition a delay time between about 14 s and 16 s has been measured at the beginning of the respective test as a result of the dazzling glare from an LED. In addition trials have been performed with 4 different pseudoisochromatic color plates designed by Ishihara for color vision. These plates have been used to determine temporary color deficiencies after an exposure from a high-brightness LED. For this purpose 40 volunteers have been included in a laboratory test. Color vision was impaired for periods between 27 s and 186 s depending on the applied color plate and respective LED color.
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H.-D. Reidenbach, "Color and contrast sensitivity after glare from high-brightness LEDs", Proc. SPIE 6844, Ophthalmic Technologies XVIII, 68441R (11 February 2008); doi: 10.1117/12.762896; https://doi.org/10.1117/12.762896
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KEYWORDS
Light emitting diodes

Color vision

Light sources

Contrast sensitivity

Visualization

Eye

Visibility

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