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The bichrome test: Comparing the use of lights as stimulus targets to the use of shadows

1 May 1983


The standard bichrome·(duochrome) test consists of using black letters with a red and 9reen background. The patient is asked. to distinguish the less blurry or more clear letters and therefore uses central fixation to distinguish black letters and an off foveal area to detect red and green. This may contribute to insensitivity to the test and inaccurate spherical findings. The traditional method was compared with a second method in which the letters are red and green and the background is black. The latter was found to be a viable alternative that is more sensitive than the standard test.


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