Abstract
WE regret that we were in error in stating that Dr. Ettles was of opinion that Mr. Trattles was not colour-blind. It is interesting to know that he found the colour vision “less good” at a point in the spectrum not far removed from the region where the so-called “red-blind” person has a so-called “neutral band”. The accurate determination of the spectrum range and of the deviations from the normal within that range constitutes the fundamental problem in discriminating colour-blindness. The accuracy of the determination, however, depends upon the methods adopted and the precision of the application of these methods.
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Colour-blindness. Nature 82, 398 (1910). https://doi.org/10.1038/082398b0
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DOI: https://doi.org/10.1038/082398b0
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