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April 22, 1899, Vol XXXII, No. 16 >
ARTICLE | April 22, 1899

SLOWNESS OF PERCEPTION OF SIGNALS.

JAMA. 1899;XXXII(16):887. doi:10.1001/jama.1899.02450430041014.
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ABSTRACT

The Philadelphia Medical Journal (March 25) contains an item in regard to the examination of railway employes which suggests a very possible danger that has been hitherto largely overlooked. Dr. Valentine, of the Long Island Railroad, finds that while color-blindness, heretofore regarded as the chief element of peril, is comparatively rare, it is not uncommon to meet with abnormal slowness of sight or limited range of vision. Most of those with these defects are those of middle life or beyond. Slowness of perception of danger signals would naturally be as serious a cause of risk as partial color-blindness and it is a little remarkable that more has not been made of it than is the case. The difficulty being throughout a psychic one, as some have thought color-blindness might be in some cases, it is not hard to conceive its occurrence in the early stages of general decadence. At the

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