Glasses Let Color-Blind See Red Light (Sep, 1940)
Glasses Let Color-Blind See Red Light
TO ENABLE color-blind motorists to determine whether a traffic light is red or green, a New York City optical firm has just introduced special glasses. The spectacles are made in two sections, the upper consisting of a segment of dark-red filter glass, and the lower of clear crown glass, although optically ground eye-correction lenses may be employed for those who ordinarily wear glasses when driving. With the spectacles on, the color-blind driver looks through the red filter section of the lenses as he approaches a traffic light. If he sees any light at all in the traffic standard, he knows that it must be either red or amber, the “stop” or “caution” signal, since the filter blocks out all rays emanating from the green “go-ahead” light, while admitting the others. Since eye specialists estimate that one person in every twenty-five is colorblind, the filter glasses should make an important contribution to the problem of increasing traffic safety.