title: Letter: Color plates, gray plates and intermittent illumination.
mesh_terms: D003119:Color Perception Tests; D003117:Color Vision Defects / Q000209:etiology; D005260:Female; D006801:Humans; D008027:Light; D008297:Male; D008722:Methods; D010783:Photometry; D013997:Time Factors; D014792:Visual Acuity