What can be done for the color blind?
D003117:Color Vision Defects / Q000534:rehabilitation; D006233:Persons with Disabilities; D006801:Humans; D010783:Photometry; D012050:Rehabilitation, Vocational; D012168:Retinal Pigments / Q000096:biosynthesis; D012682:Sensory Aids
D012168:Retinal Pigments