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Simply to see or not to see represents a stark and shadowless difference between sight and blindness. On the other hand, significant gradations and colors in the efficacy of the visual system too often emerge ill-defined and blurred as the physician tries to interpret scientific finding in the light of professional judgment. This he has been doing in appraising visual impairment that is congenital or brought on by injury or disease.
How does a person's visual deficiency influence his ability to live a normal life? How do you evaluate the degree of impairment of this ability? For many years doctors and laymen have tried to answer these questions in efforts to bring about equitable decisions by such organizations as the Veterans Administration, insurance firms, the Social Security Administration, and workmen's compensation boards.
The medical profession now has a new gauge. This is a guide to the evaluation of permanent impairment
ANOTHER MEDICAL GUIDELINE. JAMA. 1958;168(4):414-415. doi:10.1001/jama.1958.03000040050012