Unfortunately, in the various state acts relating to blind persons there is such a wide variation in the definition of blindness and in the procedure by which the blindness of an individual is determined that it has been extremely difficult, if not impossible, to gather together data of such a nature that they can be studied on the basis of any uniform standard.
In an effort to overcome this difficulty and to establish a uniform definition of blindness and classification of the causes of blindness, there was organized some years ago a Committee on Statistics, a body composed of representatives of the American Foundation for the Blind, the National Society for the Prevention of Blindness, the American Association of Workers for the Blind and the Statistical Committee of the Section on Ophthalmology of the American Medical Association. Out of the deliberations of this committee have come certain recommendations and suggestions
COWAN A, SINCLAIR SM. CAUSES OF BLINDNESS IN PENNSYLVANIA: FROM THE MEDICAL AND SOCIAL ASPECTS. JAMA. 1936;107(10):757–760. doi:10.1001/jama.1936.02770360003002
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