It is estimated that over one million persons in the United States have undiagnosed glaucoma.1 This is about 2% of all persons over 40. The number of cases in persons under 40 is negligible, but the incidence increases rapidly with increasing age. Because we have an aging population, because glaucoma is a leading cause of blindness acquired after 40, and because early recognition is essential if blindness from this cause is to be prevented, screening programs are being used on an ever-increasing scale. The disease is insidious in that there is usually no pain and the progressive narrowing of the visual fields is not appreciated by the victim until it is far advanced. We are here referring to chronic simple or open-angle glaucoma, which is the commonest type.
Since there are not enough trained ophthalmologists to screen the entire population over 40, it has been necessary to devise a
GLAUCOMA. JAMA. 1958;166(11):1333. doi:10.1001/jama.1958.02990110069014
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