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August 27, 1892

GRADATION OF LENSES.Read in the Section of Ophthalmology at the Forty-third Annual meeting of the American Medical Association, held at Detroit, Mich., June, 1892.

Author Affiliations

PROFESSOR OF OPHTHALMOLOGY, OTOLOGY AND MEDICAL JURISPRUDENCE IN THE HOSPITAL COLLEGE OF MEDICINE, MEDICAL DEPARTMENT OF THE CENTRAL UNIVERSITY OF KENTUCKY; SURGEON TO THE EYE AND EAR DEPARTMENT OF THE LOUISVILLE CITY HOSPITAL.

JAMA. 1892;XIX(9):242-243. doi:10.1001/jama.1892.02420090004002b

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Abstract

The gradation of lenses has been a perpetual source of discontent amongst all those who seek scientific accuracy, and the want of a uniform system is universally recognized. I had the honor, at the Ninth International Medical Congress, to read a brief paper on the necessity for reform in the manner of designating lenses, and in conclusion, I suggested the propriety of designating them according to the angle of refraction, as for example: begin with a lens the refracting powers of which equal an angle of 15′; the next in the series 30′; 1°; 1° 30′; 2°; 2° 30′ etc., up to the maximum angle of deviation of the pencil of refracted light. At the Cincinnati meeting of the American Medical Association, in May 1888, I presented the subject in a brief review of the principles, upon which lenses are constructed, and presented a table embracing a series of forty-two

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