This article is only available in the PDF format. Download the PDF to view the article, as well as its associated figures and tables.
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
REYNOLDS DS. 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. JAMA. 1892;XIX(9):242–243. doi:10.1001/jama.1892.02420090004002b
Customize your JAMA Network experience by selecting one or more topics from the list below.
Create a personal account or sign in to: