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Article
November 21, 1896

A Prevalent Error in Refraction Work.

JAMA. 1896;XXVII(21):1115. doi:10.1001/jama.1896.02430990039010

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Abstract

Minneapolis, Minn., Nov. 16, 1896.

To the Editor:  —I have been strongly impressed for some years with the fact that many oculists, some of whom are scientific and careful men, are in the habit of over-correcting plus refractive errors. For a shorter period I have been convinced that most oculists, myself included, have been giving low plus cylinders where minus lenses were indicated.This error has grown out of the teaching of our text books that at six meters or twenty feet the rays of light are approximately parallel, and that for the correction of refractive errors the strongest plus or the weakest minus glass should be given which give the clearest vision at this distance.Charles S. Bull, I think, called attention to the fact this rule would lead to an over-correction of .25 D. in the case of H., but the fact has evidently not been sufficiently impressed. With

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