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November 14, 1931

Dynamic Retinoscopy.

JAMA. 1931;97(20):1486. doi:10.1001/jama.1931.02730200062037

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The author presents the fundamentals of dynamic retinoscopy in contrast to static retinoscopy in a brief but concise manner. The various types of retinoscopes, both American and English, are minutely described and their advantages and disadvantages commented on. The author's dynamic retinoscope is given particular emphasis. It consists of a typical electric retinoscope with a small revolving disk which contains various small figures and letters electrically illuminated by a special device and situated just below the reflecting mirror, and is the object which the patient fixes on when the presbyopic error is estimated. The various heterophorias and the tests for them are thoroughly explained, although there is nothing new offered as to their treatment. Considerable emphasis is placed on the differentiation between accommodation and convergence. Dynamic refraction differs from static refraction in that it is a method of examination for measuring the refraction of an eye, by means of a

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