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Article
May 1954

CLI NICAL EVALUATION OF THE RODENSTOCK REFRACTOMETER

Author Affiliations

CINCINNATI; CHICAGO
From the Department of Ophthalmology, Illinois Eye and Ear Infirmary of the University of Illinois College of Medicine.

AMA Arch Ophthalmol. 1954;51(5):695-700. doi:10.1001/archopht.1954.00920040705014
Abstract

IN THE PAST there have been numerous attempts to design a refractometer which would simplify the objective determination of the ocular refraction. Previously designed metering devices have offered speed of examination, but they have not attained the accuracy of good retinoscopy. The most recent machine is the Rodenstock refractometer (Fig. 1), which is founded on the principles set forth by Schmidt-Rimpler in 1877. An illuminated test plate is placed at the principal focus of a convex lens placed before the eye, so that parallel rays enter the eye and in emmetropia come to a sharp focus on the retina. From this sharp retinal image, parallel rays emerge from the emmetropic eye and are focused by the convex lens in the manner of indirect ophthalmoscopy at the position of the test plate. In myopia the test plate must be moved closer to the convex lens to obtain a clear retinal image,

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