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Henry B. Abbott, M.D.

Arch Ophthal. 1941;25(2):331-332.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

The measurement of accommodation and of convergence should be a routine procedure in the ophthalmologic examination. Many instruments and methods have been devised for this purpose. In 1885 Landolt¹ described his dynamometer, an ingenious but rather awkward apparatus. Since then there have been many others, including the ergograph of Berens, Hardy and Pierce,² a refined apparatus for making graphic studies of the fatigue of these two functions. Most of my associates, however, use the Prince rule or a similar one. These rules, which are somewhat over 50 cm. long, always impressed me as being rather awkward to handle, and for some time I have thought about devising a small pocketable instrument.

The instrument³ finally devised consists of a semirigid flexible steel tape which rolls up on a spring reel into a black metal case. The tape is stamped with centimeter graduations on one of its flat surfaces . . . [Full Text PDF of this Article]

Author Affiliations
Brooklyn

From the Long Island College of Medicine.

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