FURTHER OBSERVATIONS ON THE HEMIOPIC PUPILLARY REACTION OBTAINED WITH A NEW CLINICAL INSTRUMENT

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Abstract
The need of such a test as the hemiopic pupillary reaction, if it holds in cerebral cases any of the topical diagnostic possibilities originally suggested by Heddaeus and later elaborated by Wernicke,1is so great that no labor should be spared fully to estimate the value of every promise it may offer. In a paper2before this Section last year a complete historical summary and bibliography were given of this subject and of the Wilbrand test.3 PREVIOUS OBSERVATIONS It will suffice here to recall some cardinal points from the researches of previous observers. Most important was the work of Hess in clearly showing what a great stumbling-block the phenomenon of dispersion light within the eye media had been in both making and interpreting observations, and, since it has been frequently noticed in discussion that this phenomenon is still apparently a hazy concept to many, it may be

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