In this admirable text the author has made an effort to set forth clearly the state of present knowledge of the clinical physiology of the ocular motor system and the conclusions that can be safely drawn from the facts available. Confronted with a neuro-ophthalmologic problem, one must note all obvious objective signs, elicit less apparent signs and correlate these findings with the known anatomy and physiology of the nervous system to evolve a clinical concept. The author has accomplished this goal after the manner of a lecturer and true research worker. He has analyzed problems personally encountered in one of the largest and most active neurologic services in the country, in the light of the physiology and anatomy recorded in the literature. Every conclusion is documented either by personal experience or by experiments and thorough review of the literature.
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Cogan David G (1949) studied this question.