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No more fascinating servomechanism exists in nature than the reactions of the ocular pupil under physiologic conditions. Under pathologic conditions, disturbance of this mechanism can provide useful information to the trained observer. Even the untrained observer should be alerted by the presence of any alteration of the pupillary reaction to light. Lemoine has stated that inequality of the pupils is the most important single sign that the lay observer can detect upon superficial examination of the eyes.
The information contained in the present compact monograph is not new; most of it has long been available to medical students, physicians, and physiologists. What is new and useful is the organization of material that had formerly been scattered throughout many voluminous texts into a manageable, cohesive, and readable form. Simple language, orderly sequence, and lucid illustrations draw the reader through these pages by the magnetism of his own curiosity and the promise
Allen HF. The Pupil.. Arch Ophthalmol. 1973;89(3):261-262. doi:10.1001/archopht.1973.01000040263026