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No muscles in the body require more careful study, evaluation, and knowledge of coordination and intimate physiology than the eight eye muscles, particularly those involving the vertical movement of the eyes. Each patient requires individual and critical study which should not become mere routine.
The author has prepared a guide, particularly to vertical anomalies of the eyes, with the assessment of the probabilities of relief by orthoptics or surgery or both.
After analyzing the various and sometimes subtle components of vertical deviations such as fusion, fixation, abnormal vertical stimulation, and dissociated deviations in 600 concomitant and paralytic types of defects, he describes his methods of investigation, examination, and desirable choice of operation for each defect. His chapters on surgery of the oblique muscles should be used as a constant guide to the ophthalmic surgeon interested in obtaining not only a cosmetic but also a good, well balanced, functioning result. His
Perritt RA. Ocular Vertical Deviations and the Treatment of Nystagmus. JAMA. 1960;173(1):123. doi:10.1001/jama.1960.03020190125043