Anisophoria is defined as that form of heterophoria in which the degree of muscular imbalance of the eyes varies with the direction of gaze. The existence of motor anomalies of this type is well known to the medical profession, but their analysis as a special group and their systematic treatment by optical means has not heretofore been attempted. For this reason it seems not inappropriate to segregate this particular group under a new name. In general, anisophoria is known to occur in two groups of cases: (a) The first group comprises cases in which the heterophoria is due to paresis or spasm of one or more of the extraocular muscles. In these there may be an average overall amount of heterophoria which may be corrected with prisms, leaving a smaller or larger amount of uncorrected heterophoria of opposite sign in opposite quadrants of the field of view. (b) The
FRIEDENWALD JS. DIAGNOSIS AND TREATMENT OF ANISOPHORIA. Arch Ophthalmol. 1936;15(2):283–307. doi:10.1001/archopht.1936.00840140133009
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