anisophoria(an″ī″sō-fōr′ē-ă) [ aniso- + -phoria]
An eye muscle imbalance in which the horizontal visual plane of one eye is different from that of the other.
1. A type of heterophoria in which the amount varies with the direction of gaze. It may be due to: (a) a paresis or spasm of one or more of the extraocular muscles, or (b) an anisometropic spectacle correction in which different prismatic effects induce different phorias when the eyes look in different directions of gaze (this type is called optical anisophoria).
2. A latent deviation in which the angular relationship between the visual axes of the two eyes is not equal depending upon which eye is fixating. This is a form of incomitance. See prismatic differential effect; incomitance.