anisophoria

A type of heterophoria in which the magnitude of the eye misalignment varies depending on the direction of gaze. It can be caused by paresis or spasm of one or more extraocular muscles or by anisometropic spectacle correction, where different prismatic effects induce different phorias in different gaze positions (optical anisophoria). Anisophoria is a form of incomitance, as the angular relationship between the visual axes changes with the fixating eye.