ABSTRACT An intermittent exotrope of 54Δ had harmonious anomalous correspondence when squinting and normal correspondence when bifoveally fixating. Measures of the angle of deviation (H) and angle of anomaly (A) were made at the first postoperative dressing 6 hr after surgery (H = 8–14Δ esotropia, A = 0–54Δ exo) and at several times over a 2.5‐mo period during which a second operation was performed. The final result was 3Δ of exophoria with normal correspondence when fusing and harmonious anomalous correspondence (A = 3Δ exo) when fusion was disrupted. The change in angle of anomaly created by the surgery cannot be explained by changes in fusional vergence. Hallden's “sensory‐fusion” mechanism, which is based on diplopia resulting from stimulation of disparate retinal points, is more useful in explaining the obtained results.
Flom et al. (1978) studied this question.