“…It has been proposed that partial sensory deprivation, including VF or acuity deficits, may cause or exacerbate sensory heterophorias and heterotropias. 13 We found that VA, in particular acuity less than 20/200 in one or both eyes, was associated with preoperative tropias. It is not surprising that monocular status is significantly associated with tropias at baseline, as binocular fusion can maintain ocular alignment in the presence of a phoria but the deviation manifests as a tropia when binocular fusional control is not present.…”