Published Paper Details:

Aim: To determine binocular summation of surgically treated intermittent Esotropia (ET) patients by measuring the Visual acuity threshold. Introduction: Intermittent Esotropia (IET) is a disorder of ocular misalignment. It manifests frequently when one views a distant visual target or has illness or fatigue, but maintains a good alignment and binocular fusion when focusing on the visual target for near. So, their otherwise normal vision function can be disrupted intermittently by a sudden inward deviation of one eye (1). During the intermittent deviation of one eye, binocular fusion gets interrupted. To prevent diplopia, the brain begins to suppress visual information from the peripheral temporal retina in each eye (3-5). The suppression can eventually become permanent and worsen fusion. Method: We enrolled 38 ET patients who had undergone strabismus surgery at least a year prior to this study, including 21 with good alignment and 17 with recurrence after their surgery, ranging from 12 to 48 months. The patients with good alignment were defined as eso-deviation <= 10 prism diopter (pd) and no vertical misalignment both at near and distance viewing; while with recurrence were those whose eso-deviation more than 10 pd at near (33 cm) or distance (6 m) viewing (13). All of these patients had been successfully corrected at 3-month post-surgery, which is the routine follow-up time for assessment, and a detailed examination would be performed at that time. Moreover, we recruited 20 normal subjects, who had matched age and refractive diopter, as controls. Result: The BCVA of all the enrolled participants were >= 20/20. Based on their post- operative esodeviation, we divided the participants into two groups: those with recurrence and those with good alignment. The participants with recurrence (17 patients) ET post operative BiS have diplopia or decreased BiS after the range of time (12-48 months). The eso-deviation of ET good alignment was mean deviation of 0 to 10 pd at 33 cm and 0 to 10 pd at 6 m. While for the patients with recurrence, it was 11 to 25 pd for near and 11 to 20 pd for distance, respectively. There was a significant difference in the extent of near and far eso-deviation in patients with recurrent eso-drift compared to those with good alignment .