Differences of ocular sensory dominance between normal people and intermittent exotropia

Abstract

Purpose : To quantify ocular sensory dominance and investigate its differences between normal people and intermittent exotropia.

Methods : A total of 159 subjects(normal group and IXT group) participated in the study. Ocular dominance was measured by a continuous flashing technique, with the tested eye viewing a Gabor patch increasing in contrast, and the fellow eye viewing a Mondrian noise decreasing in contrast. In each trial, the log ratio of Mondrian to Gabor’s contrasts was recorded as a subject first detected the Gabor.We collected 50 trials for each eye and an interocular difference was analyzed with a rank-sum test. The z-value was used as the ocular dominance index (ODI) to quantify the degree of ocular dominance. A subject with ODI≥2 was categorized as having a clear ocular dominance, and a subject with ODI<2 was considered as having balanced eyes (unclear dominance).

Results : Between two groups, the percentage of subjects with clear ocular dominance in intermittent exotropia was 60.98% (50/82), which was significantly higher than that in the normal sbjects (51.95%, 40/77), and the ODI of intermittent exotropia was 2.83±1.55,which was significantly higher than that of the normal subjects (2.10±1.45, T=3.05, p=0.002).

Conclusions : Compared with the normal subjects, the differences of ocular sensory dominance with intermittent exotropia were more significant.

This abstract was presented at the 2024 ARVO Annual Meeting, held in Seattle, WA, May 5-9, 2024.

 

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