Alexandre Reynaud^1,2 (), Paul Colin³, Daniel Gurman¹, Reza Abbas-Farishta³; ¹Dept of Ophthalmology and Visual Sciences, McGill University, ²BRaIN program, Research Institute of the McGill University Health Center, ³École d'Optométrie, Université de Montréal

The perception of depth and objects in space hinges on the collaborative information received from both eyes in the visual system. Stereoscopic acuity, defining the smallest perceivable disparity between the 2 eyes, typically ranges from 30 to 60 seconds of arc in healthy individuals. To perceive stereoscopic vision accurately, the information from the 2 eyes must be received synchronously by the visual brain. This study aimed to uncover the correlation between interocular delay and stereoscopic vision quality in healthy vision. We measured and compared stereosensitivity and interocular delay in 29 healthy adults. Interocular delay was measured using a novel continuous psychophysics paradigm (Burge and Cormack, BioRxiv, 2020). Stereosensitivity was measured using a novel stereotest (Tittes et al., Vision Research, 2019) and the standard Randot Stereotest in 29 healthy adults. Our results suggest that there is no correlation between stereoacuity and interocular delay in our healthy population. Although interocular asynchrony is associated with several binocular vision disorders, we did not observe a correlation between interocular delay and stereoacuity in our healthy population. It is worth noting that, in both of our tests, stereosensitivity was measured using an unlimited presentation time. It is possible that interocular delay has more impact when using shorter presentation times.

Acknowledgements: Startup fund from the Research Institute of the McGill University Health Center