Saturday, November 7, 2026

2:00 PM - 2:15 PM

Ballroom 1 and 2

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Overview

Jacinta Walz

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Details

Convergence near point is a staple of orthoptic practice however this dynamic oculomotor system is reduced to a binary marker at break and recovery points where the complex relationships between convergence, accommodation, and pupil constriction are left unmeasured and largely misunderstood. The coordination of these neural circuits may be distributed across neural centres or coordinated by one common centre, akin to a conductor leading an orchestra, however it is unclear which element of the near triad (convergence, accommodation, or pupil constriction) leads this coordination. The advent of wearable video-based eye-trackers allows us the opportunity to measure oculomotor and pupillary dynamics with a high degree of precision. We present here a pilot study of a new Digital Spot Card prototype. Participant eye position and pupil size is recorded during a novel convergence task in free space, following a 2cm diameter circular target approaching from 68cm away, along the midline. The automated stimulus approaches in a smooth movement, and at different rates across trials. By using a standardised automated stimulus we can know with certainty the target location and precisely measure binocular and monocular tracking accuracy in both the temporal and spatial domains. In combining subjective responses of blur and diplopia with objective measures of ocular position and pupil responses, we have greater insight into the how each member of the near triad functions, how they coordinate to act together, and propose greater measurable understanding of what happens when these systems breakdown.

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Speaker