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"Time to See" in Infantile Nystagmus
Katherine Ward1, Lee McIlreavy1, Matt J Dunn1
1School of Optometry and Vision Sciences, Cardiff University, Cardiff, United Kingdom.
Investigative Ophthalmology & Visual Science
|May 7, 2026
Summary
People with infantile nystagmus (IN) require more time to see visual targets, and this "time to see" increases with IN severity. This finding suggests a new way to measure visual function in IN patients.
Area of Science:
- Ophthalmology
- Neuroscience
- Vision Science
Background:
- Infantile nystagmus (IN) is an involuntary eye movement condition.
- Current interventions for IN offer limited improvements in visual acuity (VA).
- The fovea's oscillation in IN introduces a temporal aspect to vision.
Purpose of the Study:
- To investigate if viewing time to resolve stimuli is increased in individuals with IN.
- To determine if this "time to see" measure correlates with IN severity.
Main Methods:
- Psychophysical measurement of exposure duration thresholds (viewing times) for 18 individuals with IN and 14 controls.
- Optotype orientation discrimination task at varying spatial frequencies relative to individual VA.
- Gaze position analysis (null zone vs. away from null zone) to assess IN severity's effect.
Main Results:
- Individuals with IN had significantly longer exposure duration thresholds than controls.
- Exposure duration thresholds increased significantly with IN intensity.
- These effects were most pronounced for optotypes sized relative to participant VA.
Conclusions:
- "Time to See" is elevated in infantile nystagmus.
- This measure is sensitive to changes in IN severity within individuals.
- Exposure duration threshold may serve as a valuable metric for assessing visual function in IN.
