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Updated: Aug 6, 2026
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Published on: March 29, 2022
Effect of aging on stereoscopic interocular correlation
Stéphane Laframboise1, Danielle De Guise, Jocelyn Faubert
1Visual Psychophysics and Perception Laboratory, School of Optometry, Université de Montréal, Montréal, Québec, Canada.
Summary
Normal aging impairs binocular correlation processing, requiring higher interocular correlation (IOC) for stereoscopic vision. Clinical IOC tests may be feasible for assessing this age-related deficit.
Area of Science:
- Vision science
- Ophthalmology
- Gerontology
Background:
- Stereoscopic vision relies on interocular correlation (IOC) for depth perception.
- Normal aging can affect various visual functions, including binocular processing.
Purpose of the Study:
- To evaluate the minimum interocular correlation (IOC) threshold for perceiving stereoscopic stimuli in relation to normal aging.
- To assess the clinical feasibility of testing stereoscopic IOC.
Main Methods:
- Determined stereoscopic IOC threshold in 100 normal observers (ages 10-85) using partially correlated random dot stereograms.
- Stimuli displayed flat surfaces with crossed or uncrossed disparity.
Main Results:
- Older observers (45+) required higher binocular correlation for stereoscopic perception compared to younger groups.
- Aged individuals showed a statistically significant deficit in binocular correlation processing.
- Gender, near point phoria, and fixation disparity did not affect IOC thresholds.
Conclusions:
- Normal aging leads to a deficit in binocular correlation processing.
- Clinical stereoscopic IOC tests appear feasible and may assess different visual processes than standard stereoacuity tests.
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