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The effect of cognitive demand on accommodation

American Journal of Optometry and Physiological Optics

|July 1, 1980

Summary

Cognitive demand increases eye accommodation. When participants performed mental addition without changing visual focus, their eye accommodation levels significantly increased, demonstrating a link between cognitive load and visual system response.

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Area of Science:

Ophthalmology
Cognitive Neuroscience
Human Physiology

Background:

Accommodation, the eye's ability to focus on near objects, is primarily associated with visual stimuli.
The influence of cognitive demand on the accommodation system is not fully understood.
Previous research has primarily focused on visual factors affecting accommodation.

Purpose of the Study:

To investigate whether increased cognitive demand, independent of visual stimulus changes, affects the level of ocular accommodation.
To quantify the change in accommodation in response to a cognitive task.

Main Methods:

An infrared recording retinoscope was used to monitor accommodation in 40 healthy young adults (ages 20-30).
Participants were divided into an experimental group (N=20) and a control group (N=20).
The experimental group engaged in a cognitive task (mental addition) while maintaining visual focus at 40 cm; the control group did not.

Main Results:

The experimental group showed a significant increase in accommodation, with 75% of subjects exhibiting a mean increase of 0.28 D (P < 0.01).
No significant changes in accommodation were observed in the control group.
The observed accommodation increase in the experimental group occurred without any alteration in the visual stimulus.

Conclusions:

Increased cognitive demand can lead to a measurable increase in ocular accommodation.
The study suggests a direct link between cognitive workload and the physiological response of the eye's focusing mechanism.
These findings have implications for understanding visual fatigue and cognitive load interactions.

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