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Luminance changes of the fundus reflex.

American Journal of Optometry and Physiological Optics

|December 1, 1975

Summary

A new recording retinoscope measured fundus reflex luminance during tasks. Accommodation significantly impacted luminance, while reading comprehension did not, but task changes did.

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Area of Science:

Ophthalmology
Optometry
Visual Neuroscience

Background:

The fundus reflex, a key indicator in visual assessments, has luminance that may vary with cognitive tasks.
Previous research suggested a link between reading comprehension and fundus reflex luminance, but empirical evidence is limited.

Purpose of the Study:

To develop and utilize a recording retinoscope to quantify fundus reflex luminance during cognitive tasks.
To investigate the influence of pupil changes, accommodation, and task type on fundus reflex luminance.

Main Methods:

A novel recording retinoscope was employed to measure fundus reflex luminance.
Ten student subjects participated, engaging in reading graded passages and an addition task.
A reversal design was implemented to analyze the effects of pupil size and accommodation.

Main Results:

Significant changes in fundus reflex luminance were observed, primarily attributed to accommodation.
Reading comprehension did not correlate with fundus reflex luminance as hypothesized.
Shifting from reading to an addition task led to an increase in fundus reflex luminance.

Conclusions:

Accommodation is a major factor influencing fundus reflex luminance.
The relationship between cognitive load and fundus reflex luminance requires further investigation, particularly regarding task demands.

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