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Related Experiment Video

Updated: Jun 2, 2026

Quantification of Oculomotor Responses and Accommodation Through Instrumentation and Analysis Toolboxes

Quantification of Oculomotor Responses and Accommodation Through Instrumentation and Analysis Toolboxes

Published on: March 3, 2023

Accommodation and convergence during sustained computer work.

Juanita D Collier¹, Mark Rosenfield

¹State University of New York, State College of Optometry, New York, New York 10036, USA.

Optometry (St. Louis, Mo.)

|April 26, 2011

Summary

This summary is machine-generated.

Computer vision syndrome (CVS) symptoms may be linked to vergence responses, not accommodation. A slight reduction in vergence response can improve comfort during computer use, impacting CVS.

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Area of Science:

Ophthalmology
Optometry
Ergonomics

Background:

Computer vision syndrome (CVS) is prevalent due to widespread computer use.
The exact physiological mechanisms causing CVS are not fully understood.
Abnormal accommodation and vergence responses are suspected but lack objective evidence.

Purpose of the Study:

To objectively measure accommodation and vergence responses during sustained computer use.
To investigate the relationship between oculomotor function and CVS symptoms.

Main Methods:

Twenty subjects read from a laptop for 30 minutes at 50 cm.
Accommodation response (AR) and associated phoria (AP) were measured every 2 minutes.
Subjects rated task difficulty and discomfort.

Main Results:

Mean accommodation was 1.07 D and mean AP was 0.74∆ base-in (BI).
No significant changes in accommodation or vergence occurred during the 30 minutes.
Lower discomfort correlated with a higher AP (1.55∆ BI), while zero fixation disparity showed greater discomfort (P = 0.02).

Conclusions:

CVS discomfort after 30 minutes was higher in subjects with zero fixation disparity compared to those with a base-in associated phoria.
Accommodation differences did not appear to be related to CVS.
A slightly reduced vergence response may enhance subject comfort during computer tasks.