The relation of vergence effort to reports of visual fatigue following prolonged near work.

Abstract:

:Two experiments examined the link between vergence effort and subjective reports of visual fatigue following prolonged near work. In Experiment 1, dark vergence and reports of visual fatigue symptoms associated with computer use were measured in 104 persons. Dark vergence was significantly correlated with four of six symptoms of visual fatigue. In Experiment 2, 16 subjects who exhibited clear "Heuer effects" (systematic gaze-related changes in dark vergence) read from a video display terminal (VDT) at a distance of 20 cm for 60 min under two gaze elevation conditions: 20 deg above and 20 deg below a baseline gaze elevation. This manipulation was designed to vary the amount of vergence effort required to fixate the VDT. Results indicate a positive relation between vergence effort and visual fatigue both within and between subjects, and that prolonged near work leads to decreased vergence accuracy at far distances. Implications for VDT workstation design are discussed.

journal_name

Hum Factors

journal_title

Human factors

authors

Tyrrell RA,Leibowitz HW

doi

10.1177/001872089003200307

subject

Has Abstract

pub_date

1990-06-01 00:00:00

pages

341-57

issue

3

eissn

0018-7208

issn

1547-8181

journal_volume

32

pub_type

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