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Document ID (ISN)73642
CIS number 99-1694
ISSN - Serial title 0018-7208 - Human Factors
Year 1998
Convention or series no.
Author(s) Chi C.F., Lin F.T.
Title A comparison of seven visual fatigue assessment techniques in three data-acquisition VDT tasks
Bibliographic information Dec. 1998, Vol.40, No.4, p.577-590. Illus. 15 ref.
Abstract Methods of measuring visual fatigue (accommodation power, visual acuity, pupil diameter, critical fusion frequency (CFF), eye movement velocity, subjective rating of visual fatigue, and task performance) were compared for their sensitivity to visual load. Ten participants performed a monitoring task at two viewing distances, read articles under two levels of screen contrast, and tracked visual targets at two different speeds. The techniques were also compared by extending the task time from 20 to 60min with the same tasks to test for possible improvement in sensitivity. Results indicated that sensitivities of accommodation power, visual acuity, and CFF were greatly improved by a longer task period, but these techniques did not distinguish among tasks. Pupil diameter, eye movement velocity, and subjective rating of visual fatiguewere sensitive in differentiating tracking from reading and monitoring tasks. Eye movement velocity and subjective rating were sensitive to the changes in target velocity of the tracking task. Task performance helped to ensure that participants maintained the same performance level by devoting more resources to the high-load conditions. Topics: comfort assessment; CRT display terminals; data processing equipment; evaluation of technique; visual acuity; visual comfort; visual fatigue; visual flicker fusion; visual performance; visual tasks.
Descriptors (primary) visual tasks; visual fatigue; visual performance; comfort assessment; visual display terminals
Descriptors (secondary) data processing equipment; evaluation of technique; visual flicker fusion; visual comfort; visual acuity
Document type D - Periodical articles
Country / State or ProvinceTaiwan (China)
Subject(s) Lighting, colour and vision
Broad subject area(s) Physiology, ergonomics
Browse category(ies) Fatigue
Office work
Accident research
Visual display terminals (VDTs)