Abstract
The effects of vertical viewing angles and eye blinking rate during computer work were investigated Twenty subjects read from a computer screen set at four levels of viewing angles. Eye blinks during reading tasks were measured by electrooculography. Subjective ratings on visual and musculoskeletal strain were obtained. Test hypotheses were: (a) blink rate does not change with variations of viewing angle, (b) blink rate does not change with time-on-task, and (c) there is no interaction between viewing angle and time-on-task effects. The results indicated that blink rate increases as the viewing angle approaches eye level, and that blink rate increases with time-on-task. No significant interaction was found between viewing angle and time-on-task. Results and subjective ratings support recommendations of VDT viewing angle range near 15° below eye level.
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