Effects of Vertical Viewing Angle on Eye Blink Rate during Computer Work
Sol Solorzano, Paul Bommarito, Stephen R. Burastero · Proceedings of the Human Factors and Ergonomics Society Annual Meeting · 2000
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.