Citation

Oetjen S, Ziefle M. Hum. Factors 2007; 49(4): 619-627.

Affiliation

Department of Psychology, RWTH Aachen University, Jaegerstr. 17-19, 52056 Aachen, Germany.

Copyright

(Copyright © 2007, Human Factors and Ergonomics Society, Publisher SAGE Publishing)

DOI

unavailable

PMID

17702213

Abstract

OBJECTIVE: The present study examined the visual discrimination speed and accuracy while using an LCD and a CRT display. BACKGROUND: LCDs have ergonomic advantages, but their main disadvantage is that they provide inconsistent photometric measures depending on the viewing angle (anisotropy). METHOD: Independent variables were screen type (LCD and CRT), viewing angle (0 degrees, 11 degrees, 41 degrees, 50 degrees, and 56 degrees) and user's age (teenagers, young adults, and middle-aged adults). Dependent variables were speed and accuracy in a visual discrimination task and user's ratings. RESULTS: The results corroborated the negative impact of LCD anisotropy. Visual discrimination times were by 7.6% slower when an LCD was used instead of a CRT. Performance differences increased with increasing viewing angle for both screens, but performance decrements were larger for the LCD. Young adults showed the best visual performance, as compared with teenagers and middle-aged adults. Effects of anisotropy were found for all age groups, although the performance of middle-aged adults was affected more when extended viewing angles were adopted. CONCLUSION: LCD anisotropy is a limiting factor for visual performance, especially in work settings where fast and accurate reactions are necessary. APPLICATION: The outcomes of this research allow ergonomic guidelines for electronic reading.

Language: en