Title: A study of visual fatigue using workload data from alignment errors in stereoscopic display

Authors: Hanniebey D. Wiyor; Celestine A. Ntuen

Addresses: Department of Industrial and Systems Engineering, North Carolina A&T State University, 1601 East Market Street, 406 McNair Hall, Greensboro, NC 27411, USA ' Department of Industrial and Systems Engineering, North Carolina A&T State University, 1601 East Market Street, 406 McNair Hall, Greensboro, NC 27411, USA

Abstract: Visual demands from the use of stereoscopic displays results in occupational visual fatigue in the human visual system. This study focused on identifying the effects of alignment error and workload on visual fatigue. Twenty-four participants performed tasks presented in vertical shift, rotational error, and magnification difference alignment errors using 8 ft. × 6 ft. NEC LT silver screen, NEC LT 245 DLP projector and NEC LT 245 Polaroid glasses. There was statistical significant difference between subjective measures of visual fatigue before air traffic control task (BATC) and after air traffic control task (ATC 3), (p < 0.05). Statistical significance was observed for simulator sickness questionnaire (SSQ) and NASA task load index (NASA-TLX) as workload responses between the alignments errors: SSQ (p ʲ 0.05) and NASA-LTX (p < 0.05). Vertical shift alignment error resulted in the least perceptual ratings of visual fatigue and operator workload.

Keywords: visual fatigue symptoms; alignment errors; simulator sickness questionnaire; SSQ; operator workload; stereoscopic displays; air traffic control tasks; stereoscopic motion images; air traffic controllers; simulation.

DOI: 10.1504/IJHFMS.2014.062391

International Journal of Human Factors Modelling and Simulation, 2014 Vol.4 No.2, pp.145 - 158

Received: 05 Jul 2013
Accepted: 24 Feb 2014
Published online: 05 Jul 2014 *

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