Using diplopia as a warning of an inappropriate visual (ocular) accommodative response (WIVAR)

Wolffsohn, J S and Edgar, Graham K and McBrien, N A (2001) Using diplopia as a warning of an inappropriate visual (ocular) accommodative response (WIVAR). Aviation, Space, and Environmental Medicine, 72 (7). pp. 652-658.

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Abstract

BACKGROUND: Over-accommodation, a tendency to focus at a distance closer than the desired distance, has been previously shown to occur when using a head-up display (HUD). METHODS: A simple system was developed as a warning of an inappropriate visual accommodative response (WIVAR) during flight training. Two lines, which are seen as four low-contrast lines (physiological diplopia) if the user is focused in the distance due to the link between convergence and accommodation, are projected onto the pilot's HUD combiner. RESULTS: The results show that by using the WIVAR system the accommodative response can be kept more distant when viewing forward-looking infra-red imagery (by 0.12 +/- 0.04 D; p < 0.05), performing a high cognitive workload task (by 0.07 +/- 0.03 D; p < 0.05) and especially when viewing in a Ganzfeld (by 0.41 +/- 0.12 D; p < 0.01). CONCLUSION: While collimated HUD imagery stimulates the user to a more distant focus, the use of the WIVAR lines can cause additional relaxation of accommodation.

Item Type: Article
Article Type: Article
Related URLs:
Subjects: B Philosophy. Psychology. Religion > BF Psychology
Divisions: Faculty of Business, Computing and Applied Sciences > School of Natural & Social Sciences > Psychological Sciences
Depositing User: Graham Edgar
Date Deposited: 01 Dec 2015 13:02
Last Modified: 01 Sep 2016 20:23
URI: http://eprints.glos.ac.uk/id/eprint/603

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