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Wolffsohn, J S, Edgar, Graham K 
ORCID: 0000-0003-4302-7169 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.
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: | Schools and Research Institutes > School of Education and Science |
| Depositing User: | Graham Edgar |
| Date Deposited: | 01 Dec 2015 13:02 |
| Last Modified: | 31 Aug 2023 09:05 |
| URI: | https://eprints.glos.ac.uk/id/eprint/603 |
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