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Proceedings Paper

New vision performance indicators of biocular head-mounted display image misalignment
Author(s): Melvyn E. Kalich; Lisa M. Lont; Gina M. Bissette; Heber D. Jones
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Paper Abstract

This is the last in a series of studies designed to establish objective tools that can evaluate vision and cognitive visual performance with head-/helmet-mounted displays (HMDs) in a static environment. These tools will be applied to ongoing studies in an interactive, animated environment that will compare visual performance of biocular and monocular HMDs and evaluate image misalignment tolerance standards during long-term wear (4-6 hours) and during vibration. In this study, saccadic velocity significantly decreased following image misalignment, but not following a corresponding control period without misalignment, showing the measurement to be sensitive to image misalignment in a full-overlap biocular display. Pupil constriction latency significantly increased for both the experimental and control conditions, indicating that, although sensitive to using the optical device, this measurement was not specifically sensitive to a divergent horizontal misalignment of 3.1 milliradians (mrad). These results add saccadic velocity to the tools that we have already established. We also evaluated the visual performance of presbyopic subjects using a full-overlap display and found decreased performance with and without image misalignment. This has implications for helmet-mounted display use by older pilots that certainly warrants further investigation. In previous studies6, 7 individuals with accommodative and vergence problems showed reduced performance when there was a small divergent horizontal image misalignment in a partial-overlap biocular display.

Paper Details

Date Published: 18 May 2006
PDF: 12 pages
Proc. SPIE 6224, Helmet- and Head-Mounted Displays XI: Technologies and Applications, 622408 (18 May 2006); doi: 10.1117/12.665876
Show Author Affiliations
Melvyn E. Kalich, U.S. Army Aeromedical Research Lab. (United States)
Lisa M. Lont, U.S. Army Aeromedical Research Lab. (United States)
Gina M. Bissette, U.S. Army Aeromedical Research Lab. (United States)
Heber D. Jones, U.S. Army Aeromedical Research Lab. (United States)

Published in SPIE Proceedings Vol. 6224:
Helmet- and Head-Mounted Displays XI: Technologies and Applications
Randall W. Brown; Peter L. Marasco; Clarence E. Rash; Colin E. Reese, Editor(s)

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