Head and eye movements and lane keeping in drivers with hemianopia and quadrantanopia compared to controls

Wood, Joanne M., Elgin, Jennifer, McGwin, Gerald Jr., Vaphiades, Michael S., Kline, Lanning B., & Owsley, Cynthia (2009) Head and eye movements and lane keeping in drivers with hemianopia and quadrantanopia compared to controls. In Investigative Ophthalmology & Visual Science (IOVS), Association for Research in Vision and Ophthalmology, Broward County Convention Center, Fort Lauderdale, Florida.

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Purpose: To compare the eye and head movements and lane-keeping of drivers with hemianopia and quadrantanopia with that of age-matched controls when driving under real world conditions. Methods: Participants included 22 hemianopes and 8 quadrantanopes (M age 53 yrs) and 30 persons with normal visual fields (M age 52 yrs) who were ≥ 6 months from the brain injury date and either a current driver or aiming to resume driving. All participants drove an instrumented dual-brake vehicle along a 14-mile route in traffic that included non-interstate city driving and interstate driving. Driving performance was scored using a standardised assessment system by two “backseat” raters and the Vigil Vanguard system which provides objective measures of speed, braking and acceleration, cornering, and video-based footage from which eye and head movements and lane-keeping can be derived. Results: As compared to drivers with normal visual fields, drivers with hemianopia or quadrantanopia on average were significantly more likely to drive slower, to exhibit less excessive cornering forces or acceleration, and to execute more shoulder movements off the seat. Those hemianopic and quadrantanopic drivers rated as safe to drive by the backseat evaluator made significantly more excursive eye movements, exhibited more stable lane positioning, less sudden braking events and drove at higher speeds than those rated as unsafe, while there was no difference between safe and unsafe drivers in head movements. Conclusions: Persons with hemianopic and quadrantanopic field defects rated as safe to drive have different driving characteristics compared to those rated as unsafe when assessed using objective measures of driving performance.

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ID Code: 31537
Item Type: Conference Paper
Refereed: Yes
Additional Information: Articles free to read on journal website after 6 months
Additional URLs:
Keywords: Visual Fields, Aging, Visual Performance, Neuro-ophhtalmology, Cortial Function/rehabilitation
ISSN: 0146-0404
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Current > Schools > School of Optometry & Vision Science
Deposited On: 29 Mar 2010 22:13
Last Modified: 02 Feb 2015 06:19

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