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  • Title: The driving visual field and a history of motor vehicle collision involvement in older drivers: a population-based examination.
    Author: Huisingh C, McGwin G, Wood J, Owsley C.
    Journal: Invest Ophthalmol Vis Sci; 2014 Nov 13; 56(1):132-8. PubMed ID: 25395488.
    Abstract:
    PURPOSE: We designed a visual field test focused on the field utilized while driving to examine associations between field impairment and motor vehicle collision involvement in 2000 drivers aged 70 years or older. METHODS: The "driving visual field test" involved measuring light sensitivity for 20 targets in each eye, extending 15° superiorly, 30° inferiorly, 60° temporally, and 30° nasally. The target locations were selected on the basis that they fell within the field region utilized when viewing through the windshield of a vehicle or viewing the dashboard while driving. Monocular fields were combined into a binocular field based on the more sensitive point from each eye. Severe impairment in the overall field or a region was defined as average sensitivity in the lowest quartile of sensitivity. At-fault collision involvement for 5 years prior to enrollment was obtained from state records. Poisson regression was used to calculate crude and adjusted rate ratios (RRs) examining the association between field impairment and at-fault collision involvement. RESULTS: Drivers with severe binocular field impairment in the overall driving visual field had a 40% increased rate of at-fault collision involvement (RR, 1.40; 95% confidence interval [CI]: 1.07-1.83). Impairment in the lower and left fields was associated with elevated collision rates (RR, 1.40; 95% CI: 1.07-1.82 and RR, 1.49; 95% CI: 1.15-1.92, respectively), whereas impairment in the upper and right field regions was not. CONCLUSIONS: Results suggest that older drivers with severe impairment in the lower or left region of the driving visual field are more likely to have a history of at-fault collision involvement.
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