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2017-04-09 发布于江苏
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Useful Visual Field Reduction as a Function of Age and Risk of Accident in Simulated Car Dr.pdf

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Useful Visual Field Reduction as a Function of Age and Risk of Accident in Simulated Car Dr

Useful Visual Field Reduction as a Function of Age and Risk of Accident in Simulated Car Driving Joceline Roge?, Thierry Pe?bayle, Aure?lie Campagne, and Alain Muzet PURPOSE. To study the relationships between the reduction of the useful visual field, age, and driving performance. METHODS. Forty-eight subjects, aged from 23 to 77 years per- formed a test to evaluate the size of their useful visual fields. The test involved the detection and localization of peripheral signals that could appear in an area of 70° of visual angle. The subjects then performed a simulated car-driving task involving the management of a situation that could lead to an accident. RESULTS. The analysis of the data revealed that the ability to process peripheral signals and simulated driving performance (vehicle speed) deteriorate with age. Simulated driving perfor- mance and useful visual field measurement have been analyzed jointly. The results indicate that the reduction of the useful visual field, estimated using a target-localization task, is related to the individual’s ability to manage the simulated driving situation (correlation coefficient with speed 0.43 and with reaction time for avoidance of a mobile obstacle 0.30) and the deterioration of the useful visual field estimated using a target detection task is related only to vehicle speed (correla- tion coefficient 0.32). CONCLUSIONS. The adoption of a lower speed by the drivers with a reduced visual field (the elderly ones) is probably an adapta- tion strategy to process the peripheral information. All useful visual field measurements do not seem to be equivalent to estimate the ability to process information relative to the mo- bile obstacle. The risk of collision should be estimated only with a useful visual field test using a target localization task. (Invest Ophthalmol Vis Sci. 2005;46:1774–1779) DOI: 10.1167/iovs.04-0540 The spatial area of the useful visual field can be measured byasking the subject to stare at a central