Older Drivers at High Crash Risk Are 'More Distractible,' Reports Optometry and Vision Science

Released: 2-Apr-2012 11:00 AM EDT
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Citations Optometry and Vision Science

Drivers with Limited 'Useful Field of View' Should Avoid In-Car Distractions

Newswise — Philadelphia, Pa. (April 2, 2012) – Older drivers rated at high crash risk on a computerized vision test are more likely to have driving problems related to distractions in the car, reports a study in the April issue of Optometry and Vision Science, official journal of the American Academy of Optometry. The journal is published by Lippincott Williams & Wilkins, a part of Wolters Kluwer Health.

Older drivers who show limitations on the "Useful Field of View" (UFOV) test make more driving errors when distracted, suggests the new research, led by Joanne M. Wood, PhD, FAAO, of Queensland University of Technology, Brisbane, Australia. "This finding provides a basis for predicting those older adults who will be more distractible on the road, and therefore also those who might benefit most from minimizing distraction while driving," the researchers write.

UFOV Predicts Driving Problems Related to Distraction
The study included 92 drivers, average age 74 years, who underwent the computerized UFOV test. Useful field of view is defined as "the area over which a person can extract information in a single glance without moving his or her head or eye." Drivers with limitations in UFOV are more likely to have problems in demanding driving situations, with an increased risk of crashes.

After the UFOV test, the drivers performed a closed-course driving test three times. On two occasions, they did the driving test with in-car visual or auditory distracters, consisting of simple math problems presented on a video screen or audio speaker.

Drivers who had limitations in UFOV were most likely to have problems on the driving test related to both visual and auditory distracters. They also took longer to complete the driving test—possibly reflecting slower driving speeds, which are common among older drivers.

In particular, drivers who scored lower on the "selective attention" subtest of the UFOV had decreased performance on the driving test in the presence of distracters. Drivers with lower scores for selective attention were also more likely to be rated at high crash risk on the UFOV. "This finding suggests that the driving problems elicited in the presence of visual or auditory distracters are greatest for those who are rated at most risk for crashing overall," the researchers write.

In contrast, older drivers who did better on the selective attention subtest had better overall performance on the driving test, even with distracters. The selective attention subtest was a better predictor of performance on the driving test than the other two UFOV subtests (visual processing speed and selective attention).

Older Drivers at Risk Should Minimize Distractions
Previous research has shown that the UFOV test is highly effective in predicting crash risk among older adults, with or without vision problems. The new study suggests that distractibility is an important contributor to problems in driving performance and to crash risk predicted by the UFOV test. That's consistent with recent research on the effects of increased distraction while driving—especially for auditory distractions and cell phone use in cars.

"Our results have important implications for the design of in-vehicle devices, such as satellite navigation devices and mobile phones (even when hands free)," Dr Wood and coauthors write. "The effects of distracters are likely to be exacerbated as the driving environment becomes increasingly complex." They believe that older drivers with "more extensive constriction" of their UFOV should be warned of their possible increased risk of driving errors—and perhaps especially to minimize distractions while driving.

"The result is consistent with the observation that many have made that as you age you find in-vehicle distractions (like a radio or noisy conversation) to be more annoying," comments Anthony Adams, OD, PhD, Editor-in-Chief of Optometry and Vision Science. He adds, "It certainly raises even more questions about the wisdom of in-vehicle screen displays and cell phone use!"
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About Optometry and Vision Science
Optometry and Vision Science, official journal of the American Academy of Optometry, is the most authoritative source for current developments in optometry, physiological optics, and vision science. This frequently cited monthly scientific journal has served primary eye care practitioners for more than 75 years, promoting vital interdisciplinary exchange among optometrists and vision scientists worldwide.

About the American Academy of Optometry
Founded in 1922, the American Academy of Optometry is committed to promoting the art and science of vision care through lifelong learning. All members of the Academy are dedicated to the highest standards of optometric practice through clinical care, education or research.

About Lippincott Williams & Wilkins
Lippincott Williams & Wilkins (LWW) is a leading international publisher of trusted content delivered in innovative ways to practitioners, professionals and students to learn new skills, stay current on their practice, and make important decisions to improve patient care and clinical outcomes.

LWW is part of Wolters Kluwer Health, a leading global provider of information, business intelligence and point-of-care solutions for the healthcare industry. Wolters Kluwer Health is part of Wolters Kluwer, a market-leading global information services company with 2011 annual revenues of €3.4 billion ($4.7 billion).


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