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Y. Tang, A.W. Siu, H.H. Chan; Visual Status of Hong Kong Commercial Vehicle Drivers . Invest. Ophthalmol. Vis. Sci. 2006;47(13):3683.
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Driver is legally required to pass a vision test before a driving permit is issued. This study compared the casualty accident rates of different cities/countries and also reported the current vision status of Hong Kong commercial vehicle drivers.
Current casualty accident rates and vision–related requirement for driver’s license were collected from the transport departments of 15 Asia–pacific and western cities/countries. Locally, 420 commercial vehicle operators (mean age: 52.74 years old) completed a set of questionnaires on vision and driving–related environmental issues, of which, 361 drivers also participated in a vision screening program. Their habitual distance and near visual acuities, color vision, stereopsis and horizontal temporal visual field were evaluated.
Hong Kong has a high casualty accident rate. Exclusion of visual field assessment for drivers in certain cities/countries was significantly associated with higher casualty accident rates (p<0.05). The most prevalent symptoms of the commercial drivers were ocular tiredness (51.4%), itching eyes (44.5%) and tearing (28.3%). Around 80% and 60% of drivers reported sunlight and forthcoming headlight as glare sources, respectively. There were 5% and 65% of subjects had distance and near visual acuities worse than 6/18+2, respectively. Around 18.5% had poor stereoacuity and 9.9% had colour vision deficits. Moreover, 1.9% had temporal visual field less than 70º in any one eye.
There is no standardized vision standard adopted by local licensing authorities worldwide. Our findings show that inclusion of visual field test is associated with a lower casualty accident rate. Anterior eye symptoms and glare were common among the commercial vehicle drivers. Ways to improve the visual efficiency of drivers will be discussed.
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