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Examing factors elevating the risk of motor vehicle accidents in a driving assessment clinic Takuya Hiraga 1 , Shiho Kunimatsu-sanuki 1 , Yuka Fukano 1 , Emina Iwasaka 1 , Yuri Kuroda 1 , Junpei Kuwana 2 , Makoto Itoh 2 , Hiroki Tanaka 1 , Kenji Inoue 3 1Nishikasai Inouye Eye Hospital 2Information and Systems, University of Tsukuba 3Inouye Eye Hospital pp.1296-1302
Published Date 2023/10/15
DOI https://doi.org/10.11477/mf.1410214935
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Abstract Purpose:To assess motor vehicle collision(MVC)risk in drivers with visual field impairment using a driving simulator(DS).

Methods:One hundred and twenty-one patients(mean age 63.0±13.3 years)at our driving assessment clinic underwent DS(Honda Motor Co., Tokyo)testing with eye tracking(Tobii Pro X3-120, Tobii Pro nano). All patients were examined with the Humphrey Field Analyzer 24-2 SITA-Standard program(HFA 24-2). Cognitive impairment was assessed using the mini mental state examination(MMSE). The binocular integrated visual field(IVF)was calculated by merging the two results from the monocular HFA 24-2 test. The patients' best point-by-point monocular sensitivity was considered. Horizontal and vertical spread of search was calculated based on the standard deviations of the x and y coordinates of the eye movement during a 5-min session of running.

Results:The average number of collisions per person was 1.8±1.9. The average number of collisions was associated with age(r=0.52, p<0.0001), MMSE score(r=−0.22, p=0.025), better-eye mean deviation(r=−0.28, p=0.0024), worse-eye mean deviation(r=−0.28, p=0.021), EVFT score(r=−0.29, p=0.0015), superior IVF(r=−0.29, p=0.0012), and inferior IVF(r=−0.33, p=0.0003). In addition, positive correlations were observed between the average number of collisions and horizontal spread of search(r=−0.43, p<0.0001).

Conclusions:Our results indicate that an increased age, cognitive impairment, and visual field impairment affect risk of MVC risk. Moreover, drivers with visual field impairment should develop a broader horizontal spread of visual search to avoid MVC.


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電子版ISSN 1882-1308 印刷版ISSN 0370-5579 医学書院

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