Department of Emergency Medicine, University of California, Irvine School of Medicine, Orange, California, USA.
Traffic Inj Prev. 2010 Oct;11(5):503-7. doi: 10.1080/15389588.2010.488494.
In this observational study, a modified version of the Visual Function Index (VF-14) and the Snellen Visual Acuity Test were compared in how well they correlated with self-restricted driving habits in older adults. The VF-14 was originally designed to assess vision in cataract patients; however, in this study, a modified version (mVF-14) was evaluated as a tool for predicting self-restricted driving in older drivers.
During a 3-month period, 151 drivers over the age of 65 were screened at the local senior center. In addition to the Snellen Visual Acuity Test and mVF-14, each participant was given a questionnaire about their driving habits, previously used in self-restriction studies.
Out of 151 total participants, 134 were included and 7 nondrivers and 10 subjects who did not complete all questionnaires were excluded. One hundred one participants exhibited normal visual acuity of 20/40 or better (75%), and 110 scored over 90 on the mVF-14 (82%). Spearman's rank sum correlation coefficient was used to analyze the data and showed significant negative correlation of the mVF-14 and Snellen with self-restricted driving. Individuals with normal vision (20/40 or better on the Snellen eye test) had both high and low mVF-14 scores.
The study shows that poor vision, as indicated by the Snellen scale and low mVF-14 scores, correlates to self-imposed driving limitations. The mVF-14 showed further distinctions of self-restriction between individuals in the same Snellen Visual Acuity category. Therefore, using the mVF-14 in addition to the Snellen Visual Acuity Test can be helpful to further differentiate visual ability within older drivers who appear to have normal vision.
在这项观察性研究中，比较了经过改良的视觉功能指数（VF-14）和 Snellen 视力表，以了解它们在多大程度上与老年人的自我限制驾驶习惯相关。VF-14 最初是为评估白内障患者的视力而设计的；然而，在这项研究中，评估了改良版（mVF-14）作为预测老年驾驶员自我限制驾驶的工具。
在 3 个月的时间里，在当地的老年人中心对 151 名年龄在 65 岁以上的驾驶员进行了筛查。除了 Snellen 视力表和 mVF-14 外，每位参与者还填写了一份关于其驾驶习惯的问卷，该问卷之前用于自我限制研究。
在 151 名参与者中，有 134 名被纳入研究，7 名非驾驶员和 10 名未完成所有问卷的参与者被排除在外。101 名参与者的视力正常，视力为 20/40 或更好（75%），110 名参与者的 mVF-14 得分超过 90（82%）。使用 Spearman 秩和相关系数分析数据，结果显示 mVF-14 和 Snellen 与自我限制驾驶呈显著负相关。视力正常的个体（Snellen 视力测试为 20/40 或更好）的 mVF-14 得分也有高有低。
研究表明，视力差（如 Snellen 量表和低 mVF-14 得分所示）与自我施加的驾驶限制相关。mVF-14 在 Snellen 视力相同的个体之间进一步区分了自我限制。因此，除了 Snellen 视力测试外，使用 mVF-14 可以帮助进一步区分视力正常的老年驾驶员的视力能力。
