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Drivers' visual acuity

BMJ 2000; 321 doi: (Published 21 October 2000) Cite this as: BMJ 2000;321:1028
  1. Douglas Carnall (
  1. BMJ

    Adequate vision is plainly a prerequisite for driving a motor vehicle, but this week a paper in the BMJ shows that measuring adequacy is far from straightforward. Snellen charts are used to assess visual acuity in the clinic, but the actual standard required—reading a car licence plate at 20.5 metres—does not correlate perfectly with acuity …

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