The Association of Optometrists has said that Drivers should have compulsory eye tests every 10 years.

One in three optometrists say they have seen patients in the last month who continue to drive with vision below the legal standard.

Motorists must read a number plate from 20m (65ft) in the practical driving test, but there is no follow-up check.

It is currently down to drivers to report changes to eyesight to the DVLA. However this is not always as simple as it sounds and this is down to the fact that sight changes can be gradual, often people won't realise that their vision has deteriorated over time.

Data from the Department for Transport shows seven people were killed and 63 were seriously injured in accidents on Britain's roads last year when "uncorrected, defective eyesight" was a contributory factor.

Currently when drivers pass the age of 70, the emphasis changes a little. Drivers must actively make a declaration every three years that they are fit to drive. As part of that they must confirm that they meet the minimum eyesight requirement.