Older drivers are one of the most at risk groups for eyesight problems (Image: Getty)
Experts have renewed calls for older drivers to have their tested every two years to retain their with new data showing thousands are a threat on UK roads.
It comes after the largest-ever UK roadside vision screening survey across Britain ahead of winter.
Police forces across the country conducted number plate eyesight tests on 3,010 motorists with 1.7% failing completely.
When rounded up, this would equate to around 720,642 motorists
Of motorists stopped by officers, 40% had not despite recommendations.
Older motorists are urged to have their eyesight checked regularly (Image: Getty)
However, older drivers are most at risk with the roadside test failure rate highest amongst the elderly.
According to the data, as many as 10.2% of 81 to 90-year-olds failed the simple assessment suggesting one in 10 in this category are not fit to drive.
Rob Heard, founder of the reiterated calls for motorists to have regular sight checks” to ensure their vision is up to scratch.
He said: “This report highlights that many people are still taking the risk to drive without knowing they have suitable vision for driving and failing to have an eyesight test every two years.
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“People’s sight deteriorates gradually, often without them being aware and often without them realising their sight may have fallen below the legal limit.
“Regular sight tests with an optometrist are an effective way of not only making sure we are safe to drive on the road, but also detecting medical conditions early so they can be treated, potentially extending a person’s driving career.”
One-third of drivers stopped for testing had been prescribed glasses or contact lenses for driving.
But, many were still breaking the rules with half of those who failed the check not wearing their required glasses at the time.
David Cartwright, optometrist and chairman of Eye Health UK stressed that motorists should have checks every 24 months.
He commented: “90 per cent of information needed for driving is visual. Even a minor reduction in vision can slow reaction times and impair your ability to recognise hazards or judge speed. It can also cause fatigue and affect contrast sensitivity – essential for adjusting to glare and driving in low light conditions.
“Having regular eye tests, every two years or sooner if you notice a change in your vision is essential to keep you and other road users safe.”