More than a quarter of UK drivers admit to having asked passengers to read road signs for them due to poor vision.

An online survey of 1,025 drivers by insurer esure also found that 8 per cent were not able to read a number plate from 20 metres.

'While the number of motorists banned from driving due to poor eyesight is increasing, it's shocking to see how many motorists have concerns about not having 20/20 vision but are still happy to drive,' said Mike Pickard, head of risk and underwriting at esure.

The poll also showed that 45 per cent of drivers believe their eyesight has deteriorated since they first took their test. It found 42 per cent admitted slowing down and squinting to read road signs, while 27 per cent had asked their passengers for guidance.

Meanwhile, 24 per cent of the motorists polled had driven without their glasses despite being prescribed them - 12 per cent doing so on a regular basis.

The research also showed the average motorist had their eyes tested every three years but that 10 per cent had gone without for the past decade.

The Co-operative Motor Group last week reported that the number of drivers having their licences revoked due to failed vision more than doubled between 2006 and 2010 to reach 4,009.