The number of drivers who have lost their driving licence due to failing eyesight has more than doubled in the last four years.
Those whose licence was revoked totalled 1,597 in 2006 but the figure was as high as 4,009 last year, according to figures obtained by the Co-operative Motor Group following a freedom of information request.
Group managing director Tony Guest said: "Good eyesight is essential to safe motoring, and we would urge anybody who has concerns over their vision to contact a specialist. There is no room for complacency when it comes to road safety."
The Co-operative Motor Group said the law demanded that any driver with concerns over their eyesight should see a doctor or eye specialist and - if they are advised to do so - they must then contact the Driver and Vehicle Licensing Agency to inform it if they have a condition that makes it dangerous to drive.
Failure to do so is punishable by a fine of up to £1,000, and will also invalidate driver insurance.
These were the number of licences revoked: 2006 - 1,597; 2007 - 2,612; 2008 - 2,764; 2009 - 3,014; 2010 - 4,009.