Group 1 drivers must be able to read a number plate in good daylight at a distance of 20m and have binocular acuity of 6/12. They must also meet certain visual field requirements. There are additional requirements for Group 2 drivers.

You should refer to the Driver & Vehicle Licensing Agency (DVLA) in England, Scotland and Wales or the Driver & Vehicle Agency (DVA) (Northern Ireland for information on visual standards required for driving various classes of vehicle..^{96, 97, 98}

When advising drivers on the most suitable form of lens for their needs, you should consider the transmission of any tinted lens and whether it is suitable for night driving. An anti-reflection coating will improve the transmission of the lens.