Drivers who need to correct their vision have been urged to keep a spare set of contact lenses or glasses in their cars.
The advice was given by German news agency Deutsche Presse Agentur.
It cited figures from the German Association of Ophthalmologists, which believed that 11 per cent of drivers aged 50 to 59 and 20 per cent of 60 or over should not drive at night because they cannot see well enough.
As well as keeping contact lenses or glasses in the car as spares, drivers were also advised to have eye tests regularly, especially after the age of 40.
Sunglasses should also not be so dark that they make it harder to see properly.
The Retail Motor Industry Federation recently warned people to keep windscreens clean in order to maintain good vision on the road.
Mirrors and wiper blades also need to be maintained and washer bottles ought to be checked on a regular basis.
by Emily Tait