During the walk to your car your driving instructor will test your eyesight by asking you to read a numberplate of a car in the distance. The requirement is that you are able to read either a new style car number plate (after 1st September 2001) from a distance of no less than 20 meters, or an older style car number plate (before 1st September 2001) from a distance of no less than 20.5 meters.
You are given three attempts to successfully read a number plate. If you cannot read the number plate the first time your examiner will ask you to read a second number plate. If you are unable to read either the first or second number plate your examiner will measure the exact distance and give you a third attempt. If you fail the third attempt then your driving test will be immediately terminated. It is worth noting that the first and second attempt will be from a distance of 20 meters or further. The driving test instructor is attempting to get as close to the 20 meter requirement as possible but edging on the side of caution and potentially asking you to read a number plate further than 20 meters away.
You are allowed to wear contact lenses or glasses but you must also ensure that you wear these during your driving test.
If you have difficulties with spoken English you are allowed to write the number plate down.