The Eyesight Test on Your Driving Test in 2026: The 20-Metre Rule and What Happens If You Fail

Every UK practical driving test starts the same way, and it is not with the car. Before you so much as open the door, the examiner will point at a parked vehicle and ask you to read its number plate. Get it wrong, and your test is over before it began — you fail, you lose the fee, and in some cases your licence is at risk.

It sounds trivial. It is not. The DVSA records hundreds of eyesight failures every year, and almost all of them are avoidable. Here is exactly how the eyesight check works in 2026, the distances involved, and what happens if you cannot do it.

What the Eyesight Test Actually Involves

The examiner will ask you to read the registration number of a vehicle parked nearby. That is the whole test. You do it standing up, outside the car, before your vehicle safety questions and before you drive.

If you cannot read the plate, the examiner will measure the distance precisely and try again with another vehicle. If you still cannot manage it, the test is terminated.

What Happens If You Fail the Eyesight Check

Three things happen, and they are more serious than most learners realise.

1. Your test is recorded as a fail. It counts as an attempt and you lose the fee. There is no refund.
2. The DVSA informs DVLA. Your provisional entitlement can be revoked while your vision is investigated.
3. You may need an eye test and medical evidence. Before your licence is reinstated you will normally need to satisfy DVLA that you meet the standard, which can mean an optician’s report and, in some cases, a DVLA-arranged eyesight test.

The whole process can take weeks. Compare that with the twenty minutes it takes to book a free or low-cost sight test beforehand.

The Rules on Glasses and Contact Lenses

You are entirely free to wear glasses or contact lenses for the eyesight check — and for the test itself. There is no penalty and no disadvantage.

But there is a condition attached: if you need corrective lenses to meet the standard, you must wear them whenever you drive, for the rest of your driving life or until your prescription changes. Driving without them once you are licensed is an offence, and your insurance may not cover you.

A practical tip: if you wear glasses only occasionally, bring them to your test and wear them. Do not gamble on managing without.

How to Practise the 20-Metre Check Before Test Day

1. Measure 20 metres properly. Use a tape measure or a phone app once so you know what the distance genuinely looks like. Most people underestimate it.
2. Use five car lengths as a rule of thumb. An average car is about four metres long, so five parked cars end to end is close to 20 metres.
3. Practise in different light. Bright glare and dull, overcast conditions are both harder than a clear afternoon. Test yourself in each.
4. Try it with and without your glasses. If there is any difference at all, wear them on the day.
5. Do not squint your way through it. If you are straining, you are borderline — and borderline on a nervous test morning becomes a fail.
6. Book a sight test. Free NHS sight tests are available to under-16s, 16–18s in full-time education, over-60s and various other groups. Otherwise they are inexpensive.
7. Get checked if anything has changed. Headaches, tired eyes or difficulty with road signs at night are all worth investigating before you book.

Other Vision Rules You Need to Meet

The number plate check is a quick screen, not the whole legal standard. To drive a car in the UK you must also:

• have a visual acuity of at least 6/12 on the Snellen scale, using both eyes together (or one eye if you only have sight in one);
• have an adequate field of vision — your optician can assess this;
• tell DVLA about any notifiable eye condition, including glaucoma, diabetic retinopathy, cataracts affecting your vision and loss of sight in one eye.

Failing to declare a notifiable condition can lead to a substantial fine, and you can be prosecuted if you are involved in a collision as a result.

Common Myths About the Eyesight Test

“The examiner will pick a plate that is miles away.” No. The distance is set and measured if there is any doubt.

“Wearing glasses makes the examiner mark you harder.” Completely untrue. Examiners have no interest in whether you wear glasses.

“You get three goes.” You may be offered a second vehicle if the first plate is genuinely unreadable — dirty, damaged or obscured. That is a courtesy, not an entitlement to guess repeatedly.

“It only applies to the practical test.” The legal standard applies every time you drive, for as long as you hold a licence.

How the Exam Routes App Fits In

The eyesight check is the one part of your test you can guarantee to pass with a bit of preparation. Everything after it — the drive itself — is where the real work happens. The Exam Routes App gives you the real test routes used around your local test centre with turn-by-turn navigation, so you can practise the exact roads before the day and walk into your test knowing what is coming.

Frequently Asked Questions