DVLA eyesight rules for driving in the UK

UK drivers have a legal duty to meet the DVLA's minimum eyesight standards every time they get behind the wheel. This guide explains what those standards are, how they are tested, and what your options are if you no longer meet them.

The number-plate test

The foundation rule is simple: you must be able to read, in good daylight, a UK-style number plate from 20 metres away, wearing your glasses or contact lenses if you normally do. That distance is roughly five car lengths.

If you fail this test, you must stop driving and inform the DVLA. Police officers can require you to read a plate at the roadside and you can be prosecuted for driving with defective eyesight.

Visual acuity requirement

In addition to the number-plate rule, drivers must have a visual acuity (measured on a Snellen chart) of at least 6/12 with both eyes open, using glasses or contacts if needed. 6/12 corresponds to a decimal acuity of 0.5 or a LogMAR of 0.3.

Visual field requirement

The DVLA requires an adequate field of vision:

- A horizontal field of at least 120 degrees

- Extension of at least 50 degrees left and right

- At least 20 degrees above and below the horizontal

- No significant defect in the central 20 degrees, particularly with both eyes open

If your consultant or optometrist suspects a field defect (from glaucoma, stroke, retinal disease or diabetic retinopathy), formal binocular Esterman visual field testing is required.

Group 2 (lorries and buses) rules

The Group 2 standard for HGV, PCV and bus drivers is stricter. Drivers must have visual acuity of at least 6/7.5 in the better eye and 6/60 in the worse eye, and a full binocular field of at least 160 degrees with no significant defect in the central 70 degrees. Monocular vision disqualifies Group 2 licensing.

What must be reported to the DVLA?

You must tell the DVLA if you have any eye condition that affects both eyes, or the remaining eye if you only have one, and specifically if you have:

- Glaucoma

- Diabetic retinopathy or advanced diabetic eye disease

- Bilateral cataracts affecting vision (see what is a cataract)

- Retinal detachment or macular disease

- Blepharospasm, nystagmus or double vision

- Any monocular vision (loss of sight in one eye)

Failing to declare is a criminal offence carrying a fine of up to £1,000.

Cataracts and driving

Early cataract does not usually stop you meeting the standard, but as it progresses many patients notice glare from headlights at night, difficulty reading road signs at distance and colour dulling. Once acuity drops below 6/12 with glasses on, you cannot drive legally until it is corrected. In practice this is when I usually recommend cataract surgery — most patients return to driving within a few days of surgery.

Laser eye surgery, lens replacement and driving

Refractive procedures — LASIK, PRK and SMILE or lens replacement surgery — routinely bring patients well past the DVLA standard without needing glasses. You must not drive until your surgeon confirms you meet the standard, typically 24 hours after LASIK and 1–2 weeks after lens replacement.

What to do if you fail the standard

1. Stop driving.

2. Book an urgent optometry test to check your prescription and eye health.

3. Inform the DVLA (form V1) if the cause is a notifiable eye condition.

4. If cataract, refractive error or a treatable condition is responsible, arrange treatment. In the private sector this can usually be done within 2–4 weeks.

5. Once your consultant confirms you meet the standard, you may resume driving.

Next steps

If your driving vision has deteriorated and you would like a fast-track private assessment, you can book a consultation at my London practice or call 020 3137 3237. We routinely see patients whose vision has just fallen below the DVLA standard and get them treated within a few weeks.