HGV drivers in the UK must meet strict eyesight standards set by the DVLA under the Group 2 medical framework. These visual standards are significantly more demanding than those required for a standard car (Group 1) licence, reflecting the greater risk posed by large commercial vehicles on public roads. Failing to meet the standards — or failing to declare a relevant eye condition — can result in licence revocation, prosecution, and invalidated insurance. This comprehensive guide explains exactly what eyesight standards apply to HGV drivers in 2026, how they are tested, which conditions are most commonly flagged, and what your options are if your vision falls short.
Why Are HGV Eyesight Standards Higher Than for Car Drivers?
A fully laden articulated lorry can weigh up to 44 tonnes and take more than 90 metres to stop from 60 mph. The consequences of a driver failing to see a hazard in time are far more severe than for a car driver. The DVLA's Group 2 standards reflect this by requiring sharper central vision, a wider visual field, and the absence of certain progressive conditions that might deteriorate unpredictably. The standards are set out in the DVLA's Assessing Fitness to Drive guidance, which is updated regularly and is the definitive reference for medical professionals conducting D4 examinations.
Visual Acuity Standards: Group 1 vs Group 2
Visual acuity measures the sharpness of your central vision, typically expressed as a fraction (e.g., 6/7.5) where the first number is the distance at which you read a chart and the second is the distance at which a person with normal vision would read the same line. The higher the second number, the worse the vision.
| Measurement | Group 1 (Car Licence) | Group 2 (HGV/PCV Licence) |
|---|---|---|
| Better eye (with correction if needed) | 6/12 (0.5 decimal) | 6/7.5 (0.8 decimal) |
| Worse eye (with correction if needed) | 6/60 (0.1 decimal) | 6/60 (0.1 decimal) |
| Binocular visual acuity | Not specified | 6/9 (0.67 decimal) or better |
| Number plate reading distance | 20 metres | 20 metres |
| Maximum lens prescription | Not specified | +8 dioptres (sphere) |
If you wear glasses or contact lenses, you must wear them while driving, and your licence will be coded accordingly (restriction code 01 for glasses, 02 for contact lenses). You must also carry a spare pair of glasses in the cab if you rely on them for driving.
Visual Field Standards
The visual field is the total area you can see without moving your eyes. HGV drivers must meet all of the following binocular visual field requirements:
- A minimum horizontal extent of 160 degrees
- At least 70 degrees to the left and right of centre
- At least 30 degrees above and below the horizontal midline
- No significant defect in the binocular visual field within the central 30 degrees
- No hemianopia (loss of half the visual field) or quadrantanopia (loss of a quarter)
These requirements mean that drivers with significant peripheral vision loss — for example due to glaucoma, retinitis pigmentosa, or a stroke affecting the visual cortex — may not meet the Group 2 standard even if their central acuity is excellent. The visual field assessment is typically conducted using a Goldmann perimeter or Humphrey field analyser at a specialist ophthalmology clinic.
Monocular Vision
Drivers with functional vision in only one eye (monocular vision) generally cannot hold a Group 2 HGV licence. This is because binocular vision is required to meet the visual field standards — a single eye cannot provide the 160-degree horizontal field required. In very rare cases, the DVLA may grant a licence to a monocular driver if they can demonstrate exceptional visual field performance in the remaining eye, but this is uncommon and requires detailed specialist assessment.
If you lose vision in one eye after already holding an HGV licence, you must notify the DVLA immediately and stop driving commercially until the DVLA has assessed your case.
Colour Vision
Colour blindness (colour vision deficiency) does not automatically disqualify you from holding an HGV licence. The DVLA does not set a specific colour vision standard for Group 2 licences, provided your visual acuity and visual field meet the required standards. However, if your colour vision deficiency is so severe that it affects your ability to distinguish traffic signals or hazard warning signs, the DVLA may impose restrictions or refuse a licence.
Common Eye Conditions and Their Impact on HGV Licensing
| Condition | Impact on HGV Licence | DVLA Action |
|---|---|---|
| Glaucoma | May fail visual field test | Specialist report required; short-period licence possible |
| Cataracts | Reduces acuity; correctable by surgery | Must meet standards post-surgery; 4-week wait after cataract surgery |
| Macular degeneration | Reduces central acuity | Must meet acuity standards; specialist report may be required |
| Diabetic retinopathy | May affect acuity and visual field | Annual specialist review; may result in short-period licence |
| Retinal detachment | May affect visual field | Must not drive until treated and vision stabilised |
| Diplopia (double vision) | Disqualifying if persistent | Must stop driving; may return if controlled and stable for 6 months |
Progressive Eye Conditions and the Duty to Notify the DVLA
If you develop a progressive eye condition — or if an existing condition worsens — you have a legal duty to notify the DVLA. This applies even if you believe your vision still meets the required standards. The DVLA will assess your case individually, typically by requesting a report from your ophthalmologist. You may be granted a short-period licence (1 or 3 years rather than the standard 5 years) with a requirement for regular specialist reviews.
Failing to notify the DVLA of a relevant medical condition is a criminal offence under the Road Traffic Act 1988, carrying a fine of up to £1,000. More importantly, if you are involved in an accident while driving with an undeclared condition, your insurance may be invalidated, leaving you personally liable for any damages.
Laser Eye Surgery and HGV Licensing
Laser eye surgery (LASIK, LASEK, PRK) can improve your vision to meet the Group 2 standard if your uncorrected vision currently falls short. However, the DVLA requires you to wait until your vision has fully stabilised after surgery before applying for or renewing your HGV licence. The standard waiting period is:
- LASIK and LASEK: At least 3 months after surgery, with stable refraction confirmed by your ophthalmologist
- PRK: At least 3 months after surgery
- Cataract surgery: At least 4 weeks after surgery
After the waiting period, you must attend a D4 medical examination to confirm that your vision meets the Group 2 standards. Your examining doctor will assess your acuity and visual field and may request a report from your ophthalmologist confirming that your vision is stable.
How Is Eyesight Tested at the D4 Medical?
Your eyesight is assessed as part of the D4 medical examination. The examining doctor will conduct the following assessments:
- Number plate test: Reading a standard number plate at 20 metres, with glasses or contact lenses if worn
- Snellen chart: Testing visual acuity in each eye separately and both eyes together
- Visual field assessment: A basic confrontation test in the consulting room; if concerns arise, referral to an ophthalmologist for a formal perimetry test
- Ocular history review: Discussion of any eye conditions, operations, or symptoms
If the doctor has any concerns about your visual field, they will refer you to an ophthalmologist for a formal visual field test using a perimeter. The cost of this specialist assessment is typically £100–£250 and is not covered by the NHS for DVLA purposes. See our guide on D4 medical costs for a full breakdown of examination fees.
What Happens If You Fail the Eyesight Test?
If you fail the eyesight assessment at your D4 medical, the examining doctor will not complete the D4 form in your favour. You will not be able to apply for or renew your HGV licence until your vision meets the required standards. Your options depend on the reason for failure:
- Correctable acuity: If your acuity can be corrected with glasses or contact lenses, get a new prescription and re-attend the D4 examination
- Visual field defect: Seek specialist ophthalmology assessment to determine whether the defect is stable and whether any treatment is available
- Progressive condition: Notify the DVLA and follow their guidance; you may be able to drive on a short-period licence with regular reviews
- Monocular vision: Seek specialist advice; in rare cases, a licence may be granted following detailed assessment
Eyesight Standards at Different Ages
HGV licence renewal intervals are linked to age, and eyesight is assessed at each renewal. The renewal schedule is as follows:
| Age | Licence Renewal Interval | D4 Medical Required? |
|---|---|---|
| Under 45 | 5 years | Yes, at each renewal |
| 45–65 | 5 years | Yes, at each renewal |
| 65–70 | 1 year | Yes, annually |
| Over 70 | 1 year | Yes, annually |
As you age, the risk of developing eye conditions such as cataracts, glaucoma, and macular degeneration increases. Regular eye examinations with an optometrist — at least every two years — are strongly recommended for all HGV drivers, regardless of their renewal schedule. Early detection of conditions such as glaucoma can allow treatment to preserve vision before it deteriorates to the point of disqualification. See our full guide on HGV licence renewal for more information on the renewal process.
Practical Tips for Maintaining Good Vision
Maintaining good vision is not just about passing the D4 medical — it is about staying safe on the road. HGV drivers should attend regular optometrist appointments, wear prescribed glasses or contact lenses at all times when driving, keep a spare pair of glasses in the cab, report any sudden changes in vision to a doctor immediately, and avoid driving if experiencing visual disturbances such as flashing lights or sudden blurring. Conditions such as diabetes and sleep apnoea can both affect vision and are common in the HGV driver population — managing these conditions proactively protects both your licence and your health.
Start Your HGV Training with GS Driver Training
GS Driver Training has helped thousands of drivers qualify since 1996. We offer Class 1 (C+E), Class 2 (C), C1, ADR, and CPC training from our facility in Surrey. Our team can advise on the D4 medical process and connect you with approved medical examiners. View our courses or call 01252 447808.
