HGV Driver Eye Test Requirements UK 2026
Vision is the most critical sensory faculty for safe driving, and the DVLA applies significantly stricter eyesight standards to HGV drivers than to car drivers. These standards — known as Group 2 visual standards — are set out in the DVLA's medical standards for fitness to drive and are assessed as part of the D4 medical examination that all HGV drivers must pass before obtaining or renewing their licence.
This guide explains exactly what the Group 2 eyesight standards require, how they are tested, what conditions can affect your ability to meet them, and what happens if you fail.
Group 2 Visual Standards: What You Must Meet
| Requirement | Group 2 Standard (HGV/PCV) | Group 1 Standard (Car) |
|---|---|---|
| Visual acuity (better eye) | At least 6/7.5 (Snellen) | At least 6/12 |
| Visual acuity (other eye) | At least 6/60 | At least 6/60 |
| Binocular visual acuity | At least 6/9 | Not specified |
| Visual field (horizontal) | At least 160° continuous, with at least 70° left and right | At least 120° continuous |
| Visual field (vertical) | At least 20° above and below fixation | Not specified |
| No significant defect in binocular field | Within central 30° | Within central 20° |
These standards must be met with corrective lenses if worn. Drivers who wear glasses or contact lenses to meet the standard must always wear them when driving and must carry a spare pair in the vehicle. The visual acuity standard of 6/7.5 in the better eye is equivalent to being able to read a number plate at 20 metres — the same distance used in the practical driving test number plate check, but to a higher standard of clarity.
How the Eye Test Is Conducted
The D4 medical examination includes a visual assessment conducted by the examining doctor. This typically involves reading a Snellen chart (the standard letter chart used in optician practices) at a set distance, and a confrontation visual field test where the doctor assesses your peripheral vision by moving a finger or object from outside your field of view towards the centre.
The D4 medical is not a comprehensive ophthalmic examination — it is a screening test. If the examining doctor has concerns about your vision, they will refer you to an optometrist or ophthalmologist for a more detailed assessment before completing the D4 form. The DVLA may also request a specialist report from an ophthalmologist if there are specific concerns about your visual field or a known eye condition.
Common Eye Conditions That Affect HGV Drivers
| Condition | Effect on Driving Licence | DVLA Notification Required? |
|---|---|---|
| Myopia (short-sightedness) | Correctable with glasses/contacts; no bar if standard met with correction | No (if corrected to standard) |
| Glaucoma | Can affect visual field; must meet field standard; DVLA assessment required | Yes |
| Cataracts | May reduce acuity below standard; post-surgery review required | Yes (if affecting standard) |
| Diabetic retinopathy | Can affect acuity and field; DVLA assessment required | Yes |
| Macular degeneration | Affects central vision; likely to bar Group 2 driving | Yes |
| Monocular vision (one eye) | Usually bars Group 2 driving; DVLA individual assessment | Yes |
| Diplopia (double vision) | Bars Group 2 driving unless controlled | Yes |
| Blepharospasm | Bars Group 2 driving | Yes |
Monocular Vision and HGV Licences
Drivers who have lost the sight in one eye (monocular vision) generally cannot hold a Group 2 licence, because the binocular visual acuity standard of 6/9 cannot be met with one eye. However, the DVLA considers each case individually, and drivers who lost their sight in one eye before the age of driving (and therefore adapted to monocular vision) may be assessed differently from those who lost sight in adulthood. Any driver who loses sight in one eye must notify the DVLA immediately.
Regular Eye Tests: How Often Should HGV Drivers Test?
The D4 medical examination includes a basic visual screening, but it is not a substitute for a full optometric examination. The College of Optometrists recommends that adults have a full eye test every two years, or more frequently if advised by their optometrist. For HGV drivers, annual eye tests are strongly advisable given the higher visual standards required and the professional consequences of failing the D4 visual assessment.
Many conditions that affect vision — including glaucoma, diabetic retinopathy, and macular degeneration — develop gradually and may not cause noticeable symptoms until significant damage has occurred. Regular optometric examinations can detect these conditions early, when treatment is most effective and before they progress to the point of affecting driving fitness.
What Happens If You Fail the Visual Assessment?
If you fail the visual assessment during your D4 medical, the examining doctor will not complete the D4 form, and your licence application or renewal will not proceed. You should then consult an optometrist to determine whether your vision can be corrected to the required standard with glasses or contact lenses, or whether there is an underlying eye condition that requires treatment.
If an eye condition is diagnosed and treated (for example, cataract surgery or glaucoma treatment), you may be able to reapply for your licence once the condition is stable and your vision meets the required standard. The DVLA will typically require a specialist ophthalmologist's report before reinstating a Group 2 licence following an eye condition.
Practical Tips for Maintaining Good Vision
- Annual eye tests: Book a full optometric examination every year, not just when you notice problems. Many conditions are asymptomatic in their early stages.
- Wear your correction: If you need glasses or contact lenses to meet the driving standard, always wear them when driving. Driving without prescribed correction is both illegal and dangerous.
- Carry a spare pair: The Highway Code requires drivers who need glasses to carry a spare pair. A broken or lost pair of glasses should not prevent you from driving safely.
- Night driving: If you notice increasing difficulty with night driving — glare, halos around lights, or reduced contrast sensitivity — have your eyes tested promptly. These symptoms can indicate early cataracts or other conditions.
- Manage diabetes carefully: Diabetic retinopathy is the leading cause of preventable blindness in working-age adults in the UK. Tight blood sugar control, regular retinal screening, and prompt treatment of any retinopathy are essential for protecting both your vision and your licence.
Frequently Asked Questions
Can I drive an HGV with glasses? Yes. The Group 2 visual standards can be met with corrective lenses. You must always wear your glasses or contact lenses when driving and carry a spare pair.
What is the number plate test for HGV drivers? The DVSA practical driving test includes a number plate reading check at 20 metres. For HGV drivers, the Group 2 standard of 6/7.5 in the better eye is broadly equivalent to this, but the D4 medical uses a Snellen chart for a more precise assessment.
Do I need to tell the DVLA if I get glasses? No, not simply for getting glasses. However, if you have an eye condition that affects your fitness to drive — such as glaucoma, significant visual field loss, or vision that cannot be corrected to the Group 2 standard — you must notify the DVLA.
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