HGV Driver Vision Standards: DVLA Requirements, Tests & What Happens If You Fail
Vision is the most fundamental sensory requirement for safe professional driving. The DVLA applies strict vision standards to Group 2 (HGV and PCV) licence holders, and failing to meet these standards at a D4 medical examination will result in a licence refusal or revocation. Understanding the specific requirements — and how to ensure you meet them — is essential for every professional driver.
This guide covers the DVLA's Group 2 vision standards for 2026, including visual acuity, visual field, colour vision, and the impact of specific eye conditions such as cataracts, glaucoma, and monocular vision.
DVLA Group 2 Vision Standards (2026)
The DVLA's vision standards for Group 2 drivers are set out in the "Assessing Fitness to Drive" guidance document and are more stringent than those for Group 1 (car) drivers. The key requirements are as follows:
| Vision Requirement | Group 2 Standard | Notes |
|---|---|---|
| Visual acuity (both eyes together) | At least 6/7.5 (Snellen) with both eyes open | Corrective lenses permitted |
| Visual acuity (worse eye) | At least 6/60 (Snellen) | Corrective lenses permitted |
| Visual field (binocular) | At least 160° horizontal; 70° left and right; 30° above and below central fixation | No significant defect in binocular field |
| Diplopia (double vision) | Must be absent | Monocular driving not permitted for new Group 2 applicants |
| Night vision | No significant impairment | Assessed by examining doctor |
Visual Acuity: What the Numbers Mean
Visual acuity is measured using a Snellen chart — the familiar letter chart used by opticians. The fraction 6/7.5 means you can read at 6 metres what a person with normal vision can read at 7.5 metres. This is a relatively high standard: it is approximately equivalent to 20/25 in the American notation used in some optician reports.
The requirement for the worse eye is 6/60 — meaning you can read at 6 metres what a person with normal vision can read at 60 metres. This is a low threshold, but it is important because it means that drivers with very poor vision in one eye (but good vision in the other) may still qualify, provided the binocular vision and visual field requirements are met.
Corrective lenses (glasses or contact lenses) are permitted to meet the visual acuity standard. If you wear corrective lenses, you must wear them whenever driving professionally, and you must declare this on your licence application. The DVLA may add a code to your licence requiring corrective lenses to be worn at all times when driving.
Visual Field Requirements
The visual field requirement is particularly important for HGV drivers because peripheral vision is essential for safe manoeuvring of large vehicles in tight spaces and for detecting hazards at the edges of the visual field. The Group 2 standard requires a binocular visual field of at least 160° horizontal, with at least 70° to the left and right of centre, and at least 30° above and below central fixation.
Visual field defects can be caused by a range of conditions, including glaucoma, retinal detachment, stroke, and brain tumours. If a visual field defect is identified at the D4 medical, the examining doctor will refer the driver to an ophthalmologist for a formal visual field assessment. The DVLA will then review the specialist report before deciding whether to grant or refuse the licence.
Common Eye Conditions and Their Impact on HGV Licences
Cataracts: Cataracts cause gradual clouding of the lens, reducing visual acuity and contrast sensitivity. Mild cataracts may not affect driving fitness, but significant cataracts that reduce acuity below the 6/7.5 standard will result in licence refusal until treated. Cataract surgery typically restores vision to a level compatible with Group 2 driving, and most drivers can return to professional driving within 4–6 weeks of surgery, subject to a satisfactory post-operative assessment.
Glaucoma: Glaucoma causes progressive damage to the optic nerve, typically resulting in loss of peripheral vision. The impact on Group 2 driving fitness depends on the extent of the visual field loss. Drivers with early glaucoma and minimal visual field loss may meet the Group 2 standard; those with significant field loss will not. Regular monitoring by an ophthalmologist is essential, and any significant deterioration must be reported to the DVLA.
Monocular Vision: Drivers who have lost the sight of one eye (monocular vision) cannot meet the Group 2 visual field standard and are not permitted to hold a new Group 2 licence. Drivers who were already licensed before losing the sight of one eye may be considered on an individual basis, but this is rare and subject to specialist assessment.
Diabetic Retinopathy: Diabetes can cause damage to the blood vessels in the retina, leading to visual impairment. Drivers with diabetes must declare the condition on their D4 form, and any significant retinopathy that affects visual acuity or visual field will result in licence refusal until the condition is treated and vision is restored to the required standard.
The Vision Test at Your D4 Medical
At your D4 medical examination, the examining doctor will assess your vision using a Snellen chart and a visual field test. The Snellen chart test is typically conducted at a distance of 6 metres, with and without corrective lenses if applicable. The visual field test may be a simple confrontation test (the doctor moves a finger from the periphery towards the centre of your visual field) or a more formal perimetry test if there is any concern about peripheral vision.
If the examining doctor has any concerns about your vision, they may refer you to an ophthalmologist for a more detailed assessment before completing the D4 form. It is advisable to have a recent eye test from a registered optician before your D4 medical, as this will give you a clear picture of your current visual acuity and identify any issues that need to be addressed.
Frequently Asked Questions
Can I drive an HGV if I wear glasses or contact lenses?
Yes, provided your corrected visual acuity meets the Group 2 standard (6/7.5 with both eyes open, 6/60 in the worse eye). You must wear your corrective lenses whenever driving professionally, and this requirement will be noted on your licence.
What happens if I fail the vision test at my D4 medical?
If your vision does not meet the Group 2 standard, the examining doctor will note this on the D4 form. The DVLA will then refuse or revoke your licence until your vision is corrected to the required standard. In many cases, this can be achieved with updated prescription glasses or contact lenses, or through treatment of an underlying eye condition.
Can I drive an HGV with one eye?
Generally no. Monocular vision (loss of sight in one eye) means you cannot meet the Group 2 binocular visual field standard. New applicants with monocular vision will not be granted a Group 2 licence. Existing licence holders who lose the sight of one eye must notify the DVLA immediately and cease driving until the DVLA has assessed their case.
How often is vision tested for HGV drivers?
Vision is assessed at every D4 medical examination: at initial application and at every renewal (every 5 years from age 45 to 65, then annually from age 65). However, drivers must also notify the DVLA if their vision deteriorates significantly between medicals.
