Visual disorders: assessing fitness to drive
Source: gov.uk (2025-09-26)

Advice for medical professionals to follow when assessing drivers with visual disorders.

Minimum eyesight standards – all drivers

The law requires that all licensed drivers to meet the following eyesight requirements (including drivers aided by prescribed glasses or contact lenses):
- at a distance of 20 metres with letters and numbers 79 mm high by 50 mm wide on a car registered since 1 September 2001 or
- at a distance of 20.5 metres with letters and numbers 79 mm high by 57 mm wide on a car registered before 1 September 2001 and
- the visual acuity must be at least Snellen 6/12 with both eyes open or in the only eye if monocular
✘- Any driver unable to meet these standards must not drive and must notify DVLA, which will refuse or revoke a licence.

The law also requires all drivers to have a minimum field of vision, as set out below.

Bioptic telescope devices are not accepted by DVLA for driving.

Higher standard of visual acuity – bus and lorry drivers

Group 2 bus and lorry drivers require a higher standard of visual acuity in addition:
- Snellen 6/7.5 (Snellen decimal 0.8) in the better eye and
- Snellen 6/60 (Snellen decimal 0.1) in the poorer eye
- if glasses are worn to meet the minimum standards, they should have a corrective power not exceeding +8 dioptres in any meridian of either lens
Minimum standards for field of vision – all drivers

The minimum field of vision for Group 1 driving is defined in the legislation:

A field of at least 120° on the horizontal measured using a target equivalent to the white Goldmann III4e settings.

The extension should be at least 50° left and right. In addition, there should be no significant defect in the binocular field that encroaches within 20° of the fixation above or below the horizontal meridian.

This means that homonymous or bitemporal defects that come close to fixation, whether hemianopic or quadrantanopic, are not usually acceptable for driving.

If DVLA needs a visual field assessment for determining fitness to drive, it:
- requires the method to be a binocular Esterman field test
- may request monocular full field charts in specific conditions
- exceptionally, may consider a Goldmann perimetry assessment carried out to strict criteria
The Secretary of State’s Honorary Medical Advisory Panel for Visual Disorders and Driving advises that, for an Esterman binocular chart to be considered reliable for licensing, the false-positive score must be no more than 20%. When assessing monocular charts and Goldmann perimetry, fixation accuracy will also be considered.

Defect affecting central area only (Esterman within 20 degree radius of fixation)

Only for the purposes of licensing Group 1 car and motorcycle driving:
- scattered single missed points
- a single cluster of up to 3 adjoining points
- a cluster of 4 or more adjoining points that is either wholly or partly within the central 20° area
- loss consisting of both a single cluster of 3 adjoining missed points up to and including 20° from fixation, and any additional separate missed points within the central 20° area
- any central loss that is an extension of hemianopia or quadrantanopia of size greater than 3 missed points
Defect affecting the peripheral areas – width assessment

Only for the purposes of licensing Group 1 car and motorcycle driving:
- a cluster of up to 3 adjoining missed points, unattached to any other area of defect, lying on or across the horizontal meridian
- a vertical defect of only single-point width but of any length, unattached to any other area of defect, which touches or cuts through the horizontal meridian
Exceptional cases

Group 1 drivers whose previous full driving entitlement was removed because of a field defect failing to satisfy the standard may be eligible for individual relicensing consideration as exceptional cases under the following strict criteria:
- present for at least 12 months
- caused by an isolated event or a non-progressive condition
- there must be no other condition or pathology regarded as progressive and likely to be affecting the visual fields (panel’s advice is that certain medical conditions, for example glaucoma and retinitis pigmentosa, would always be considered as progressive and so could not be considered as exceptional cases)
- sight in both eyes
- no uncontrolled diplopia
- no glare sensitivity, contrast sensitivity or impairment of twilight vision
- clinical confirmation of full functional adaptation
For exceptional cases considered to be potentially licensable under these criteria, DVLA will require a satisfactory practical driving assessment at an approved centre (see Appendix H) (https://www.gov.uk/guidance/appendices-assessing-fitness-to-drive#appendix-h-mobility-centres-and-driving-assessment-centres).

Static visual field defect

For prospective learner drivers with a static visual field defect, a process is now in place to apply for a provisional licence. For further information, see ‘Applying for a provisional licence if you’ve got a static visual field defect’ (https://www.gov.uk/government/publications/static-visual-field-defects-new-process).

Monocular individuals cannot be considered as exceptional cases under the above criteria.

Higher standards of field of vision – bus and lorry drivers

The minimum standard for the field of vision is defined by the legislation for Group 2 bus and lorry licensing as:
- an uninterrupted measurement of at least 160° on the horizontal plane
- extensions of at least 70° left and at least 70° right
- extensions of at least 30° above and at least 30° below the horizontal plane
- no significant defect within 70° right and 70° left between 30° up and 30° down (it would be acceptable to have a total of up to 3 missed points, which may or may not be contiguous*)
- no defect is present within a radius of the central 30°
- no other impairment of visual function, including no glare sensitivity, contrast sensitivity or impairment of twilight vision.
(*Points tested in the ‘letterbox’ outside the central radius of 30° from fixation.)

For Group 2 bus and lorry driving, it would be acceptable for a defect on visual field charts to have an upper limit of a total of 3 missed points – which may be contiguous – within the letterbox but outside the central 30° radius.

A total of more than 3 missed points, however – even if not contiguous – would not be acceptable for Group 2 driving because of the higher standards required.

Note that no defects of any size within the letterbox are licensable if a contiguous defect outside it means the combination represents more than 3 missed points.

Note Exception 1 in ‘Exceptions allowed by older licences’ below.

Clinically apparent visual inattention will be debarring for Group 1 and Group 2.

Cataract

Monocular vision

Exceptions for visual acuity allowed by older licences (‘grandfather rights’)

The standards for Group 1 car and motorcycle licensing must be met before any of the following exceptions can be afforded to Group 2 bus and lorry drivers holding older licences.

Visual acuity

Exception 1

A driver must have been awarded a Group 2 bus and lorry licence before 1 March 1992, and be able to complete a satisfactory certificate of experience, to be eligible.

If the licence was awarded between 2 March 1992 and 31 December 1996, visual acuity with corrective lenses if needed must be at least 6/9 in the better eye and at least 6/12 in the other eye; uncorrected visual acuity may be worse than 3/60 in one eye only.

Monocularity

Exception 2

Must have been awarded a Group 2 bus and lorry licence before 1 January 1991, with the monocularity declared before this date.

Exception 3

Drivers with a pre-1997 Group 1 licence who are monocular may apply to renew their category C1 (vehicles 3.5t to 7.5t). They must be able to meet the minimum eyesight standards which apply to all drivers and also the higher standard of field of vision for Group 2 (bus and lorry) drivers.

Visual field defects

Diplopia

Nyctalopia

Colour blindness

Blepharospasm

Nystagmus