Driving and safety advice after visual-field loss

01Role and principlesWho benefits and the main preventive aims.

Visual-field loss removes awareness of part of the surrounding scene. It may follow retinal disease, optic nerve damage or a lesion of the visual pathways. Someone may read small letters centrally yet fail to detect a pedestrian approaching from one side. Assessing driving therefore requires more than the Snellen chart, a familiar journey completed successfully or the patient's confidence.

The immediate clinical responsibilities are to identify the cause, prevent an unsafe journey and explain the next steps. Longer-term decisions combine visual function, the relevant vehicle category and the licensing authority's assessment. Loss of driving can threaten employment, caring responsibilities and social contact, so practical transport and rehabilitation support belong alongside the medical advice.

Key points

Visual acuity and visual field assess different requirements for safe driving.
DVLA covers England, Scotland and Wales; DVA administers driver licensing in Northern Ireland.
A driver with a visual-field defect must notify the appropriate licensing agency.
New unassessed field loss means stopping driving while urgent assessment is arranged.
Licensing field assessment usually uses binocular Esterman testing when requested by DVLA.
Rehabilitation can improve practical adaptation without establishing that legal driving standards are met.

02Assessment and patient selectionRisk features, eligibility and important cautions.

Establish the actual driving context

Ask whether the person currently drives, which vehicles they drive and which licensing jurisdiction applies. A car licence and a bus or lorry entitlement have different visual standards. Record recent collisions, missed hazards, near misses and whether another person has noticed difficulty.

Characterise the field complaint

Clarify whether the missing area affects one eye or the same side of the scene with either eye open. Ask about onset, progression and associated central blur or double vision. A new defect needs diagnostic assessment before it becomes a routine licensing discussion.

Assess awareness and attention

Observe how the person navigates the room and attends to people or objects on either side. Hemianopia and visual inattention can coexist but are not interchangeable diagnoses. Inattention affects how stimuli are processed and may not be captured by a simple report of missing vision. Clinically apparent visual inattention bars both Group 1 and Group 2 driving under DVLA guidance.

Explore everyday hazards and priorities

Ask about steps, road crossing, cooking, reading medicine labels and work around moving equipment. The practical effect depends on the location of loss, cognition, mobility and the environment. Invite the person to identify the activities they most need help to continue safely.

Red flags requiring action

Sudden persistent field loss requires urgent diagnosis even when central acuity remains normal.
New field loss with weakness, speech disturbance or other focal neurological symptoms requires emergency stroke assessment.
A patient continuing to drive despite an unsafe visual deficit needs prompt review under GMC confidentiality guidance.
Visual inattention or poor awareness of the deficit may make self-reported driving confidence particularly unreliable.

03Baseline assessmentMeasurements that guide the plan and track progress.

Investigation order

Read from the initial assessment onwards. Tests may run in parallel in urgent care; first-line, preferred, confirmatory, definitive and gold-standard labels appear only when the chapter explicitly states them.

01
Visual acuity and ocular examinationFirst step
Why
Measure central function and investigate an ocular contribution.
Interpretation and limitations
Corrected acuity is one element of fitness assessment. Group 1 driving requires at least 6/12 with both eyes open, or the only seeing eye, and reading a current-format number plate at 20 metres in good daylight with correction if needed. The separate field requirements must also be met.
02
Clinical visual-field assessment
Why
Localise the deficit and guide its diagnostic investigation.
Interpretation and limitations
Confrontation testing can identify a major defect but cannot certify licensing compliance. Formal monocular tests help characterise disease; reliability and the relationship between the two eyes matter when interpreting the overall functional loss.
03
Licensing binocular field assessment
Why
Provide the field evidence required for an agency decision.
Interpretation and limitations
When DVLA requires visual-field assessment, it normally requires binocular Esterman testing and may request additional charts for particular conditions. The agency considers defect pattern and test reliability; the DVLA reliability limit for Esterman false positives is no more than 20%.
04
Orthoptic and functional assessment
Why
Assess adaptation, eye movements, attention and daily safety.
Interpretation and limitations
After stroke, NICE recommends specialist orthoptist assessment promptly in hospital or an urgent outpatient appointment if it cannot occur before discharge. Occupational and rehabilitation assessments identify task-specific needs; neither substitutes for the licensing authority's requirements.

04InterventionsLifestyle, treatment and escalation options.

01Immediate advicePrevent an unsafe journeyFirst stepA new visual-field defect is identified or suspected during assessment.

1Explain that the person should not drive while the new defect is being assessed.
2Arrange emergency investigation where indicated and confirm a safe way home or to the receiving service.
3Record the advice, the person's understanding and the agreed route for further assessment.

02Licensing notificationUse the correct authority and categoryA visual-field defect is established in someone who holds a driving licence.

1Explain the driver's duty to notify DVLA in Great Britain or DVA in Northern Ireland.
2Identify the relevant car, motorcycle, bus or lorry category and obtain the appropriate specialist evidence.
3Clarify that notification and assessment do not by themselves authorise driving when the person fails the standard.

03Persistent functional lossSupport adaptation and review entitlementA stable defect continues to affect mobility, work or confidence.

1Arrange targeted visual rehabilitation and practical transport support while the cause continues to receive appropriate care.
2Review functional change and reliable field results without promising that training will restore the missing field.
3Where an exceptional licensing route might apply, support the formal application rather than declaring independent permission to drive.

04Continued unsafe drivingFollow the GMC disclosure processThe patient continues to drive despite advice and remains a serious safety concern.

1Make every reasonable effort to persuade the person to stop and explain the possible need for disclosure.
2If refusal exposes others to death or serious harm, promptly disclose relevant information confidentially to the agency's medical adviser.
3Try to inform the patient beforehand, consider objections, then confirm disclosure in writing and document the decision.

05Targets, monitoring and follow-upResponse, safety and longer-term review.

Document the field diagnosis, likely course, acuity, vehicle category, notification advice and who will coordinate the next assessment.
At follow-up, ask whether driving has actually stopped and whether transport difficulties are undermining access to treatment or essential activities.
Review falls, collisions with obstacles, reading difficulties and rehabilitation goals using the person's own priorities and observed function.
Check whether the defect is stable or progressive before discussing exceptional licensing; new deterioration requires renewed clinical and driving advice.
Provide written information in an accessible format and confirm that the patient can locate the contact details and understand the next action.

06Special situationsVariants, exceptions and circumstances that change the usual approach.

Know the Group 1 field threshold

For car and motorcycle licensing, the ordinary minimum horizontal field is 120 degrees, extending at least 50 degrees to each side. There must be no significant binocular defect encroaching within 20 degrees of fixation above or below the horizontal meridian. DVLA applies detailed rules to central and peripheral missed points; an approximate sketch cannot establish compliance.

Higher entitlements require higher standards

Group 2 bus and lorry licensing requires at least 160 degrees horizontally, extending at least 70 degrees each side and 30 degrees above and below. No defect is permitted within the central 30-degree radius, and specific limits apply to peripheral missed points. These drivers also have stricter acuity requirements. Do not transfer a favourable Group 1 assessment to a vocational entitlement.

Exceptional relicensing is a formal process

In Great Britain, some previous Group 1 licence holders with a field defect from an isolated event or non-progressive condition may be considered exceptionally after at least 12 months. They need sight in both eyes, full functional adaptation, no uncontrolled diplopia, no additional glare, contrast-sensitivity or twilight-vision impairment and no progressive field-affecting pathology. DVLA requires a satisfactory approved practical assessment. Time elapsed alone never grants permission.

Northern Ireland has its own process

DVA requires notification of a visual-field disorder and provides its own medical forms and exceptional-case application route. Its published criteria include an established non-progressive defect, preserved sight in both eyes and functional adaptation, followed by the required assessment. Use the Northern Ireland process rather than sending a DVLA form to the wrong agency.

Compensation and restoration are different

For persistent hemianopia after stroke, NICE recommends eye movement therapy. Scanning strategies and task practice aim to help the person find information within their environment. Explain that improved performance on a familiar task does not prove restoration of the sensory field or safe driving in unpredictable traffic.

Make independence a concrete goal

Translate the field assessment into individual changes such as safer organisation of frequently used objects, clearer walking routes and a consistent reading strategy. Consider referral to occupational therapy, orthoptics and low-vision services according to the deficit. Review whether changes help in the real setting instead of assuming that written advice has solved the problem.

07Common pitfallsFrequent interpretation and management errors.

01
Using normal central acuity or a successful number-plate test as proof of adequate peripheral vision.
02
Assuming that a stable hemianopia automatically becomes licensable when twelve months have passed.
03
Confusing improved visual scanning with permission to drive despite a failed field standard.
04
Applying car-driver criteria to a bus or lorry entitlement without checking the higher requirements.
05
Treating the patient's promise to avoid motorways as an adequate response to an unsafe field defect.
06
Ignoring the effect of lost transport on medication access, employment and attendance for eye care.