Driving and vision

Vision skills needed for driving

Driving relies on more than reading a number plate. Peripheral awareness helps at junctions, and contrast sensitivity matters in rain and dusk.

• Clear distance vision for signs, signals and hazards
• Adequate side vision for merging and pedestrians
• Coping with glare from headlights and low sun
• Depth perception and single clear vision, not double

Common problems that affect drivers

Cataracts cause glare and hazy vision, especially at night. Uncorrected short-sightedness makes signs blurry. Dry eye and unclean windscreens add glare. Some conditions, including advanced glaucoma, reduce side vision and make driving less safe even when central vision seems acceptable.

Practical steps

Keep your prescription current, clean glasses and mirrors, and use visors against low sun. Allow extra time at night and avoid driving when very tired. An optometrist can advise on tint, varifocals or whether vision meets general safety expectations — legal standards vary by country.

When to stop and seek advice

Stop driving and arrange an urgent eye test if you develop sudden blurred vision, double vision, a curtain across sight, or severe glare that makes oncoming lights unbearable. Tell your clinician you drive so they can advise on safety.