Author: Dr Val Phua
Estimated reading time: 8–10 minutes
Good Vision Is Essential for Safe Driving
Driving is a visually demanding activity. Every time you get behind the wheel, your eyes are constantly processing road signs, traffic lights, pedestrians, cyclists and other vehicles—all while judging speed, distance and movement.
In fact, it is estimated that around 90% of the information needed for safe driving is obtained through vision.
Many eye conditions develop gradually, meaning drivers may not realise that their eyesight has deteriorated until it begins affecting their ability to drive safely.
Regular eye examinations not only help protect your vision but also help ensure that you continue to meet the visual standards required for driving in Singapore.
Why Good Vision Matters
Safe driving depends on several aspects of vision, including:
Visual Acuity
Visual acuity measures how clearly you can see details at a distance.
Good visual acuity allows you to:
- Read road signs
- Recognise pedestrians
- Identify traffic lights
- Judge road hazards early
Peripheral Vision (Visual Field)
Peripheral vision allows you to detect:
- Vehicles approaching from the side
- Cyclists
- Motorcyclists
- Pedestrians stepping off the pavement
Loss of side vision, particularly from glaucoma or stroke, may significantly affect driving safety.
Contrast Sensitivity
Contrast sensitivity helps you detect objects in:
- Rain
- Fog
- Dim lighting
- Night driving
This often declines before visual acuity does, particularly in cataracts.
Colour Vision
Drivers need to distinguish:
- Red
- Amber
- Green
This is particularly important for recognising traffic signals.
Colour vision is generally more relevant for vocational drivers than for private licence holders.
Common Eye Conditions That Affect Driving
Cataracts
Cataracts commonly cause:
- Glare from headlights
- Halos around lights
- Reduced night vision
- Poor contrast sensitivity
Many patients first notice difficulty driving at night before recognising any daytime visual problems.
Glaucoma
Glaucoma damages peripheral vision.
Because central vision often remains good until late in the disease, patients may be unaware that significant visual field loss has occurred.
Age-Related Macular Degeneration (AMD)
AMD affects central vision and may make it difficult to:
- Read road signs
- Recognise faces
- Judge fine detail
Diabetic Eye Disease
Diabetic retinopathy and diabetic macular oedema may cause:
- Blurred vision
- Fluctuating vision
- Reduced contrast sensitivity
Retinal Conditions
Retinal detachment, retinal vein occlusion and retinal artery occlusion may all affect driving depending on the severity and location of vision loss.
Singapore Driving Vision Requirements
In Singapore, visual standards for drivers are determined by the Traffic Police (TP) and, for vocational drivers, the Land Transport Authority (LTA).
For private driving licences (Class 1–3), drivers generally require:
- Visual acuity of at least 6/12 in one eye (with or without spectacles or contact lenses).
- If the poorer eye has reduced vision, an adequate horizontal visual field is also required.
For vocational drivers (such as taxi, bus and private-hire drivers), more stringent standards apply, including:
- Good visual acuity in both eyes
- Adequate colour vision
- Periodic medical examinations, particularly from age 50 onwards, with more frequent assessments after age 65.
If you require spectacles or contact lenses to meet the required visual standard, these should be worn whenever driving.
Medical Reviews for Older Drivers
Singapore does not impose a mandatory upper age limit for driving.
However:
- Drivers aged 65 years and above are required to undergo periodic medical examinations for licence renewal.
- Vocational licence holders have additional medical assessment requirements administered by the LTA.
These reviews help ensure that drivers remain medically fit to drive safely.
When Should You Stop Driving?
Many eye conditions can be treated successfully, allowing patients to continue driving safely.
However, you should seek an urgent eye examination if you experience:
- Sudden loss of vision
- Double vision
- Severe glare
- Significant loss of peripheral vision
- New flashes and floaters
- Distortion of vision
Until you have been assessed, it may be safer to avoid driving.
What Happens During a Driving Vision Assessment?
A comprehensive assessment may include:
Visual Acuity Testing
Measures how clearly you can see at distance.
Refraction
Determines whether updated spectacles may improve vision.
Visual Field Testing
Particularly important for glaucoma, neurological disease and patients with vision in only one eye.
Colour Vision Assessment
Performed when required for vocational driving or selected occupations.
Slit Lamp Examination
Looks for cataracts, corneal disease and other anterior eye conditions.
Dilated Retinal Examination
Assesses retinal diseases that may affect driving.
Optical Coherence Tomography (OCT)
May be performed when retinal disease or optic nerve disease is suspected.
Tips for Safer Driving
You can help protect yourself and other road users by:
- Having regular eye examinations.
- Wearing your prescribed spectacles while driving.
- Avoiding driving if your vision suddenly changes.
- Limiting night driving if you experience severe glare.
- Keeping your windscreen clean.
- Wearing sunglasses with UV protection during bright daylight.
- Taking regular breaks during long journeys.
Frequently Asked Questions
Can I drive if I have cataracts?
Many people with early cataracts continue driving safely. However, if cataracts significantly reduce vision or cause troublesome glare—especially at night—cataract surgery may be recommended.
Can I drive with glaucoma?
Many patients with glaucoma can continue driving, particularly when the disease is diagnosed early and well controlled. Regular visual field testing is important to monitor whether vision remains adequate for safe driving.
Can I drive after cataract surgery?
Yes. Most patients resume driving once their vision has stabilised and they meet the legal visual requirements. Your ophthalmologist will advise when it is safe to do so.
What if I only have good vision in one eye?
Some people with useful vision in only one eye may still be able to drive if they meet the required visual acuity and visual field standards. Individual assessment is important.
The Bottom Line
Good vision is fundamental to safe driving. Regular eye examinations help detect conditions such as cataracts, glaucoma and retinal disease before they significantly affect your ability to drive.
If you notice changes in your vision—or if you have been diagnosed with an eye condition—it is important to seek professional advice rather than assume your eyesight remains adequate for driving.
Protecting your vision protects not only your own safety, but also the safety of everyone sharing the road.
References
- Land Transport Authority – Harmonised Medical Examination Report. Medical examination requirements for driving and vocational licences.
- Woodlands Health – Visual Requirements for Driving. Summary of Singapore driving vision standards.
- Singapore Traffic Police – Medical Examination Changes for Drivers. Guidance on periodic medical examinations for older and vocational drivers.
- American Academy of Ophthalmology. Vision and Driving Safety.
- National Eye Institute. Driving and Vision.
