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Colour Blindness

By Skyemont Health Editorial Team July 1, 2026 1 min read

Colour Blindness and Driver Medicals: Tests and Driving Standards

Colour-vision deficiency does not usually prevent someone from driving, although particular licence categories or safety-critical roles may have additional requirements. A driver medical focuses on the applicable eyesight standard and any other eye condition that could affect safe driving.

What Is Colour Blindness?

Colour blindness, also known as colour vision deficiency, affects a person’s ability to distinguish certain colours. The most common form makes it difficult to tell the difference between shades of red and green, although other types also exist.

Many people are born with colour blindness and may not realise they have it until later in life. In most cases, it does not affect everyday vision, reading, driving or general eye health.

Can You Drive If You’re Colour Blind?

Yes. Most people with colour blindness are legally able to drive and continue to hold both ordinary and vocational driving licences.

Road signs, traffic lights and road markings are designed using their position, shape and brightness as well as colour, allowing drivers with colour vision deficiency to recognise them safely.

Will Colour Blindness Affect My Driver Medical?

In most cases, no.

A driver medical focuses primarily on whether you meet the required eyesight standards, including visual acuity and your field of vision. Colour blindness alone does not usually prevent someone from meeting these standards.

Provided your overall eyesight meets the required standard for your licence category, colour blindness alone is unlikely to affect the outcome of your medical.

Do HGV and PCV Drivers Need Perfect Colour Vision?

No. Professional drivers are required to meet higher eyesight standards than ordinary car drivers, but this relates to visual acuity and field of vision rather than perfect colour perception.

Many HGV, LGV and PCV drivers with colour blindness continue to drive professionally throughout their careers.

What If I Wear Glasses or Contact Lenses?

Bring the glasses or contact lenses you use for driving so the vision check reflects your usual correction.

Corrective lenses can help you meet the required visual acuity standards but they do not correct colour blindness. Fortunately, this is rarely a problem during driver medicals.

What Happens During the Vision Assessment?

As part of your driver medical, your eyesight will normally be assessed to ensure you meet the required standard for your licence category.

This may include:

  • Distance visual acuity.
  • Vision in each eye.
  • Vision while wearing your usual glasses or contact lenses.
  • Discussion of any significant eye conditions.

A routine driver medical does not normally involve a specific colour blindness test.

Can Colour Blindness Develop Later in Life?

Most colour blindness is inherited and present from birth. However, changes in colour vision later in life can occasionally occur because of certain eye conditions, medical conditions or medications.

If you notice a sudden change in your colour vision, you should arrange an eye examination as soon as possible.

What If I Also Have Another Eye Condition?

Colour blindness alone rarely causes problems during a driver medical. However, if you also have another eye condition such as glaucoma, cataracts, diabetic eye disease or macular degeneration, additional assessment may sometimes be required.

The examining doctor will consider your overall eyesight rather than colour vision alone.

Preparing for Your Driver Medical

To help your appointment run smoothly:

  • Bring your driving glasses or contact lenses if you wear them.
  • Bring any recent optician or ophthalmology letters if applicable.
  • Bring your medical form if you already have it.
  • Bring valid photographic identification.
  • Tell the doctor about any recent changes to your eyesight.

Appointments and support

Vision checks for vocational driver medicals are available at Skyemont Health clinics throughout Northern Ireland. Bring the glasses or contact lenses you normally use for driving.

External Resources

Book a Vision Driver Medical

Book online and bring your usual driving glasses or contact lenses, along with any recent optician’s report.