Living with colour-vision differences

Notice the pattern, not just one mistake

• Red–green difficulties are the commonest pattern. Blue–yellow differences also occur; a complete lack of colour perception is rare.
• Confusion when sorting colours, reading colour-coded charts or choosing pencils can be a reason to ask about testing. One mistaken colour name is not a diagnosis.

Distinguish a lifelong difference from a new change

• Many people inherit the condition and adapt from childhood. Colour vision can also change with eye disease, injury or some medicines.
• Tell your eye-care team when you first noticed the change. Do not stop prescribed medicine without advice.

Ask for the right assessment

• An eye-care professional may use colour-dot plates, such as Ishihara, or tests that involve arranging shades. The test depends on the question being investigated.
• Online exercises can prompt a discussion, but do not replace a professional diagnosis or an assessment required for work.

Build other cues into daily tasks

• Use written labels, shapes or patterns alongside colour. Tell your child’s teacher so colour-only instructions can be adapted.
• A colour-identification app may help with some tasks. For a career with colour-vision requirements, ask for the relevant formal assessment.

Be realistic about treatment claims

There is no established cure for inherited colour-vision deficiency. Some filters help distinguish particular colours, but do not restore normal colour vision. Acquired changes may improve when the underlying cause is treated; ask your clinician what applies to you.