Colour Blindness in Children: A Parent’s Guide

Colour blindness is usually present from birth and is often not diagnosed until a child starts school — or even later. Early detection is important so that teachers and parents can provide appropriate support, and children are not mistakenly labelled as having learning difficulties.

How Common is Colour Blindness in Children?

Approximately 1 in 12 boys has some form of colour vision deficiency
Approximately 1 in 200 girls is affected
Most children with colour blindness have red-green CVD (deuteranomaly is most common)
Children rarely recognise or report colour vision problems — they simply assume everyone sees colours the same way they do

Children typically do not complain of seeing colours differently, because they have no frame of reference for “normal” colour vision. Instead, look for these behavioural signs:

Colouring oddly — using unusual colours for common objects (e.g., colouring the sun purple, or using brown for green grass)
Difficulty with colour-coded learning materials — coloured graphs, maps, charts in school
Confusion with certain colours — mixing up red and green, or green and brown consistently
Saying things “look the same” when they appear different to others
Reluctance to colour or draw — may avoid activities that reveal difficulty
Difficulty reading coloured text on certain background colours
Trouble identifying ripe fruit from unripe (red/green confusion on berries, tomatoes, etc.)

When to Test Your Child

Most paediatricians recommend testing colour vision:

At age 3–4 — if a family history of colour blindness exists
Before starting school — ideally around age 5–6
Immediately if a teacher raises concerns about colour confusion

In many countries, colour vision screening is not part of the standard school health check. You may need to request this specifically from your GP or optometrist.

How Colour Blindness is Tested in Children

For young children (under 6):

Paediatric colour matching tests (such as the Waggoner Test) use simple matching tasks rather than number identification
The Cambridge Colour Test can be adapted for young children

For older children:

Ishihara Test — the most common screening test; children need to be able to name numbers to use the standard version
Farnsworth D-15 — appropriate from around age 7 upward
Take a free test online — appropriate for children who can read numbers

Once diagnosed, there are many practical steps teachers and parents can take:

In the Classroom

Seat the child well — good lighting and proximity to the board help
Avoid red-green colour coding on worksheets, charts, and displays
Label items that rely on colour (e.g., label “red” and “green” on maps and diagrams)
Don’t mark corrections in red pen on white paper — try blue or black instead
Tell the school at the start of each year so teachers are aware

At Home

Label clothing to help with colour matching
Use apps that identify colours (e.g., “Color Blind Pal”, “Seeing AI”)
Choose board games that don’t rely on colour alone
Normalise the condition — help your child understand it is common and manageable

Does Colour Blindness Affect Academic Performance?

Colour blindness does not affect intelligence or general academic ability. However, it can create specific challenges:

Science and biology textbooks often use red-green colour coding
Geography maps frequently use colour-coded regions
Maths graphs and charts may use red/green for different data series
Art classes may be challenging

With awareness and reasonable adjustments, most colour-blind children perform just as well as their peers.

Will My Child Grow Out of It?

No. Congenital colour blindness is permanent and does not improve with age. The brain may develop some compensatory strategies over time, but the underlying cone cell deficiency does not change.

Frequently Asked Questions

My daughter was just diagnosed with colour blindness. How did she inherit it? She likely inherited one defective gene from each parent — from her father (who is colour blind) and her mother (who is a carrier). This is uncommon but not rare.

Should I tell my child’s teacher? Yes — as early as possible at the start of each school year. Provide a brief note explaining the type of CVD and asking for colour-independent learning materials where possible.

Can a colour-blind child become a pilot or doctor? Commercial aviation typically requires normal colour vision. However, many medical specialties have no colour vision requirements. Each profession has different standards — check with the relevant regulatory body.

Are there special glasses for colour-blind children? Yes — filtered lenses (e.g., EnChroma) are available for children and may help some children with red-green CVD distinguish colours more effectively. Results vary, and they are not a cure.