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Home Colour Blindness Test: What Really Works? (Video)

1:50 minWatch on YouTube

Read the full written guide: Colour Blindness Test at Home: Signs in Children and Job Limits →

Learn how to spot early signs of colour vision deficiency in children and understand the limits of online tests. We break down what the eye actually sees and why a professional check matters.

Get practical tips for home screening, know when to seek an optometrist, and discover how colour vision can affect school, driving and career choices. This guide is for information only, not medical advice.

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Transcript

Can a phone test really spot colour blindness?

Can a phone test really spot colour blindness?

Colour Blindness Test at Home

Stay tuned to learn how a simple home check can guide you, and the one essential tip you’ll need later. We'll break down what online apps can and cannot tell, and why a professional check matters.

What colour blindness really means

Your retina holds three types of cones, red, green and blue. The brain mixes their signals like paint to create every hue. When one cone is weak, certain colours get mixed up.

Signs in children by age

Kids under three are too young for reliable clues, so you wait. Between three and six, they may mix up red and green crayons or choose odd colour combos. After six, they might struggle with coloured chalk on boards, maps, graphs, or even judging if meat is cooked.

Screen distance

Keep the screen about 75 centimeters away, roughly an arm’s length, for the most reliable result.

Home test tips

For a home screen, sit by a window in daylight, set the device to full brightness, and turn off night mode or blue-light filters. Test one child at a time, no whispering answers. Write down which plates are missed, then schedule a proper optometrist visit.

Professional Ishihara test

The standard screening uses printed Ishihara plates under good light. One eye is tested at a time, and the child reads the hidden number or traces the line. It takes only a few minutes, causes no pain, and any missed plates lead to further tests.

Key age

Detect colour vision issues by age eight, not later, to keep school and career choices smooth.

The one key tip

If your home screen flags any difficulty, the next step is a proper optometrist exam with printed Ishihara plates, online apps can only hint, they can’t confirm.

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Read the full guide

Read the complete guide on thecareonline.com. This is general information, not medical advice.

Nothing on The Care Online is medical advice. Traditional practices are described as tradition, not as fact. Take a persistent or serious concern to a qualified professional. See how videos and posts are made on our methodology page.