Colour blindness
Colour blindness is a particularity in the perception of colours: certain shades, most often red and green, blend together or look almost identical. The person sees shapes, outlines and details perfectly; what changes is the reading of the information carried by the colour. The same red and the same green may appear to them as two very close shades of brown or grey.
Far from being an absence of vision, colour blindness often goes unnoticed for a long time, sometimes into adulthood, because the person has learned to find their bearings differently: by position, context or habit. It becomes a problem mainly when an instruction, a code or a cue relies on colour alone, with no other clue to back it up.
A chart in class with green boxes for "mastered" and red ones for "to review", a red curve and a green curve on the same background, a metro map made entirely of coloured lines: for a person with colour blindness, these cues fall flat. The information is there, it is simply coded in the one dimension they do not perceive the way others do.
The most tiring part is not the colour itself, it is having to point it out to every new person, to every teacher, to every colleague who hands over a document saying "look, it is marked in red". Being able to state it once and for all, clearly and calmly, avoids having to explain oneself in a meeting or in front of the class.
What color blindness changes day to day
A common assumption is that it means "not seeing colors" at all. In reality, most people concerned see a wide range of shades; what tends to blur is certain pairs of colors, especially red and green, sometimes blue and yellow. The difficulty appears when color alone is used to carry a message.
- Spotting a piece of information on a chart, a map or a table coded by shades only.
- Reading signals such as a red or green light, an indicator or a traffic light in the distance.
- Matching clothes, judging how cooked a piece of meat is or whether a fruit is ripe.
- Following an instruction like "click the green button" with no other cue.
What actually helps
Most obstacles disappear as soon as information no longer relies on color alone. Pairing color with another cue (a word, a pattern, a position, a symbol) is usually enough. Mentioning the particularity once to the people around you avoids repeated misunderstandings and awkward remarks.
- Adding a label or a pictogram next to each color used as a cue.
- Favoring brightness contrasts rather than hue contrasts.
- Naming colors out loud when pointing to something ("the green button, on the right").
Possible accommodations
A few simple adjustments are enough to neutralise most of the difficulties linked to colour blindness, with no special equipment.
- At school: a PAP (a personalised support plan, in France) can provide materials where colour is always paired with a word or a symbol, and instructions that never rely on a single shade.
- At work: documents, dashboards and colour codes backed up with a label; for roles where colour perception is central, the RQTH (official recognition as a worker with a disability, in France) opens a dialogue with the MDPH (the French departmental disability office) about useful adaptations.
- In daily life: store and label things by position or by text, use apps that name colours, simply ask for the colour of an object to be spelled out.
Explanations based on your profile
Choose a profile to read the matching explanation.
Colour blindness explained to a Child
0–12 years oldColor blindness is when the eyes see colors a little bit differently. As if you put on special glasses that mix up red and green, for example.
The person sees very well, they can read, play, ride a bike... But sometimes, two colors look very alike to them, like two twins you mix up. Red might look brown, or green a bit yellow.
In everyday life, it can be a little annoying:
- For traffic lights, you have to look at the position of the light (top = red, bottom = green) and not just the color
- A drawing with lots of similar colors can be hard to read
- Sometimes, it's nicer to ask whether the color of an outfit goes well together!
But it's no big deal at all: most color-blind people do everything just like everyone else. It's just a small detail about how their eyes see the world.
Colour blindness explained to a Family caregiver
0–99 years oldColor blindness is seeing colors a little differently, not in black and white, but with some shades getting mixed up, often red and green. The person sees, reads and drives perfectly normally day to day.
What can really raise questions:
- Recognizing a red or green light in certain lighting conditions
- Reading charts or maps coded by color
- Choosing matching clothes (and yes, a hand can be appreciated!)
The key thing to keep in mind: it's a difference in perception, not a disability in the sense of daily hardship. Most activities aren't affected. Your support? Understanding these small visual challenges and, sometimes, offering your eyes for the details where color really matters.
Colour blindness explained to a Preteen
7–12 years oldColor blindness is when someone sees colors differently, most often with red and green. They see, read, drive, but some colors blend together.
In real life, you might notice:
- trouble telling a red light from a green light in certain conditions,
- color charts that are hard to read,
- sometimes, surprising clothing choices.
You can help very simply:
- by avoiding catching them out with "can you see the color there?",
- by also using a word or a symbol when you point out a color.
It's not seeing in black and white: it's seeing a little differently.
Colour blindness explained to a Brother or sister
12–99 years oldYour brother or sister sees colours, but not exactly like you. Most often, it's red and green that mix up or look blurry for them, not because they're blind to colours, but because their eye takes them in differently.
Day to day, what does it change?
- A red light can look yellow or unclear to them depending on the light, but they still know which one it is thanks to the positions of the light.
- A chart with red and green side by side isn't readable for them.
- They may ask you whether two jumpers "go together", not because they can't see anything, but because the contrast isn't clear.
- For everything else (games, reading, going out), it's normal.
Basically: it's not seeing in black and white, it's just that some colour combinations play a game they can't join in the way you can.
Colour blindness explained to a Close friend
12–99 years oldYour friend sees colours, but not exactly like you. It's a bit as if certain shades of red and green looked alike to their eye, or got mixed up. Nothing dramatic: they read, they watch films, they live completely normally.
Day to day, this means:
- A traffic light can be less obvious to read at a glance (but they look at the position of the light)
- A chart with red on green is less clear to them
- Sometimes they ask your opinion on whether two items of clothing go well together
- But otherwise, zero trouble for everything else
The simple thing: if you want to help them, use shapes or patterns in addition to colours, not just colour. And if you ask them what they see, listen to their answer without overwhelming them with explanations. They already know their own situation.
Colour blindness explained to a Teenager
13–17 years oldColor blindness is seeing colors differently. Most of the time, it's red and green that look alike or blend together, not all colors. It's not blindness: you see perfectly, you read, you move around normally.
Day to day, a few situations can be a bit annoying:
- A red light and a green light can look the same in certain lighting (luckily, their position changes too).
- Color charts or maps can be less readable.
- Sometimes, someone asks if your outfit matches.
But that's it: most of your activities happen without any problem. It's just another way of perceiving. And as a classmate or friend, you can always give a hand when the color code really matters. That's what solidarity is.
Colour blindness explained to a Young adult
18–25 years oldColor blindness is a different way of perceiving colors, most often, shades of red and green blend together or become hard to tell apart. The person sees perfectly normally, they navigate most situations without any trouble.
The real thing is when color is the only code used: a traffic light that changes color, a chart where only color sets the data apart, a document where the info comes across only through the color code. That's when it gets complicated.
- Day to day: no real impact on driving, reading, work
- Sometimes a hand to match clothes, or a color map that's not very useful
- What helps: adding symbols, text or patterns on top of color
In short, it's not seeing in black and white, it's just that some contrasts we take for granted don't jump out the same way. Easy to work around once you know.
Colour blindness explained to a Parent
18–99 years oldColor blindness is perceiving colors differently, usually with shades of red and green. Your child sees very well, they read and play without any problem: it's just that some colors look very close to them or get swapped in their eyes.
In everyday life, it can affect them when:
- Traffic lights or color codes are used to convey information (on a chart, a map, an instruction)
- The contrasts between two shades are invisible or confusing to them
- They doubt their color choices when getting dressed
It's a variation, not a failing: most situations cause no trouble at all. You just need to identify together where the color code really matters, and find small, simple adjustments (written labels, occasional help) so everything runs smoothly.
Colour blindness explained to a Teacher
18–99 years oldColor blindness is a different perception of colors, most often red/green. The student sees, reads, plays, but some color-based materials are hard for them to read.
In class, you may observe:
- mistakes on color-based instructions ("underline in green"),
- trouble interpreting a color map or chart,
- sometimes, hidden shame behind a "mistake blamed on a friend."
To make the classroom more inclusive:
- pair color with a symbol, a word, a pattern,
- avoid instructions that rely on color alone.
The child doesn't see poorly: they see differently. A simple classroom convention solves 90% of cases.
Colour blindness explained to a Coworker
18–99 years oldColor blindness is a different perception of colors, most often with red and green. At the office, your color-blind colleague reads, drives and works like everyone else, except with materials based solely on color.
You may observe:
- trouble interpreting a color chart (red/green KPI, map),
- sometimes, a question about a status shown "in red,"
- no effect on the majority of the work.
To make collaboration easier:
- pair color with a symbol or a word in charts,
- don't base a single decision on "look, it's in red."
Inclusive graphics aren't a small detail: they have a real effect on how indicators are read.
Colour blindness explained to a Recruiter or HR
18–99 years oldColor blindness is a different perception of colors, particularly affecting the distinction between certain shades (red-green in particular). The person sees and acts normally in most everyday and professional situations.
The concrete points to consider in recruitment:
- Some roles requiring strict color coding (electrician working on wires, airline pilot) may call for adjustments or support
- For the majority of jobs and tasks, no impact on skills and performance
- A simple adjustment is often enough: backing up color information with text or symbols, intuitive menus, suitable digital tools
Color blindness doesn't determine the ability to work. It's mainly the work environment that can be adjusted in a simple and effective way.
Colour blindness explained to a Spouse or partner
18–99 years oldYour partner sees colours, but differently: red and green especially are tricky for them, they can look alike or become blurry depending on the light. This is nothing like seeing in black and white.
Day to day, this means:
- A red light can be hard to identify quickly (but there's also the position: top, bottom, or middle);
- Charts or tables colour-coded by colour need an extra look;
- For clothes, they may hesitate over certain combinations, a simple opinion helps;
- For everything else, zero trouble.
In practice: adapt colour codes when you can (tables with symbols or numbers too), and be their co-pilot without feeling guilty about the small things. It's a minor difference that gets handled day to day.
Colour blindness explained to a Neighbor
18–99 years oldColour blindness is a slightly different way of seeing certain colours, particularly red and green. The person sees and moves around normally, but some shades escape them or blend together.
Day to day, this can create small difficulties:
- Recognising a red or green light at a glance, especially in certain lighting conditions
- Reading a map or a chart where the colours are essential
- Sometimes hesitating over colours when getting dressed
Important: this is not seeing in black and white. It's just seeing a bit differently in situations where colour is a code. For everything else, no difference at all.
Colour blindness explained to a Activity leader or youth supervisor
18–99 years oldColour blindness is a different way of perceiving colours, usually red and green blending together or going unnoticed. The person sees normally, reads and moves around without trouble, but certain colour contrasts escape them.
In your activities, here is what changes in practice:
- Signs to spot: requests for help reading a chart, map or colour sign; hesitation in front of a colour code (flags, lights, teams); occasional questions about colour choices.
- Including them in the group: use symbols or numbers in addition to colours to mark teams or zones; name the colour out loud when it matters ("red team on the attack"); offer clear visual alternatives.
- Simple adaptations: drawings with black and white contrast; printed documents with patterns in addition to colours; demonstrating on the spot rather than reading out colour-coded instructions.
The good news: this has almost no impact on sports, cultural or leisure activities. A little attention to visual clarity is enough.
Colour blindness explained to a Adult
26–59 years oldColor blindness is a different perception of colors, most often involving red and green. The person sees, reads and drives normally, but some color shades blend together or escape them.
In practical terms, it can create difficulties in situations where color is the main code:
- Telling a red light from a green light depending on lighting conditions
- Reading charts or maps that use only color gradients
- Choosing matching clothes without an outside opinion
The rest of daily life works without any notable trouble. It's not seeing in black and white: it's simply seeing a little differently, particularly where the color code is essential. A few simple adaptations, such as adding symbols to charts or using sharper contrasts, make things much more accessible.
Colour blindness explained to a Manager or line manager
26–59 years oldColor blindness is a different perception of colors, most often red and green blending together. The person sees perfectly, they simply make out certain shades differently.
At work, this can pose a few concrete challenges:
- Charts, tables or color maps can be less readable;
- A color code used as the only way of marking things becomes ineffective;
- Everyday tasks remain entirely accessible.
The adaptations are simple and light: backing up color codes with text or symbols, providing documents in stronger contrast, or using accessible palettes in software tools. These adjustments often benefit everyone on the team.
Colour blindness explained to a Senior
60–99 years oldColor blindness is a different way of perceiving colors, particularly shades of red and green. It's a natural particularity, not an illness: the person sees very well, they don't lose their sight.
Day to day, some situations simply call for a small adjustment:
- Telling traffic lights apart can be less obvious in certain lighting (but the position of the lights helps a lot)
- Charts or maps using color alone can be less clear
- A quick glance to check matching outfits, why not!
- But the vast majority of daily activities happen without any problem
The key thing to keep in mind: it's a difference, not a limitation. With a few simple points of reference, a color-blind person keeps all their independence and remains entirely able to drive, work and live their life to the full.
Living with the Colour blindness: the context set, the conversation freed.
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