Color vision blog
Guides on color blindness
Choose a sourced guide to color blindness: driving, testing, types, or everyday life.
The Trichromatic Theory of Color Vision, Explained
The trichromatic (Young-Helmholtz) theory says all human color vision starts with three cone types. What the theory claims, the evidence that confirmed it, what it explains — and the color phenomena it can't explain alone.
Read moreThe Opponent-Process Theory of Color Vision, Explained
Hering's opponent-process theory says color is coded as red-versus-green and blue-versus-yellow rivalries. The afterimage evidence, the neurons that proved it, and why it explains what color blindness feels like from inside.
Read moreMario Kart and Color Blindness: No Colorblind Mode, But Real Workarounds
Neither Mario Kart 8 Deluxe nor Mario Kart World ships a colorblind mode. But Nintendo quietly built one non-color cue into the shells two decades ago — and colorblind players have worked out the rest. What actually helps, item by item.
Read moreHow to Describe a Color to a Blind Person
Describing colour to someone who has never seen it works through the senses they do have — temperature, texture, sound, emotion and association. What actually lands, and what to avoid.
Read moreCelebrities with Color Blindness (and the Lists That Get It Wrong)
Which famous people have actually said they are colour blind, why most celebrity lists are unreliable, and what their careers show about living with colour vision deficiency.
Read more12 Genuinely Interesting Facts About Color Blindness
Bulls are not angered by red, most colour blind people see plenty of colour, and some women may have four cone types. Twelve facts about colour vision deficiency that hold up when you check them.
Read moreColorblind Modes in Games: What They Do and When They Don't Help
What a colourblind mode in a video game actually changes, why some are far better than others, which board games are hardest, and what to do when a game has no accessibility option at all.
Read moreRed-Green Color Blindness: Protan, Deutan & What You Confuse
Red-green color blindness explained — what colors you confuse, protan vs deutan, why it's more common in men, whether glasses help, and how it's tested. Affects about 1 in 12 men, with sources.
Read moreFree Color Blind Test — Take the EnChroma-Style Screening Online
Looking for the EnChroma test? Take a free online color blind test that screens for a red-green deficiency and estimates your type and degree in two minutes — no email, no purchase, plus how online tests compare.
Read moreProtan vs Deutan: The Difference Between the Two Red-Green Types
Protan vs deutan explained — protan affects the red cone and makes reds look darker; deutan affects the green cone and keeps normal brightness. Side-by-side comparison and how to tell which you are.
Read moreBlue-Yellow Color Blindness (Tritan): Tritanomaly & Tritanopia
Blue-yellow color blindness (tritan) explained — what it confuses, tritanomaly vs tritanopia, why it affects men and women equally, and how it's tested. Rare, often acquired, with sources.
Read moreCan Women Be Color Blind?
Yes — about 1 in 200 women has a red-green deficiency versus 1 in 12 men. The X-linked genetics, what a carrier is, and why women are often undiagnosed, with sources.
Read moreAre Dogs Color Blind? What Dogs (and Cats) Actually See
Dogs aren't fully color blind — they have two cone types and see the world a bit like a red-green color blind person: blues and yellows yes, reds and greens no. What dogs and cats see, and why a red toy on green grass can disappear for them.
Read moreJobs That Require a Color Vision Test
Role-by-role guide to color-vision job requirements — pilot, seafarer, army, police, train driver and more — and whether you can qualify color blind, with official sources.
Read moreReverse Color Blind Test: Is the 'Backwards' Test Real?
The reverse (backwards) color blind test shows a number color-blind people can see and others can't. The hidden-digit plates are real, but most viral versions are fake — how to tell, and a real test to take.
Read moreCan Girls Be Color Blind?
Yes, girls can be color blind, but it is far rarer than in boys: about 1 in 200 women have red-green color blindness versus 1 in 12 men. Why the X chromosome causes that gap, what carriers pass on, and the types that hit both sexes equally.
Read moreDo Color Blind Glasses Work?
Color blind glasses help some people with mild to moderate red-green color blindness see certain colors as more distinct, but they do not cure it, add missing colors, or help you pass a color vision test. Who they help, who they don't, and what to expect.
Read moreColor Vision Test Practice: Plates, Charts, and PDFs
How to practice for a color vision test: where the Ishihara plates and charts come from, why memorizing a PDF answer key doesn't help, and a free way to practice with fresh plates each time.
Read moreCan Color Blindness Be Cured?
Inherited color blindness can't be cured yet — it's built into your genes. What actually helps (glasses, apps, habits), where gene-therapy research stands, and why some acquired color vision changes are reversible.
Read moreWhat Do Color Blind People See?
Color blind people don't see in grey — most see a narrower range of color, with certain pairs looking alike. What each type sees, the colors that get confused, and what total color blindness really looks like.
Read moreTypes of Color Blindness
The types of color blindness explained — red-green (protan/deutan), blue-yellow (tritan), and complete color blindness — what each confuses and how common it is, with sources.
Read moreCan You Get a Driver's License If You're Color Blind?
Country-by-country guide to the color-vision requirements for a driver's license, with official sources. In most countries, color blindness does not stop you driving.
Read moreHow Color-Blind Drivers Read Traffic Lights
Color-blind drivers read traffic lights by position more than by color, which is why most drive safely. How that works, where it gets harder, and whether you need to tell the licensing authority.
Read moreHow Color Blindness Works: The Science of Color Vision
How color blindness works, from the eye's three cone types to the brain's red-green and blue-yellow channels: why deficiencies come in two families, and how a test reads type and severity from them. Plain-English and sourced.
Read moreMore guides are on the way. Everything here is informational and regularly reviewed — it is not a substitute for advice from an eye-care professional.