Color vision blog
Guides on color blindness
Choose a sourced guide to color blindness: driving, testing, types, or everyday life.
Protan Color Blindness
Protanomaly, protanopia and what online mild or strong result labels mean.
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 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 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 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. Where it gets harder, and what the rules say.
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, and how a test reads type and severity.
Read moreCan Girls Be Color Blind?
Yes, girls can be color blind, but it is rare: about 1 in 200 women versus 1 in 12 men. Why the X chromosome causes the gap and what carriers pass on.
Read moreDo Color Blind Glasses Work?
Color blind glasses help some people with mild red-green deficiency tell colors apart, but they don't cure it or help you pass a test. Who they help.
Read moreColor Vision Test Practice: Plates, Charts, and PDFs
How to practice for a color vision test: where Ishihara plates come from, why memorizing an answer key fails, and a free way to drill fresh plates.
Read moreCan Color Blindness Be Cured?
Inherited color blindness can't be cured yet. What actually helps (glasses, apps, habits), where gene therapy stands, and which acquired cases fade.
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 and which colors blur.
Read moreAre Dogs Color Blind? What Dogs (and Cats) Actually See
Dogs aren't fully color blind. With two cone types they see blues and yellows but not reds and greens, like a red-green color blind person. Cats too.
Read moreHow to Describe a Color to a Blind Person
Describing color to someone who has never seen it works through temperature, texture, sound, emotion and association. What 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 color blind, why most celebrity lists are unreliable, and what their careers show about the condition.
Read more12 Genuinely Interesting Facts About Color Blindness
Bulls aren't angered by red, most color blind people see plenty of color, and some women may have four cone types. Twelve facts that survive a check.
Read moreColorblind Modes in Games: What They Do and When They Don't Help
What a colorblind mode in a video game actually changes, why some work far better than others, and what to do when a game has no accessibility option.
Read moreThe Trichromatic Theory of Color Vision, Explained
The trichromatic (Young-Helmholtz) theory says human color vision starts with three cone types. What it claims, the evidence, and what it can't cover.
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 and the neurons.
Read moreMario Kart and Color Blindness: No Colorblind Mode, But Real Workarounds
Mario Kart 8 Deluxe and Mario Kart World have no colorblind mode, but Nintendo built one non-color cue into the shells. What helps, item by item.
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 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 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 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 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 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 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.