Free Color Blind Test

What is Color Blindness?

Color blindness (color vision deficiency) is a condition where you cannot distinguish certain colors or perceive them differently from most people. It is not actually "blindness" in the traditional sense — the vast majority of people with color vision deficiency can see colors, but they confuse certain shades that appear distinct to people with normal color vision. The most common type is red-green color blindness, affecting about 8% of men and 0.5% of women of Northern European descent. Learn about the different forms of color vision deficiency in our article on types of color blindness.

How Color Vision Works

Human color vision depends on three types of cone cells in the retina, each sensitive to different wavelengths of light: short-wavelength (blue), medium-wavelength (green), and long-wavelength (red). The brain combines signals from all three cone types to create the full spectrum of color we perceive. When one or more cone types are absent, reduced in number, or respond to a shifted wavelength, color vision deficiency results.

For more information about the science of color vision, the National Eye Institute provides comprehensive resources on color blindness causes, symptoms, and research.

Types of Color Vision Deficiency

Color blindness is classified based on which cone type is affected:

• Protanopia / Protanomaly — Affects the red (long-wavelength) cones. People with protanopia have no functioning red cones; those with protanomaly have red cones with shifted sensitivity. Reds may appear as dark browns or greens, and it can be difficult to distinguish red from green, or red from black.
• Deuteranopia / Deuteranomaly — Affects the green (medium-wavelength) cones. This is the most common form of color blindness. Greens may shift toward reds, and distinguishing green from red or green from brown becomes challenging. Deuteranomaly alone accounts for about 5% of males.
• Tritanopia / Tritanomaly — Affects the blue (short-wavelength) cones. This rare form makes it difficult to distinguish blue from green and yellow from violet. Unlike red-green deficiency, tritanopia is not X-linked and affects males and females equally.
• Achromatopsia — Complete absence of color vision (rod monochromacy). People with this extremely rare condition (about 1 in 30,000) see the world in shades of gray and are often extremely sensitive to light.

Prevalence and Genetics

Color blindness is predominantly a genetic condition inherited through the X chromosome. Because males have only one X chromosome (XY), a single copy of the gene variant causes color blindness. Females have two X chromosomes (XX), so they need the variant on both copies to be affected — making them much less likely to be color blind but more likely to be carriers. Approximately 15% of women carry a gene for red-green color blindness without experiencing symptoms themselves.

While most color vision deficiency is genetic and present from birth, it can also be acquired later in life through eye diseases (such as glaucoma or macular degeneration), certain medications, chemical exposure, or aging. Acquired color vision deficiency may affect one or both eyes and can sometimes be treated by addressing the underlying cause.

Impact on Daily Life

Most people with color vision deficiency adapt well to daily life, but certain situations can pose challenges:

• Traffic signals — Distinguishing red from green lights. Most people learn to rely on position (top vs. bottom) rather than color alone.
• Cooking — Judging whether meat is cooked (red vs. brown) or whether fruit is ripe can be difficult.
• Clothing — Matching outfit colors without realizing certain combinations clash or appear different than intended.
• Education — Color-coded charts, maps, and graphs can be hard to read if not designed with accessibility in mind.
• Careers — Some professions require normal color vision, including commercial aviation, certain military roles, and electrical work where wire colors indicate different functions.

Accommodations and Tools

Many accommodations exist to help people with color vision deficiency:

• Color-correcting glasses — Products like EnChroma and Pilestone use optical filters to enhance the separation between red and green wavelengths, improving color discrimination for many (though not all) types of red-green deficiency.
• Accessible design — Web and app developers can use colorblind-friendly palettes, add patterns or labels alongside color coding, and follow WCAG accessibility guidelines.
• Smartphone apps — Color identifier apps use the camera to name colors in real time, helping with tasks like matching clothes or reading color-coded information.
• Display settings — Most modern operating systems include colorblind display modes that shift colors to ranges more easily distinguished by people with color vision deficiency.

FAQ

Is this test accurate?

This test provides a rough screening. Computer screens cannot perfectly replicate the calibrated colors of clinical Ishihara plates. Display settings, brightness, and ambient lighting all affect results. For an accurate diagnosis, visit an eye care professional who can use standardized clinical equipment.

Can color blindness be treated?

Color vision deficiency is usually genetic and cannot be cured. However, special glasses (such as EnChroma) and contact lenses can enhance color perception for some types of color blindness. Gene therapy research is ongoing but not yet available as a standard treatment.

What are the main types of color blindness?

The three main types are protanopia (red blindness), deuteranopia (green blindness), and tritanopia (blue-yellow blindness). Red-green color blindness (protanopia and deuteranopia combined) accounts for about 99% of all cases. Complete color blindness (achromatopsia) is extremely rare, affecting roughly 1 in 30,000 people.

How common is color blindness?

Approximately 8% of males and 0.5% of females of Northern European descent have some form of color vision deficiency. It is less common in other populations. The condition is more prevalent in males because the most common forms are linked to genes on the X chromosome.

Can color blindness affect my career?

Some careers have color vision requirements, including commercial airline pilots, electricians, certain military roles, and some law enforcement positions. However, most jobs can be performed effectively with color vision deficiency, and many industries now use accessible design practices to accommodate color blind individuals.