Test your color vision with 10 color identification questions. From basic color distinction to fine color difference recognition.
Find the red dot among green dots
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Color vision deficiency is a condition where a person perceives colors differently from those with normal vision. It is caused by abnormalities in the cone cells of the retina, with red-green deficiency being the most common. It affects approximately 8% of men and 0.5% of women, and is more prevalent in males due to X-linked inheritance.
This test is affected by your monitor's color rendering, brightness, and ambient lighting, so it is not a precise diagnostic tool. Use it only as a quick screening reference. For an accurate color vision assessment, consult an ophthalmologist for an Ishihara test or Farnsworth-Munsell 100 Hue test.
Red deficiency (Protanopia/Protanomaly): difficulty perceiving red. Green deficiency (Deuteranopia/Deuteranomaly): difficulty perceiving green. Blue deficiency (Tritanopia/Tritanomaly): difficulty perceiving blue (very rare). Each type is further divided into full absence (color blindness) or reduced function (color weakness) of the relevant cone cells.
There is currently no complete cure for congenital color vision deficiency. However, color correction lenses (such as EnChroma) can improve color discrimination for some individuals. Gene therapy research is ongoing, and acquired color vision deficiency may improve with treatment of the underlying condition (e.g., diabetes, glaucoma).
Set your monitor brightness to 50–70% and test in an environment without direct sunlight. Disable blue-light filters or night mode, and ensure color calibration features are turned off. Testing on an IPS panel monitor with good color accuracy is recommended for best results.
Most people with color vision deficiency live without major difficulties in daily life. However, distinguishing traffic lights, reading maps, and judging food freshness may be challenging. Some occupations (e.g., airline pilot, electrician, chemical analyst) require normal color vision, so it is important to check requirements in advance.
This test is a reference screening test, not a medical diagnostic tool. Results may vary depending on monitor settings and lighting conditions. For accurate color vision testing, please consult an ophthalmologist.
Color vision is the visual ability to distinguish differences in wavelengths of light. The human eye has three types of cone cells that detect red (L-cone), green (M-cone), and blue (S-cone) wavelengths of light respectively. The combination of these three cone types allows us to distinguish over one million colors.
The cause of congenital color vision deficiency is a mutation in cone cell-related genes located on the X chromosome. Men, who have only one X chromosome, will exhibit color vision deficiency if that gene is mutated. Women, however, can be carriers with normal color vision if one of their two X chromosomes is normal. This is why men (approximately 8%) have a much higher incidence than women (approximately 0.5%).
The Ishihara test (石原色覚検査) is a color vision test developed by Professor Shinobu Ishihara of Japan in 1917. Numbers or shapes are hidden within circular patterns (pseudoisochromatic plates) made of colored dots of various sizes to determine color vision deficiency. It remains the most widely used color vision screening tool and is particularly effective at detecting red-green color vision deficiency.
Recent advances in color correction lens technology (e.g., EnChroma) have made it possible to improve the color discrimination ability of some people with color vision deficiency. These lenses selectively block certain wavelengths of light to improve signal separation between cone cells. While not a complete cure, they can significantly improve the color perception experience.