Color Blindness Test Online
Screen for color vision deficiency with Ishihara-style dot plates. Tests for protan (red), deutan (green), and tritan (blue) types.
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Frequently Asked Questions
How does the Color Blindness Test work?
The tool renders Ishihara-style pseudoisochromatic plates on an HTML Canvas. Each plate is a circle filled with dots of varying sizes, where a number or shape is formed by dots in colors that people with normal vision can distinguish but color-deficient viewers cannot. The dot colors are calibrated to specific confusion lines for protan (red), deutan (green), and tritan (blue) deficiencies. Your responses are compared against expected answers to determine which type, if any, is indicated.
How accurate is this test?
This is a screening tool using Ishihara-style plates, which is the same method used in clinical settings. It can indicate the presence and type of color vision deficiency, but a definitive diagnosis requires a professional eye examination.
What types of color blindness does it detect?
Protan (red weakness), deutan (green weakness), and tritan (blue weakness). Protan and deutan are the most common types, affecting approximately 8% of men and 0.5% of women.
Can color blindness be fixed?
Color vision deficiency is usually genetic and has no cure. Special glasses (like EnChroma) can enhance color perception for some people but do not restore normal color vision. The test helps you understand your specific type.