Color Perception Test (Ishihara)
Take an interactive color blindness test with 14 Ishihara-style plates. Each plate contains a number hidden in colored dots that tests different aspects of your color vision. Identify the numbers you see, get an overall score, and receive a detailed breakdown across red-green deficiency, blue-yellow deficiency, and control categories. All plates are generated in your browser using Canvas API - nothing is uploaded. Fully private, 100% free, and no signup required.
Color Perception Test
This interactive test uses Ishihara-style color plates to help you understand your color vision. You will be shown 14 plates with numbers hidden in colored dots. Enter the number you see in each plate.
Look at each plate and identify the number you see in the colored dots
Type the number you see (or leave blank if you see no number)
Review your results and interpretation at the end
This test is for educational purposes only and is not a substitute for a professional color vision evaluation by an eye care professional.
Why Use Our Color Perception Test?
Interactive Ishihara-Style Test
Take a complete color perception test with 14 Ishihara-style plates generated dynamically using Canvas API. Each plate tests a different aspect of color vision - from control plates visible to everyone, through red-green deficiency tests, to blue-yellow (tritanopia) detection plates.
Comprehensive Results & Analysis
Receive a detailed breakdown of your performance across different plate types - control, red-green deficiency, differentiation, and blue-yellow tests. Get an overall score and a personalized interpretation explaining what your responses suggest about your color vision.
100% Private - No Upload
All plate generation, answer processing, and scoring happens entirely in your browser using Canvas API. No images, no answers, and no test results are ever uploaded to any server. Your privacy is completely protected.
Free & No Signup
Take the color perception test unlimited times with no signup, no subscription, and no usage caps. The test is completely free forever with no ads blocking the interface. Each test generates fresh plates for a unique experience.
Common Use Cases for Color Perception Test
Educational Self-Assessment
Students and curious individuals use the Color Perception Test to learn about color vision deficiencies and how Ishihara plates work. The test provides an educational, hands-on way to understand the science behind color blindness testing and how different types of color deficiency affect perception.
Pre-Employment Screening
Individuals applying for roles that require accurate color discrimination - such as electricians, pilots, graphic designers, and laboratory technicians - use the Color Perception Test as a preliminary self-assessment before undergoing formal occupational screening.
Designing for Color Accessibility
Web and product designers use the Color Perception Test to better understand the experience of users with color vision deficiencies. By taking the test themselves, designers gain empathy and awareness that informs more inclusive design decisions.
Understanding Personal Color Vision
Individuals who suspect they may have color vision deficiency use the Color Perception Test as a convenient initial screening tool. The results help them understand which types of colors they may have difficulty distinguishing before seeking professional evaluation.
Digital Accessibility Awareness
UX researchers and accessibility advocates use the Color Perception Test during workshops and training sessions to demonstrate color blindness to teams. The interactive format helps sighted team members understand why color-coded interfaces can be problematic.
Family & Community Education
Parents, teachers, and community health educators use the Color Perception Test as an educational tool to introduce color vision concepts. It serves as a starting point for discussions about vision health, genetic inheritance of color blindness, and visual diversity.
Understanding the Color Perception Test
What is the Ishihara Color Perception Test?
The Ishihara color perception testis the most widely used screening test for color vision deficiency. Developed by Dr. Shinobu Ishihara, a Japanese ophthalmologist, in 1917, the test uses special plates called “Ishihara plates” - circular arrangements of colored dots (often called pseudoisochromatic plates). Each plate contains a number or pattern embedded in dots of different colors. People with normal color vision can see the number clearly, while those with color vision deficiencies may see a different number or nothing at all.
How Our Color Perception Test Works
- Plates are generated in your browser: Each Ishihara-style plate is created dynamically using the Canvas API on your device. The plate consists of a circle filled with small colored dots arranged in a random pattern. A number is embedded using dots of a different color family - for example, red dots forming a number against a green dot background. The number is invisible in the source code and only revealed through the visual pattern.
- You identify the number:For each plate, type the number you see in the input field. If you see no number, you can leave it blank. After submitting your answer, the correct answer is revealed so you can learn from each plate. Press “Next Plate” to continue through all 14 plates.
- Get your results: After completing all plates, you receive a detailed score breakdown by plate type (control, red-green deficiency, differentiation, blue-yellow deficiency), an overall percentage score, and a personalized interpretation of what your responses suggest about your color vision.
Types of Color Vision Deficiency
- Protanopia: Reduced sensitivity to red light due to lack of long-wavelength (L) cone cells in the retina. Affects approximately 1.3% of males. Red hues appear darker and can be confused with greens and browns.
- Deuteranopia: Reduced sensitivity to green light due to lack of medium-wavelength (M) cone cells. The most common form, affecting approximately 1.2% of males. Greens and reds appear similar, making it hard to distinguish these colors.
- Tritanopia: Reduced sensitivity to blue light due to lack of short-wavelength (S) cone cells. Very rare, affecting less than 0.01% of the population equally across genders. Blue and green appear similar, as do yellow and red.
- Anomalous Trichromacy: The milder form of color deficiency where all three cone types are present but one type has reduced sensitivity. Protanomaly, deuteranomaly, and tritanomaly are the milder counterparts of the dichromatic conditions above.
Important Medical Disclaimer
This online color perception test is provided for educational and informational purposes only. It is not a medical diagnostic tool and should not be used as a substitute for professional medical advice, diagnosis, or treatment. The generated plates and scoring algorithm are a digital approximation of the standardized Ishihara test and may not accurately reflect your true color vision status due to display variations, lighting conditions, and technical limitations.
If you have concerns about your color vision, we strongly recommend consulting a qualified eye care professional who can administer a standardized color vision test using controlled testing materials and conditions. Color vision deficiency affects approximately 8% of males and 0.5% of females worldwide, and most people with color blindness lead full, normal lives with minor accommodations.
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Frequently Asked Questions About Color Perception Test
The Color Perception Test is an interactive online tool that uses Ishihara-style color plates to help you understand your color vision. The classic Ishihara test was developed by Dr. Shinobu Ishihara in 1917 and uses plates filled with colored dots hiding numbers that are differently visible depending on your type of color vision. Our digital version generates these plates dynamically using the Canvas API and tests for common types of color vision deficiency including protanopia, deuteranopia, and tritanopia.
This test is designed for educational and informational purposes. While it uses the same principles as traditional Ishihara testing, the accuracy depends on your screen calibration, display quality, lighting conditions, and the inherent limitations of digital color reproduction. It can provide a useful indication of color vision status, but it should not be considered a definitive diagnosis. For a formal diagnosis, always consult an eye care professional with standardized testing materials.
The test includes plates designed to detect protanopia (reduced sensitivity to red light), deuteranopia (reduced sensitivity to green light), and tritanopia (reduced sensitivity to blue light). It also includes control plates that should be visible to everyone and differentiation plates that help distinguish between protanopia and deuteranopia. The results section provides a breakdown of your performance across each type.
Yes, absolutely. The Color Perception Test runs entirely in your browser using the Canvas API to generate all plates on your device. None of your answers, test results, or generated plate images are ever sent to any server. Everything remains on your device and is cleared when you close the page or start a new test.
The test includes 14 Ishihara-style plates. Each plate is generated dynamically using the Canvas API, creating a unique dot pattern every time you take the test. The plates are organized into categories: control plates that test basic visibility, red-green deficiency detection plates, protanopia vs deuteranopia differentiation plates, and blue-yellow (tritanopia) detection plates.
If your results suggest a color vision deficiency, we recommend consulting an eye care professional for a comprehensive color vision evaluation using standardized testing materials. They can provide a formal diagnosis, help you understand how color vision affects your daily life, and suggest accommodations if needed. Many people with color vision deficiencies lead completely normal lives with minor adjustments.
Yes. The Color Perception Test is 100% free with no signup required, no premium features, and no usage limits. Take the test as many times as you like without any restrictions or hidden costs. There are no ads blocking the interface.
For the most accurate results, we recommend taking the test without any color vision correction aids, as the test is designed to assess your natural color perception. If you typically use color-blind glasses or other aids, consider taking the test both with and without them to understand how they affect your color perception. The educational purpose of the test is to help you understand your baseline color vision.