What Is a Color Blindness Test?
A color blindness test screens for color vision deficiencies — conditions where certain colors are difficult to distinguish. The most widely used method is the Ishihara test, which presents circles filled with colored dots. Hidden within these dots are numbers that people with normal color vision can identify, but those with color deficiencies may struggle to see.
Types of Color Vision Deficiency
Red-Green Deficiency
Most Common
Difficulty distinguishing between red, green, brown, and orange hues. Includes:
- Protanopia — Reduced red sensitivity
- Deuteranopia — Reduced green sensitivity
Blue-Yellow Deficiency
Rare
Affects less than 0.01% of the population. Difficulty distinguishing between blue and yellow hues.
- Tritanopia/Tritanomaly — Reduced blue sensitivity
How This Test Works
This screening presents 10 Ishihara-style dot plates. Each plate contains a hidden single-digit number formed by colored dots against a differently colored dot background.
View Plates
Examine each colored dot pattern carefully
Identify Numbers
Select the hidden number you see (0-9)
Get Results
Receive detailed analysis of your color vision
Your responses are scored and analyzed to determine if your color vision falls within the normal range or suggests a possible deficiency.
How to Use the Test
Before You Begin
- Sit approximately 75 cm (30 inches) from your screen
- Adjust your screen to a comfortable brightness — avoid glare or direct sunlight
- Remove any tinted glasses or color-filtering lenses
- Ensure your display color settings are not altered by night mode or color filters
Taking the Test
Read Instructions
Review the welcome screen instructions, then click "Start Test" to begin
View Each Plate
Look carefully for a number hidden within the colored dots. Take your time examining each pattern
Select Your Answer
Use the numpad (0-9) to select the number you see. If you cannot identify a number, select "I can't see a number"
Progress Through Plates
The test automatically advances to the next plate after you answer. Use the Previous button to go back and change earlier answers if needed
View Results
After completing all 10 plates, your results are displayed with a detailed score breakdown and analysis
Understanding Your Results
Your test results include three key performance metrics:
Total Score
Red-Green Score
Blue-Yellow Score
The test classifies your result as normal vision or indicates a possible deficiency type based on which plate categories you had difficulty with.
Features
Ishihara-Style Dot Plates
10 carefully designed dot plates that simulate the classic Ishihara color vision test. Each plate features densely packed colored dots with a hidden single-digit number visible through hue contrast.
- 1 demonstration plate (visible to everyone)
- 7 red-green screening plates
- 2 blue-yellow screening plates
Comprehensive Screening
Tests for the two main categories of color vision deficiency with specialized plate designs.
- Red-Green (Protan-Deutan) — Distinguishing red/orange from green hues
- Blue-Yellow (Tritan) — Distinguishing blue from yellow hues
- Demonstration plate confirms test understanding
Intuitive Answer Selection
Quick and easy numpad interface for seamless test experience.
- Numpad grid (0-9) for number selection
- "I can't see a number" option available
- Automatic advancement after each answer
- Smooth and fast user experience
Detailed Results
Comprehensive analysis of your color vision performance with educational insights.
- Total score and category breakdowns
- Separate red-green and blue-yellow scores
- Per-plate result details
- Educational explanation of findings
Frequently Asked Questions
Is this test accurate?
This is a screening tool based on the Ishihara method, which is the gold standard for detecting color vision deficiencies. However, it is not a replacement for a clinical examination.
If the test suggests a deficiency, consult an eye care professional for a comprehensive evaluation.
Can color blindness be cured?
Most color vision deficiencies are genetic and permanent. There is currently no cure for inherited color blindness.
Inherited Deficiency
- Permanent condition
- No cure available
- Special glasses may help
- Contact lenses can enhance colors
Acquired Changes
- From medications or disease
- May be reversible
- Treat underlying cause
- Consult healthcare provider
Why can I see the first plate but not others?
The first plate is a demonstration plate designed to be visible to everyone, including those with color deficiencies. It confirms you understand the test format.
The remaining plates use specific color combinations that become invisible or unclear to people with particular types of color vision deficiency. This is intentional and helps identify which type of deficiency may be present.
Does my screen affect the results?
Yes. Screen brightness, color temperature, and display quality can significantly influence how the dot plates appear.
- Use a well-calibrated monitor
- Set comfortable brightness level
- Disable night mode or blue light filters
- Avoid viewing in direct sunlight or glare
- Ensure color settings are at default values
Can I retake the test?
Yes. Click "Retake Test" on the results screen to return to the welcome page and start again.
Each time you retake the test, the dot plates are regenerated with fresh random patterns while maintaining the same color properties and hidden numbers. This ensures consistent testing while preventing memorization.
What do the different deficiency types mean?
Protan Type
Protanopia/Protanomaly
Reduced sensitivity to red light. Reds may appear darker or brownish.
Deutan Type
Deuteranopia/Deuteranomaly
Reduced sensitivity to green light. The most common form of color blindness.
Tritan Type
Tritanopia/Tritanomaly
Reduced sensitivity to blue light. Very rare, affecting blue-yellow distinction.
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