Color Blind Test
Ishihara color vision test
What is the Color Blind Test?
The Color Blind Test uses Ishihara-style plates — circles filled with colored dots that contain hidden numbers or patterns visible only to people with normal color vision. It screens for the most common forms of color vision deficiency: red-green color blindness, which affects 8% of males and 0.5% of females.
How to Use
- 1Look at each colored circle plate carefully
- 2Type or select the number you see hidden in the dots
- 3If you cannot see a number, select "I cannot see a number"
- 4Your result indicates normal color vision or a possible color vision deficiency
What is a Good Score?
Correctly identifying all plates indicates normal color vision. Missing several red-green plates suggests red-green color deficiency. This test is a screening tool — see an optometrist for clinical diagnosis.
Tips to Improve
- →Take the test in good natural or neutral white lighting — colored light sources skew the results
- →Do not squint or strain — if you cannot see the number in 5 seconds, you likely have a deficiency for that plate
- →View the screen at normal distance (50–75cm) and avoid tilting
Frequently Asked Questions
How accurate is this color blind test?
Ishihara-based online tests provide a reasonable screening result but cannot replace a clinical test. Factors like screen calibration, ambient lighting, and viewing distance affect accuracy.
What percentage of people are color blind?
Approximately 8% of males and 0.5% of females have some form of color vision deficiency. Red-green color blindness is the most common form, affecting about 1 in 12 men.
Can color blindness be treated?
There is no cure for inherited color blindness, but special glasses and contact lenses (like EnChroma) enhance color contrast for some types. Gene therapy is being researched for certain forms.