Online Ishihara Test for Color Blindness
This online Ishihara color blindness test is a simple method to diagnose the existence of red-green deficiency. Red-green deficiency means having problems distinguishing reds and greens and is by far the most common form of color vision deficiency.
This test was originally designed by Dr Shinobu Ishihara in 1917 and this tool has all 38 Ishihara plates. Each plate contains a circle of dots appearing randomized in color and size. Within the pattern are dots which form a number or a colored line visible to those with normal color vision and invisible, or difficult to see, for those with a red-green color vision defect.
To pass each test you must identify the hidden number or line. At any time you can reveal the answer and at the end of the test you will see the test results.
If you suffer from red-blindness (protanopia), you are unable to see the color red. If you suffer from green-blindness (deuteranopia), you are unable to see the color green.
If you suffer from red-weakness (protanomaly), you will have some difficulty to see the color red. If you suffer from green-weakness (deuteranomaly), you will have some difficulty to see the color green.
Instruction
Plates 1 – 25 each contain a number, plates 26 – 38 contain one or two wiggly lines. To pass each test you must identify the correct number, or correctly trace the wiggly lines.
- Sit approximately 75cm from your monitor, with each circle set at eye level.
- Preferably have mild natural light and no glare on your screen. Interior lights and glare can alter the color of the pictures.
- Attempt to identify the hidden number or line within 5 seconds and select an answer, then click on the image (left mouse button).
- Upon left clicking, the answer will be revealed along with an analysis explaining your condition if you got it wrong.
- Continue to the next Ishihara test, Complete them all to help gauge your color blindness severity.
- The result of the test will be shown after completion of the test.
Notes:
- After an answer is selected for each plate, you can toggle back and forth between the original plate and the answer by clicking on the plate itself.
- This test cannot guarantee complete accuracy. Your monitor and quality loss of online images may affect the original colors used. Should these tests suggest that you may be color blind, you should seek professional confirmation.