Color blindness, also called color vision deficiency, refers to a lack of sensitivity to particular colors. People who are color blind can see colors, but they cannot differentiate between certain colors. Most people who are considered color blind cannot see the difference between green and red. The Ishihara Plates, developed by a Japanese ophthalmologist, is the most common color blindness test used today.
Things You'll Need
- Ishihara Plates or similar eye test
Take an online color blindness test to find a preliminary diagnosis for color blindness. The full Ishihara Plates are not displayed free of charge on the Internet, but you can take a modified version of the test by clicking on the first link under Resources at the bottom of this page.
Look at each circle filled with colored dots on that test. Look for a number inside of each circle. Then compare your answers to the correct answers at the bottom of the test. This test is for red/green color blindness. To pass the test, you must recognize the two-digit number in every circle of the test.
Another color blindness test is the Farnsworth D-15 test, which requires you to arrange dots in order according to color. The D-15 test determines the severity of color blindness. You can take a version of the test online by clicking on the D-15 link under Resources at the bottom of this page. You still should take a color blindness test in person with an eye doctor for an accurate diagnosis if you think you may be color blind.
If you failed the test noted in Step 1, meaning you could see only dots when you should have seen a number, schedule an appointment with your eye doctor to take a full test and receive a complete diagnosis. The full Ishihara Plates test contains 24 questions.
Tips & Warnings
- The Ishihara test is meant to be taken in person and not on a computer. A computer screen could distort some of the colors on the test and should not replace an in-person test.
The History of Colorblindness
The term "colorblindness" (or "color blindness") is incorrect in most cases, according to the website Colour Blindness and Medicine. Most people who...
How to Test for Color Blindness
Color blindness is a condition that affects more men than women, and it does not mean that the person can only see...