A color blind test is a device your opthalmist uses to determine if you have a color vision deficiency, commonly known as colour blindness.
There are two different types of tests to determine colour blindness. Screening tests that can detect the presence of a color vision problem, and also more detailed quantitative tests that will be able to detect a color vision deficiency and determine the type and severity of color blindness.
This is important if you are considering a change in career that may rely heavily on your colour perception for example electricians, commercial artists, designers and technicians, and some specific manufacturing and marketing personnel.
The effect color blindness has on individual job performance depends in large part on the color-related requirements of the position and the severity of the person's color vision deficiency.
In many cases, fears about being handicapped by color blindness are unwarranted. Because the condition is present at birth, most colorblind people are unaware of their color vision deficiency and do not find that it interferes significantly with day to day life.
Though there is no treatment for color blindness, in some cases specially tinted contacts can help to improve a colorblind person's ability to perceive the differences between certain colors.
There are many color blind tests online. These almost always are variations of the Ishihara screening test and are presented in varying degrees of quality.
Because exact color representation is essential for the accuracy of any color blind test, results from online color vision screening tests are suspect. For the best results you should always see your eye doctor and take a color blind test administered by a trained professional using standardized testing materials under proper lighting.