Red Green Colorblind Test

The Cambridge Color Test for ViSaGe provides a rapid means of screening subjects for colour vision deficiencies.

There are the following tests to check color blindness, in which each test has its strategy to detect color vision deficiency.


Our Color Blind Test, with all Color Blind plate tests, are not performance evaluation tools and are only designed to be taken without glasses and any kind of colored lenses. As a result, please take care of following things BEFORE start the test:

  • Remove any glasses with colored lenses if you weared right now. The test is only designed to be taken with the naked eye. It will work only without colored lenses of any type and will lead to accurate results. Taking the online test with color correcting glasses to “prove” that they work is a misconception and inaccurate.
  • Increase your screen brightness to high. Dim light affects color & the ability of perceiving differentiation.

Cambridge Color Test

The Cambridge color blindness test for ViSaGe gives a rapid means of screening subjects for color vision deficiencies. It also examines the changes in color discrimination that occur as a result of congenital or acquired conditions. ( Research Paper)

Investigate the limits of color discrimination

This test allows the investigator to monitor quantitatively over time the progress or remission of the disease. Many drugs addicted people affected with color vision. The pharmacologist will find the test well fitted to monitoring the short-term or long-term side-effects of the blindness.

The test determines discrimination ellipses in color-deficient subjects by probing chromatic sensitivity along the color confusion lines. Generated Ellipses measured in individuals with even slightly anomalous color vision are characteristically orientated and enlarged.

Easy to use

The Cambridge test is easy to use for people with color blindness people or without blindness people. This test uses a familiar Landolt C stimulus, defined by the two test colors that are to be discriminated, on an achromatic background.

The test uses the fixed concept of introducing spatial and luminance noise into the stimulus, composed of grouped circles randomly varying in diameter and having no spatial structure.


Results are saved in ASCII (American Standard Code For Information Interchange) format and presented graphically as discrimination ellipses in CIELUV or CIE(x,y) color space.

The results are typical of a subject with normal color vision; in deficient subjects, the discrimination ellipses are significantly extended in the protan, deutan or Tritan chromaticity directions.

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