Red-Green Color Blind Test
A focused 9-plate Ishihara screen with classification plates — it not only screens for red-green deficiency but also indicates whether your answers match a protan (red-type) or deutan (green-type) pattern. About 2 minutes, free, no signup.
Educational screening only; not a medical diagnosis.
Take the Red-Green Test
9 plates · protan/deutan classification · instant results
What is red-green color blindness?
Red-green color vision deficiency is the most common type, affecting roughly 8% of men and 0.5% of women, usually inherited. It splits into protan (anomalous red cones) and deutan (anomalous green cones) types, each ranging from mild (-anomaly) to complete (-anopia).
How does this test tell protan from deutan?
It includes the two standard classification plates (26 and 42). People with red-green deficiencies typically see only one digit on each: a protan tendency reads 6 and 2, a deutan tendency reads 2 and 4. Your result reflects which pattern your answers match. This is an indication only — definitive typing requires an anomaloscope exam.
Frequently asked questions
What is the difference between protan and deutan?
Protan-type deficiency means reduced sensitivity to red light (reds look darker); deutan-type means reduced sensitivity to green light. Both cause red-green confusion; deutan is the more common type. The classification plates in this test indicate which tendency your answers match.
How is this different from the full test on the homepage?
The full test uses 17 plates including vanishing and hidden designs. This page is a focused 9-plate red-green screen that keeps the two classification plates for protan/deutan typing, so it is faster.
How accurate is it?
This is an educational screening, not a medical diagnosis. Screen quality, lighting, and viewing distance all affect results. For confirmation, see an eye-care professional for tests such as an anomaloscope.
Want a more thorough screen? Take the full 17-plate test on the homepage, or browse our learning hub.