Sight Test - Ishihara Charts - Color Blindness calculator
Use the Ishihara test to check if you suffer from color blindness, to what extent your defect is Protanopia or Deuteranopia, or maybe just insufficient differentiation between red and green shades. As a result, in addition to the diagnosis, you will have the opportunity to check how each of the Ishihara plates is seen by people with various visual impairments, and if you have a defect, they will allow you to see what is on the plates.
The Ishihara test consists of 38 plates. Each board consists of a circle formed by round spots of various sizes, slightly different in color. The choice of colors on each chart is different, which makes it possible to diagnose various color vision disorders. The test is designed to detect the two most common types of color blindness:
Protanopia or a sight defect consisting in not recognizing the color red or confusing it with the color green, and
Deuteranopia or a defect, a type of color blindness, consisting in not recognizing the green color or confusing it with red.
Tritanopia (blue color blindness) is not included in this test as it is very rare. There are also really few people who can't see any color (i.e. they see every color as gray).
The most common color blindness is a shift between red and green caused by a lack of perception of one or both of these colors. We all have a different perception of these colors to varying degrees. When it is mild, protanopia is called " protanomalia " and deuteranopia is called " deuteranomalia ". This test is intended to diagnose only the most extreme cases ("nopias"), but may give you clues to subtle anomalies (note if you see some plates more intensely than others).
Under each Ishihara board, you'll see buttons with different options. Choose the one that best matches what you see on the board. If you don't know what to choose, choose "I don't know". Some images may be ambiguous, so choose instinctively without thinking too much. Speed of reaction is important because seeing colors requires no thought and why deceive yourself.