Blue Purple Red Green Color Blind Test. Protans have a red green color vision deficiency caused by an anomaly in the red sensitive retinal cone cells. But others have trouble recognizing blue and yellow.
For red blind people and both appear as for green blind people and both appear as this also applies to lighter or darker purple colors. When a doctor performs a color blind test most patients do not recognize the green and red colors. Ishihara test to detect red green colorblind the ishihara test is one of the most common color blind test worldwide.
It is a hereditary disease and occurs more often in men than in women.
For red and green blind people a red purple looks like blue. The test consists of 38 ishihara plates which are colored plates that contains dots of different size and color. Deutans have a red green color vision deficiency caused by an anomaly in the green sensitive retinal. The red green colors are from the color space where the confusion lines are quite the same for both types protan and deutan while the purple blue and purple green colors are quite sensitive to differentiate them.
