Color blind people see white

How color blind people see the world

There are four types of color blindness in total. About eight percent of men in Austria and Germany are affected by red-green visual impairment (protanopia or deuteranopia), 0.4 percent of women. In comparison, blue blindness is very rare with a prevalence of 0.005 percent. Complete color blindness, in which only "light-dark" contrasts can be perceived (achromatism), occurs in around five percent of the population.

Around 300 million people around the world see the world in different colors. How exactly is shown by the non-profit organization Color Blind Awareness in cooperation with the contact lens manufacturer Lenstore. In total, over 30 photos of places and sights were processed with special software in order to bring normal sighted people closer to the "color-blind" world.

The red-green poor eyesight protanopia

Typical of protanopia is the lack of L-cones in the retina, which are responsible for processing long-wave light. The light that excites the L-cones is mainly in the red spectrum. Protanopes therefore have difficulty distinguishing between red and green and blue and green.

Deuteranopia, the red-green visual impairment

In deuteranopia, the so-called M-cones are missing, which mainly react to light in the green color range. It is more difficult for deuteranopes to distinguish green from red and blue. Besides protanopia, this is the most common type of color blindness.

The blue blindness tritanopia

Tritanopia is characterized by the lack of the K cones, which are responsible for processing short-wave light. K-cones are mainly excited by light in the blue color range. Tritanopes have difficulty distinguishing between blue and yellow hues. Green is often confused with blue and purple with black. (red, December 17, 2018)