With the altered perception of some colors. Mainly green, red and blue – and the colors derived from them. This is because dyschromatopsia, also known as color blindness, affects cells located in our retina, called cones, which are responsible for perceiving each of these colors. Color blindness is a recessive anomaly of the X chromosome. There is no treatment or cure, but it is possible to find lenses and glasses that help minimize the problem.
Curiosity: In normal vision, green, red, and blue pigments are well defined.
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Each one with its color
Types of color blindness affect different tones
SEPIA BLOOD?
Type – Protanopia
It is when there is a decrease or total absence of red pigment. In his place, the colorblind can see shades of brown, green or gray. It varies according to the amount of pigments that the object has. Green tends to look similar to red. It is as if the vision of red and its mixtures were seen as sepia
– How did the names of the colors come about?
BROWN HOPE
Type – Deuteranopia
A color blind person with deuteranopia does not see the color green! But the final result is similar to that of protanopia, that is, the tones seen are pulled towards brown. Thus, when he observes a tree, he sees everything in just one color, with a small difference in tone between the trunk and leaves.
Curiosity: Some colorblind people have problems with two cones and perceive only one color. Red and green are the most common
PINK WORLD
Type – tritanopia
The rarest kind of color blindness interferes with the vision of blue and yellow colors. The total vision of blue is not lost, but the shades seen are different. The yellow turns to a light pink. Orange doesn’t exist anymore
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Are you?
Take our test
Developed in 1917 by the Japanese physician Shinobu Ishihara, the test that bears his last name is one of the most used tests in the world to detect the disease. The method consists of a set of 38 plates with colored dots at different intensities and, in the center, there is a numeral with a color that the color blind person cannot identify. The result is easy to see: if you see the number in the center, you are not colorblind. If you don’t see it, better look for an expert. The colors vary to diagnose the patient’s degree of color blindness.
Curiosity:Do you want to simulate how you would see if you had color blindness? On the website bit.ly/testedalton, you can choose an image, select a type of disease and simulate!
SOURCESDr. Giovanni Colombini, board member of the Brazilian Society of Ophthalmology and head of the Ophthalmology Service at the University Hospital Gaffrée e Guinle, Unirio
Reader Question – Catarina Hubel, Sao Paulo, SP