Hello dear steemians,

This week's initiative of @derangedvisions is very interesting. This reminded me that weeks ago, I was talking with my son about the vision of dogs. It used to be said that dogs do not see in color, that their vision only distinguish the black and white silhouette. My son found on the internet that this statement was false. Dogs do distinguish colors, but with less definition than humans.

Now, there are people who have a genetic disorder that prevents them from distinguishing between the colors green, red and blue. They are called colorblind.

In addition, within this group are those who suffer from Achromatopsia, it is estimated that there are 30,000 people in the world who see in grayscale and much less people in black and white. Fortunately, this is a rare disease of congenital origin.