The color-blindness is not strictly speaking a visual pathology, but rather a particularity that modifies the perception of the colors. Transmitted genetically, this anomaly is going to last the whole life without aggravation, nor improvement.

While observing a geranium in light of a candle, the English chemist John Dalton had the feeling that he didn’t discern the colors correctly. This is how was identified, since the end of the 18th century, the anomaly of perception of the colors named color-blindness.

A masculine anomaly transmitted by the mother

This “blindness of the colors” is bound to a relatively frequent hereditary genetic anomaly, but of which the consequences are essentially masculine since 8% of the men are only reached for 0,5% of the women. This disparity is due to the fact that the gene of the color-blindness is carried by the chromosome sexual X and that it is recessive, that means that the presence of a normal gene is sufficient so that the anomaly doesn’t express itself. The woman having two X chromosomes, it is only color-blind if these two chromosomes, inherited of his two parents, carry the deficient gene, rare possibility. Read more »