Color blindness
A color vision anomaly is a symptom that can not distinguish colors normally due to vision problems. It is often called a color blindness or a color blindness. The most common cause of these symptoms is genetic factors, but they can also be caused by eye, optic nerve, or brain damage or exposure to certain chemicals. The British chemist John Dalton, in 1798, published his first scientific paper on color vision problems under the title Extraordinary facts relating to the vision of colors, shortly after realizing that he had color vision problems. Because of this, in the past, color vision was sometimes called metronomic, and today it is used as a term to refer to red color vision abnormality. Color vision disorders are generally classified as weak levels of disability, but they also have advantages over non-disabled people in certain situations.