1, red-green color blindness
Red-green color blindness (Daltonism) is partial color blindness, which can be divided into red blindness and green blindness. Patients can't distinguish between red and green, so they regard them as two colors: long wave (red, orange, yellow and green) is yellow, and short wave (cyan, blue and purple) is blue. Red-green color blindness is a recessive genetic disease of X chromosome, and its cause is controversial.
Step 2 find out
Dalton was a famous British chemist and physicist in the 20th century. He bought a pair of "brown-gray" socks for his mother on Christmas Eve. When mother saw the socks, she thought they were too bright. She said to Dalton, "The cherry red socks you bought are too bright. How can I wear them? " Dalton was very surprised. The socks are obviously brown and gray. Why does his mother think they are cherry red? Dalton was puzzled and asked his brother and the people around him. All the people who were asked said that the socks were cherry red except his brother. Dalton didn't let this little thing go easily. After careful analysis and comparison, he found that his color vision and that of his brother were different from others. It turns out that they are all color blind. Although Dalton was neither a biologist nor a medical scientist, he became the first person to discover color blindness and the first person to be found to have color blindness. For this reason, he wrote a paper "On Color Blindness" and became the first person in the world to put forward the problem of color blindness. Later, in memory of him, people called color blindness Dalton's disease.