Excuse me, were ancient people color blind?

Color blindness is a genetic problem. Generally speaking, 8% people have color blindness gene, and 5% people will get color blindness.

-All age groups are similar.

There are many reasons for myopia, some are born and some are overused.

Of course, there was myopia in ancient times, but the incidence was less than now-first, there was less reading and no computer; Another ancient environment is better.

Someone wrote a doggerel mocking myopia in Ming Dynasty. The poem said: "It's so strange to laugh at your eyes, so I stood next to him and asked who it was?" The sun shone marbles through the window lattice, and the moon moved to pick up sticks. I looked at the painted wall, black and blue, locked the book box and twisted my eyebrows. More funny, blowing lights burns lips and skin. "