Oh, I think this problem can't leave with the great pressure upon the asian students. They have to study very hard to get high score. And they are not taught about the right using of eyes knowledge. They just look at the books so near and watch TV and play computers for a long time.
I found some explanation we can here from others for the reasons that Asian people always have bad eyesight. And here is an interesting one:
It is said that in Asian countries, children are always asked to read a lot , which makes them a bad eyesight since child's eyesight is not stable and easy to get worse.
I believe this must be combination of all the factors that can explain why Asians tend to have a bad eyesight, and it must have some relationship with the gene things.
Many asians have bad eyesight, there are two typical explanations that people generally accept. First, that it's genetic and tied to Asian genes. Second, that Asian parents make Asian kids read so much that they mess up their eyesight. On the other hand, people use computers or watch TVs or read books for long time, and their eyes are very closed, they do not notice the space between eyes and computers or TVs or books. They also do not care about how to protect eyes.