To sum up, short-sighted people have the following three characteristics:
1. They only see people and things in their own region, this position, and their own circle. Not seeing the outside world is like "sitting in a well and looking at the sky."
2. Do not look at the problem thoroughly, only look at the surface, not the essence, and are often misled by superficial phenomena, that is, "buying a casket for a pearl".
3. People who only care about immediate interests and do not look at long-term interests are "killing the chicken to get the egg."
In general, it means that the brain is "missing a muscle", or it is "not smart enough".