https://goo.gl/of0WEk
I am going to try very hard to be polite here. It isn't easy because this question makes my blood boil. I am often harassed by people who take exception to the combination of my white cane, my glasses and the printed book that I am reading on the train. But since you asked, I will try to clear this up for once and for all. Read this next sentence very carefully please.
Most "blind people" can see some.
There are people who are totally blind. Some of them where glasses. Some reasons might be 1. to cover disfigured eyes and thus gain a bit in social acceptance, 2. to protect their face from branches and other obstacles and 3. to let other people know they can't see (again in order to avoid social problems and as a traffic safety measure).
However, 90 percent of legally blind people can see something, even if just light. Those who can see only light are often light-sensitive and bright light can cause pain. If they can't see much beyond light, they will rarely have a warning when bright light is coming. So, dark glasses are a real necessity.
Most "blind people" can see some.
There are people who are totally blind. Some of them where glasses. Some reasons might be 1. to cover disfigured eyes and thus gain a bit in social acceptance, 2. to protect their face from branches and other obstacles and 3. to let other people know they can't see (again in order to avoid social problems and as a traffic safety measure).
However, 90 percent of legally blind people can see something, even if just light. Those who can see only light are often light-sensitive and bright light can cause pain. If they can't see much beyond light, they will rarely have a warning when bright light is coming. So, dark glasses are a real necessity.