Re: How would you know if you need glasses?
Well, if your eyes are dry and tired, that doesn't necessarily mean you need glasses. Your eyes may be strained though because of the comp. I hear taking computer breaks helps. I know since this is your work, you can't take half hour breaks all the time, but try to look away from the computer every once in a while.
Can you still see as clearly as you did when looking at distant things?
Best way to know if you need glasses is to go see your optometrist. They give you the eye test and can tell you right away.