how do you prevent and cure eyestrain?

You can wash your eyes with warm black tea water, it leaves a cool feel and diminish any feeling of heaviness :)

I was having really bad problems with eyestrain and headaches because I spend all day on the computer for work. I didn't aways have the option of giving myself a little break because my old job was really demanding. It got so bad that I eventually gave it and went to the eye doctor's. Now I have a very light prescription pair of glasses that boost my eyes just a little bit so they don't get too worn down at the end of the day. I can't tell you what an amazing difference it makes.

I shall give direct source instead of giving my tips taken from other sources : http://www.naturaleyecare.com http://www.visionworksusa.com/computereyestrain.htm