I've had glasses for about six years, and my prescription hasn't changed - -1.5 left, -1.75 right. In the past six years, I've started to use a computer more and more, and with a degree that deals solely with computers I finally have an excuse to sit in front of both of my monitors for 18 hours a day (sometimes periods of over 30 hours, if I've got a big deadline).

My eyes haven't deteriorated since the initial need for glasses.