Some people feel the Bates Method of eye exercises have helped them. Here's one link of many that you can find on Google
http://www.ivillage.co.uk/health/ghe...182664,00.html
I tried the Bates technique and the exercises did nothing for me. I've been near-sighted since I was about 8. My Dad blamed me being such a book worm on my need for glasses. I DID read a lot - probably 4 or 5 books a week, but I also had two aunts and an uncle whose vision was as bad as mine, so I blame genetics and wear my contacts and thank God for them.
I'm serious about the glaucoma thing. People can develop it in their early 20's. My ex-husband was diagnosed with glaucoma at the age of 23 and what alerted the optometrist was my ex's loss of peripheral vision. Untreated glaucoma can cause a person to go blind, but there are simple treatments available that will stop this from happening. If you really feel you have lost peripheral vision, check with your doctor.