How to repair Eye Glasses?

Take it to a optician/optemetrist for help. They usually do not charge.

is this some sort of new spam ad for Megamind?

Do you have your prescription? Chances are decent that you'll need to replace the bad lens, especially if it's plastic.

How much did you pay for them?

If heavily scratched, they are gone.

Goggles4u.com, zennioptical.com, eyebuydirect.com, coastalcontacts.com

Within a month you'll have rx glassess under 20 bucks. You need rx though. If you can't afford that, take your glasses to an optometrist and ask them to write down the axes, cylinder, diopter for both eyes, they can measure it.
Check the websites to see what you need.
Good luck.

As an optometry student, I know for sure that the new antiglare coatings are not coatings at all and are bonded into the lenses. The big lens vendors will not provide cheap Costco and Lenscrafters to sell their best products and will only vend their best products from optometry offices. Just sayin... As for the idea that an optometrist will write a prescription based on a pair of glasses, no. It is against the law to measure a pair of glasses and write a new prescription based on that. The glasses could belong to anyone. The laws are written by insurance companies who try to prevent this type of fraud. What appears you've got is a case of sprayed on coating that has fogged up, not worn off. Wearing off will result in sharp demarcations where the coating is on and off. Or a poorly made lens. The fact that only one lens has fogged up can only mean that your vendor did not spray the correct coating on the correct material. Different materials will absorb the coating differently. Looks like your vendor used an old lens laying around that he had to sell or absorb the cost. He should have made sure both lenses were of the same material. I've got a pair of glasses with antiglare that has lasted over 6 years and nothing wrong with them. But then again, as an optometry student, I don't abuse my glasses with toothpaste, wheel cleaner, and DVD cleaner... Now that these glasses are already ruined, you might want to try plastic polish which will attempt to fill in the gaps. You can find it at hobby shops. It probably is the best thing you can use and probably should have been the first thing to attempt. From your photos, I can't really tell if it's scratched up or if it is fogged up. If fogged, then nothing will help. If scratched, plastic polish.

Also, if you have your prescription, you can get some pretty decent looking glasses with lenses for ~$50 http://www.goggles4u.com/eyeglasses....stic&offset=30 Upload a headshot and you can do a virtual try-on of the frames. Also, they have a lens replacement service http://www.goggles4u.com/relens.asp

Just go to Zenni and buy glasses.

I tried a pair of prescription sunglasses and a pair of sports wind-goggles on the cheap and liked them so much that my daily wear glasses are some $19 acetate frames (with the $5 AR upgrade).

Between my friends and I, I have handled maybe 7-8 pairs of theirs and the quality is usually good. 1 of the $8 frames kind of sucked but another $8 frame is one of the nicest feeling...so I guess it is sort of random.

Sorry, I meant optician. It is of course legal. It is not a prescription, they just measure and tell you what your glasses are. However four years is a long time not to have an eye exam.
Eye exam at Walmart is usually cheap, also Costco (you do not have to be a member)

maybe you can try wetsanding with a very fine grit sandpaper? takes out haze in headlights in cars might be a similar case for glasses?