I've bought two pairs of eyeglasses online with my current prescription, but they feel funny when I try to use them - they are better than no glasses, but noticably worse than the current glasses that I wear (the same prescription) even though those glasses are quite scratched.

If you've bought glasses online, how have you found them? Where did you buy them from?

I bought mine from Zenni optical because they were really cheap and I had heard good comments about them.

The glasses I received are too small for my face - I thought I had the measurements from my prescription filled into the online form correctly, and I thought I was getting the correct size. In the future, if I buy online, how can I know which glasses to choose? I don't understand the information given for each pair of glasses on the online sites - which numbers correspond to the total width of the glasses between the earpieces (if I know that I can measure against my current eyeglasses)??

Thanks very much