Glasses are easily portable and don't have as many problems, although can't be used in as many situations.
Contacts are invisible, colorful in some cases, and can look better on some, but can hurt like hell if put in wrong.
[b][i][u]CHOOSE.[/u][/i][/b]
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I don't wear contacts anymore because I fell asleep while wearing them...that was a terrible thing. So glasses ftw.