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 wore glasses for about 2 years of my life and when I finally didn't have to wear them anymore I kind of missed it.