I accidentally grabbed the 3%hydrogen peroxide to put my contact lense in?

You will be fine. Your eye will hurt like hell and be inflamed but you will be fine.

The hydrogen peroxide burned off the epithelial layer of your cornea and that layer regenerates after 2 hours. In fact some infections are treated by burning off the epithelial layer with numbing. Your inflammation should go away after a few days.

If you feel sharp pains the next day then yo ushould see your optometrist. The damage might have gotten to the stromal layer of the cornea which is unlikely but that would mean trouble.

I actually use a the sauflon one step solution, which is a peroxide solution so this isnt as bad as u think. U arent suppose to get it directly the solution in your eye, but it the burning should go away with time. Even though the soultion and pur hydrogen peroxide arent exactly the same, they're pretty close. I would just get a wet paper towel and put it over ur eye. If it still burns or ur vision is impaired, go to the eye doctor and he will most likely give u some drops if its tht serious.

Flush that eye out thoroughly with saline solution.