I've been looking for some nice goggles for airsoft use, and since I wear glasses, I want some that will fit over them.

I found these on cheaperthandirt, and they fit over glasses, and someone reviewing them claims that is 470 FPS airsoft gun only dented them a bit.

Since I probably won't be playing with anyone with a gun shooting over 400 FPS, I was wondering if these are safe for airsoft use.

http://cheaperthandirt.com/ZRW117-290-1401.html

they should you should order them and then test them out, then I might get me a pair

Here are some nice ESS inserts that allow you to wear glasses under the goggles:
http://www.essgoggles.com/Profile---ICE-Rx-Lens-Inserts_12_detail.html

And these are the goggles they will fit in:
http://www.essgoggles.com/Profile-Series-Goggles_1_detail.html

Yup it's on the expensive side, but way worth it.

DO NOT buy the ones you have linked! My bro has them, and the lens is VERY flexible, and I doubt it will withstand 450fps, if it does then you are lucky.