I usually put my right hand inside my plutonite bag, and my left hand holding the frame. With my right hand i grab the lense (thumb on outside, other fingers inside) and pull against my left hand (holding the top of the goggle right where the O is). The lense should pop out of its little notch, then just continue doing the same thing around the rim in both ways. Dont be afraid to use force, the lenses wont break in a simple process like this, and the frames will definitly not get hurt because of the plastic theyre made of. Hope that helps!