Actually, it may be more common knowledge than theory. After owning two pairs of R1s, I believe the thinner the shocks you use, the less chance you will have the lenses cracking on them. When I bought the Jordan R1 off CL, the previous owner had 50 shocks in them. That made the ear stems angle very hard towards each other at the tips. If you don't put them on and off like you would with a pair of goggles, then you can very easily crack the lenses. Since I have a rather huge melon, I put 15 shocks in them and therefore the angle on the ear stems are almost straight so the tips are more parallel to each other rather than angling towards each other. This leaves a much wider berth at the tips so you can put the frame on like a regular pair of glasses with far less stress put onto the lenses. Granted this only works if you have a huge noggin and need to use 15 shocks. If you have a smaller sized head and need 50 shocks, then you definitely need to put them on and take them off like a pair of goggles. I also tried them on without any shocks at all and they more than easily cleared the width of my head while putting them on like a regular pair of glasses. Sans shocks is definitely not advisable though. To be safe, if you don't want any risk of cracking the lenses even if you are using 15 shocks, the goggle method is still a safer bet. But yeah, basically the idea is that the thinner shocks you use, the less chance you have of cracking the lenses.