[mikekchar]

I just wanted to chime in here because while I don't have a wide head, I have a long distance between my ears and my nose (i.e., narrow but long from front to back). It literally took me 40 years to figure out that if the arms of the glasses are not long enough, the glasses will tilt down, because the curve of the arm will sit on your ears. This results in really poor vision (as you can imagine). It sounds stupid that I never realised it, but hopefully I can spare someone else in a similar situation -- make sure the arms of the glasses are long enough!

[velosol]

Also might want to check out straight-armed glasses. Typically they'll have some roughness or rubber where they meet your ears to help stay on your head like some fancy sunglasses.

[KineticTroi]

BTW - These acetate frame arms can usually be heated carefully with a torch, and bent to straighten them up. Thus making them much longer. Sometimes you can even rebend them farther back. Though straighter arms are somewhat more prone to fall from your face.

[Cthulhu_]

Don't your glasses shops make sure to adjust the arms to your size? Mine does, they have a special device that heats up the arms so they can bend it carefully, and pliers to adjust the nose thingies.

[walterbell]

A bowl of hot water will usually work to bend acetate frames, but not plastic frames (which cannot be adjusted). Be sure to keep heat away from the lens/coating to avoid crazing.