Well, I have a Shoei RF1000 and I can't wear my Oakley's under them. There is not enough room between the padding and the side of my face. They just don't fit right and my glasses pop up off my nose so they are like halfway over my eyebrows instead of my eyes. It could just be the way the glasses are shaped because I didn't have the problem with a pair of Smiths, but the earpieces were shaped differently.
I wear glasses & a full face helmet (shoei). The only helmets that my glasses didn't like were the ones that fit too tight which ain't good anyway. If you get a proper snug fit the pads are still soft enough to push glasses past.
edit: My regular glasses and my prescript sunglasses are somewhat low profile, not as wide/bulky as many of the other sunglasses out there.
I've used Hjc, Nolen, and now Scorpion all where glasses freindly.Used a flipp up for a bit also. It helped a little as for putting the glasses on but not as much as I had hoped it would,Not worth the weight really.
Now what you will need is a good anti-fog.I use a wax stick thing I picked up at work.Bad news is there is no info on it as for where to get more.
I find I have no trouble with any full face helmet.
Trick: put the glasses on as if you were going to aim for the middle of your ear, not the top. A you push them in you can hook them over the top of ear as normal. If you try to put them on normally they will tend to go high and they don't fit on right.
I only use metal frames, not sure if the hard plastic frames would be different. Hope this helps
I wear a Simpson flip face (Dead white, makes me stick out like a sore thumb on rides), and gf wears AFX (NFX? Never can remember) with her non scrip sun glasses. Both work just fine, because they fit well. Try out a helmet or five at your local, friendly cycle shop with your glasses and see what works best with you.
It all depends how tight the pads fit against the side of your head (already mentioned) and how rigid the eyeglass bows are. If they flex too much it's difficult to get the bows hooked behind the ears. I have resorted to modular full face models also. There is a down side however, more wind noise.
i must wear my oakleys anytime i am outside during daylight..(light sensitive i also have to have a mirrored shade even at night!!) and i have had no problems with the hjc, shoei, and now the kbc helmet i have....
the kbc is tight enough to leave marks on my cheeks *(my angelic cute cheeks)... and i have no issues at all with the glasses..
the flip face helmets i dont care for... extra weight and if i fall off and go boom facefirst i don't want a chance of that front moving and messing up my pretty face...
Flip-up front style, works fine with my glasses. I don't have to remove glasses to put it on/off, and it has a drop-down sunscreen built in, so I don't have to pull over and change glasses as the sun comes in or out.