I thought about getting a modular or "flip up" helmet myself. Most of the better ones shouldn't pop open on you...but then you never know what might happen in a crash.
I don't wear regular eyeglasses, but I almost always wear sunglasses. I think for now I can put up with the slight inconvienace it takes to remove my specs, put on the helmet, open the visor, slip my glasses back on...or , open the visor, take off the glasses, remove the helmet, put the glasses back on...
Those extra steps don't bother me as I just feel the advantage of wearing a full face helmet is worth that little bit of trouble.
There are some nice flip helmets on the market, if I were to buy one I'd likely get the Shoei Multitec , a bit expensive, but I really like Shoei helmets.
Many folks I know that have flip helmets say they hardly use the feature, except for the whole eyeglass thing.
If I lived in Europe where I constantly might find myself having to show my face at borders ...(your papers please..)..the flip up would make alot of sence to me.
I don't think any flip helmet has managed to get a SNELL sticker, and I have heard of some opening up in a crash, so for now I'll stick with the full face helmet.
But if the whole eyeglass thing just bugs you that much, make sure the fiip helmet you get fits well and will in fact go on without you having to remove your glasses. (on some the padding on the sides end up knocking you glasses anyway)
I know several riders who have the Nolan Flip helmet and do like it.
I think when it comes to safety equipment , only you can make the call on what you are comfortable with.