I think the modular helmet I bought 5 years ago is an HJC CL-MAX2. I have very wide eyes (3 inch IPD) and at the time I had somewhat big (wide) glasses. I could not get my glasses on with a full faced helmet, so the sales guy had me try the flip-up, and that worked great. Liked the helmet for 4 years, liked being able to flip it up to talk to people, see gas pumps better, and of all the stupid things, to be able to spit when stopped at red light and you cough up something nasty at 7 in the morning...
It had that flip down sun-glasses visor thing, I only used it a few times. I almost always wear prescription polarized sunglasses, so that was just extra weight on my head.
Since then I have gotten smaller glasses and thought Id give the full face helmet another try, and got the RPHA. It takes a bit of fishing sometimes to get the temples in thru the opening with the helmet on - I was almost tempted to bend them out straight so they would slide over my ears, but I got use to it after a bit. Only problem now... several times I have tried to take my helmet off and forgot to take off my glasses first: OUCH!
A few months ago I got hearing aids, and quickly discovered I can wear them or my glasses, but not both with my helmet. Don't need to wear hearing aids while riding anyway, in fact on long rides I often wear ear plugs, so its not a problem.
Its funny, I had a Honda 175 street bike in 1978 when I lived in Florida. Buying a helmet was trivial - just went to Sears or Kmart, picked out a color I liked in a size that seemed right, they were about $25. After a few months I bought a 2nd one that I kept strapped on the back of the seat so someone could ride with me. Never even thought that my spare helmet might not fit the other person properly. Things were much simpler then. If you could squish it on your head, pull the strap on tight and we're good!