1) Go back to a full face helmet.
2) If you continue to wear half helmets, buy cheap sunglasses and keep an extra pair on the bike.

When I used to wear a half helmet, I lost glasses. Anytime I looked down at highway speeds, glasses gone... Anytime I turned to look behind be at highway speeds, glasses gone... I started buying cheap glasses at bike fests and keeping an extra pair on the bike.

Only thing worse than loosing a pair of sunglasses is the instinct to try to grab them as they blow off. Not a good move at highway speeds.

For the last several years it is nothing but a full face or full face modular and I've gone back to Raybans and Maui Jims without worrying about losing them. Hell of a lot nicer looking through high quality polarized sunglasses.

 

I've always worn 3/4 helmets and some kind of glasses...sun or prescription...and I've never lost any while I was riding. Now, with my face shield, the wind isn't a problem.

 

Put the glasses on then a bandana over the glasses and your ears. Then a helmet if you wish. No more bobble wobble.

 

In the beginning I wore a skid plate. I have to wear glasses so I found a pair of goggles that would fit over my glasses and help to protect my eyes better. If my goggles got a little loose, all I did was adjust the strap that held them on and that took care of it, simple.