Originally Posted by noimagination

The vents in the picture of the helmet you've attached to your post are for ventilation. Yes, you can stick your glasses in there, but they are not designed specifically for holding glasses. You just need to find a helmet with vents located there, as nearly all are (maybe not aero helmets for time trials).

Saying that those helmet vents are designed for eyewear is like saying that a shirt with buttons is designed to hold eyeglasses because you can fold your glasses and stick one of the earpieces down the vee above the last button to hold your glasses.