I'm looking to get some additioal Sweep lenses for my Pro M-Frames. Howwever, I'm undecided as to whether to get vented or normal ones. Do the vents make a lot of difference re. fogging? How much wind do the vents let in (I don't wnat to get wind/grit in my eyse, kind of defeats the object of wearing glasses)

Also, what lens shape do you think is best for riding. I have both Heater and Sweep, but I'm looking at the Hybrid S lens shape as well

I'd appreciate your thoughts on the matter.

use vented hybrid s lenses myself. The vents only let enough air through to supposedly stop them steaming up as much.

As for the shape, its whatever you want really

I've used both and the vented ones definitly fog up less.

As steve said the vents aren't really big enough to let anything untoward through.

As for shape, whatever suits your face!

Looks like I'll be going for vented, then.

Thanks for your input