Polycarbonate lenses are thinner and lighter than glass, and the poly is very strong, thus ideal for resisting impact. The best for active kids. People prefer poly glasses for their thin look and shapes that keep up with changing styles. Also, if one has a strong prescription, their light weight makes for easier wearing.

Glass is MUCH more resistant to scratching and is preferable for the careless person who cleans his lenses with paper towels and dishwasher liquid or has a tendency to put his glasses on stone or tile counter tops, etc. Glass lenses provide the clearest vision, and are preferable for those doing close, precision work.

Now Bobert is a problem. He sounds like a lens-scratcher, so glass will keep its clarity longer. On the other hand, he obviously needs the safety of polycarbonate since he engages in dangerous activities.

Lens polishing by an optician may remove cloudiness and the very fine scratches, but of course no more than that. I referred earlier to professional cleaning and repolish.

Coating adds some resistance to polycarbonate, but will never meet the scratch resistance of glass.