Don't use "all in one" cleaner/waxes that contain polishing abrasives on your new lenses. Use of a high quality Carnauba wax will fill in fine scratches and protect the original UV coating. Apply often.
I'm of the opinion that most badly weathered polycarbonate lenses had the wrong products used on them early in their lifecycle. Treat them gently like the coated plastic lenses in your glasses/sunglasses and don't delve into the world of restoration products until they really need restoration.