I`ve got a pair of polarized prescription sunnies and wearing them in the sun is like taking a drink from a cold mountain stream(as long as its not full of beaver fever)after you`ve been hiking for 6 hours.They really,really cut down the glare of the sun.Drawbacks-LCD displays seem to disappear(my temp.guage),tar strips look luminescent,I can see lines in my tinted faceshield,interior lighting is very dim(walking into a restuarant)and riding at night with my polarized sunnies and a tinted faceshield makes it very hard to see(when I`ve forgotten to bring my normal glasses).
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