For years (6? 7?) I wore a clear visor with Bollé sunglasses underneath, and most of the time apart from very cold days, I used to ride with my visor up. The Bollés fit quite closely to my face, are optically correct, neutral tint, and reasonably thick shatterproof polycarbonate. The arms were thin metal, so they fit very well under my helmet. However, when I got my X-Vent with two visors (clear, and tinted/mirrored), the tinted visor was so much better than wearing sunglasses that I stopped using the sunglasses. Just as well, because I lent them to my son and he lost them.
Sunglasses and a clear visor is better in some ways (versatility, changing light levels), but more fiddly, and I dropped my sunglasses many times fiddling with helmet, gloves, sunglasses, etc. I even ran them over once. For cutting out glare, the tinted/mirrored (yeah, it's both) visor is better.
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