I wear prescription glasses, and I add clip-on sunglasses when I ride on sunny days, either the ones that came with my glasses, or the several extra clip-on sunglasses that I bought at Walmart for about $8 each, so I have a pair for each vehicle and a pair at work and at home. I had to bend the earpieces for my new glasses so they would slide into my helmet easier- take glasses off, then put on helmet, then put glasses back on.
Several people recommend the new Bell brand full-face helmets that come with a visor that automatically darkens and lightens. There are also a few helmets with a sun visor that slides up and down inside the clear visor.
I move my chin down during heavy glare, so the top of my helmet blocks more light, and I adjust my helmet lower than normal at the bottom front, even with sunglasses when the glare is bad, going east in the morning or going west at dusk.
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