[QUOTE=Bikey Mikey;13881813 maybe transitions so I can use them in Sunny and Cloudy conditions.[/QUOTE]

It's not light that makes them turn dark, it's UV. So they can(do) turn dark on cloudy days, too. And if you are on a light surface, like the beach, snow, or a concrete road, the reflected UV will make them turn as dark as a bright sunny day. Sometime they may get a bit too dark, and you can lose details, like a low hanging branch, or road debris. I try not to wear mine on cloudy days, if I remember to switch, for this reason.
Of course these are just my experience, others may have had no issues.