I have fairly good eye sight, but still need glasses for the long range clarity. I have had transitions for years and before that Photo Grey's. The new transitions are good from dark to sun/bright, but they are a real challenge in -10 or colder. I can see good enough without my glasses to make a shot if I have too in those temperatures but it's not ideal. Once the sun goes down, or sooner if it is cloudy, but getting a bit dusky, I take off my glasses and tuck them inside my clothes to the base layer so they can warm up and then transition to clear. In -20 or colder, that takes a solid 15 minutes. Once they are clear, they go back on for the prime time last 15-30 minutes. If you don'e warm them up, they will not transition at all, no matter how long you are in the dark.
I still continue to use them, because they are so convenient for the rest of the year for maintaining eye health. Too many older guys can't see in the low light because they fried there eyes in bright conditions for too long.
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