How transitions lenses really work
With a little digging, I was able to figure out how transitions lenses really work on this website:
http://en-us.transitions.com/Why-Transitions/The-Technology/Photocromic-tech/
To sum it up, within the lenses are photochromic molecules. These molecules react to UV rays and actually change their structure when exposed, which is what causes the lens to darken.
And some fundamentals of weather still play into effect. When it's hot, the lenses react more quickly because the heat allows molecules to move faster, which in turn means the photochromic molecules can change their shape more quickly. The reverse is also true for the cold, since molecules move more slowly in cold tempurtures, the lenses will react more slowly in cold temperatures as well.
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