Even once mastered, resetting the threshold is definitely a matter of trial and error. After my first "successful" attempt at changing it, I found that the glasses were now switching back and forth too often, as I'd overcompensated. A subsequent reset in a darker area took care of that, though.
I also noticed that reflective surfaces such as manhole covers and car windshields took on a shimmering almost iridescent look, causing them to pop out at me like characters in a 3D movie. Ctrl told me that this is due to the polarizing effect of the lenses, and that it's a feature which may ultimately be dropped – I'd certainly vote to do so.
It would also be good if the glasses could go completely clear. I used them on a night ride and found that while I could adequately see where I was going, I could still see better without them.
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