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well, typically refractive error and aberrations are the most common sources for decreased night time vision performance but even a pair of spectacles can't do too much vs. incorrect projector angle or shitbirds stuffing ultra blue PIAA bulbs into reflector housings......
i've also had patients say "well i can't see the road unless i have my high beams on at night, so i drive with my high beams on all the time"
probably could make a rage comic out of that one.
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