There is a False Reject/Accept problem here. If you believe your Amazon email, all glasses are fake (at least I've got email saying so for glasses I know are g

There is a False Reject/Accept problem here. If you believe your Amazon email, all glasses are fake (at least I've got email saying so for glasses I know are good). If you want a quick way to weed out bad glasses, see if you can see a compact fluorescent light bulb, with the glasses... if you can, they are bad. Unfortunately, you could still have bad glasses that happen to just block fluorescents. I used a spectrometer and a calibrated light source, but that seems like overkill for most folks. One trick I recommend is putting the reflective foil inside some regular sun glasses. It's uch more comfortable, and you get some extra IR/UV protection.