It's hard to be sure they're working as intended. They come with a small blue light key fob and a light sensitive card so you can test the glasses. The test worked, but you won't notice any noticeable change if you use them while looking at a laptop or other screen. The glasses themselves are light and cute, but the lenses are very reflective. The glare on them is very noticeable from the outside, e.g. B. when someone looks at you or looks at themselves through a mirror or camera lens. All in all good for the price.
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