These glasses are very cheaply made. Something I expected from a dollar store. Not worth $20. As for the blue light filtering - I saw minimal difference by taking my glasses on and off, blue light hitting white paper. This month I bought 3 pairs of glasses for my family and they were the worst of them all. My daughter bought a FEIYOLD which seemed to be the best of the three and for only $10. She also showed the strongest blue light blocking. My wife is committed to reading and falls somewhere in between in terms of quality and blocking. She hadn't used them for a real comparison yet. But also around the $10 mark. Either way, I'll use them until they break.
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