I had my doubts but they snapped onto my computer glasses fairly easily (a bit heavy as my glasses may have thicker frames). My main reason for buying is as I usually sit at my computer all day reading, they help kids who have been online a lot (classes) and had trouble sleeping. My son also works on the computer and bought regular glasses many years ago. I don't know if this helps everyone, but I'm definitely sleeping better and sleeping better after using them!
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