I bought these for my friend who 1) sits at his computer all the time and 2) wants his vision bad so he can wear glasses (he likes the look). I thought they seemed a little weaker than they looked when I took them out of the box - the plastic feels a bit cheap - but so far they've held up well and he loves them. Obviously the filter works - if you hold it up to a computer screen you can easily see the difference through the lenses. I have prescription glasses with a built in blue light filter and I'm pretty sure they are stronger than the filter on my glasses.
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