I really like these. Although they block blue light, they are lighter than the ones I've worn in the past, not with darker lenses, and you can't tell the difference in the computer tint when you take them off (you can definitely see the difference on others) So I'm not sure how strong they are. However, if you take them to a computer you can definitely see the yellow lens blocking harmful rays, so there it is. A nice bonus is that they also come with matching cases and straps if you want to wear them around your neck (although with five pairs that's not necessary!). The colors of the frames are very nice, I like them very much. All in all, for the price it doesn't get any better and I'm glad I bought it. They work perfectly and I would definitely buy more.
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