First of all: - They work. They fit my laptop perfectly about 1 1/2 feet from the screen - +0.75 looked ok and there weren't many vendors here selling below +1.0 - they give an orange/yellowish tint so guess me that they cut off blue light. Spring. I'm concerned about the quality - the lenses seem scratched even just looking through them. As if they were made of soft jelly. They can be scratched by wiping, they can be scratched with nails. You can scratch them when washing with soap and water - which you must do as they attract grease at every opportunity. The arms attach to the lenses through fancy holes held in place by a screw, itself held in place by a clasp. Mother. Needless to say, the nut loosens within a few days and cannot be tightened properly as it is too small to grab and tighten. hand fell yesterday. I would have left them out if the lentils weren't already milky. It would be nice to buy for $2-3, but for $15 it's no good.
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