Unfortunately I'm sending them back because I can't find anyone to add my recipe to them as described. I took a picture and zoomed in. You can see they are molded in one piece so they won't separate when the screw comes out to remove the lens. I was told they were probably glued. I'm still giving those 4 stars because I love them - love the fit, love that weird little grommet and they're so comfortable. I wear small round glasses and I always lost a bridge of the nose with every pair of glasses. I am very disappointed that I cannot use corrective lenses. Oh the measurements are not exact, I ordered 43mm and they are 46mm. I still like them, just wish I could get prescription lenses in them.
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