These Ray-Ban Junior Frames measure 47mm across each lens, 15mm at the nose bridge, and 125mm from the temple back to your ear. This means they are generally for pre-teens and teenagers. I cannot stress this enough! You will not happy if you have an adult-sized head and try to wear these glasses. They will not fit you!That being said - I have a smallish head, and I've always had to wear junior size glasses. These glasses fit me perfectly, straight out of the package, with absolutely no adjustments necessary. Furthermore, having a small face and head, sunglasses have typically looked gigantic and silly on me, and they fall off all the time. These frames look "normal" on me which is a huge relief.Lastly, I do wear prescription corrective single vision lenses for nearsightedness (myopia). These frames had the same 47-15-125 measurements as my normal indoor frames, and they fit the same. I was able to take these Ray-Ban frames to my optometrist and have them fitted with tinted prescription lenses that perfectly match the color of the original Ray-Ban lenses that the product was shipped with. It took my optometrist a single day to make, tint, and fit the new lenses to these frames.One downside: Ray-Bans do NOT have spring-loaded hinges, so the potential for breaking off an earpiece is greater than with other glasses you may have owned. I knew this fact before purchasing them, so that was fine.Color is beautiful, lenses that came with the glasses were nice, the prescription lenses I had made are equally nice. Great fit, love everything about them. Other people give me compliments because they're so classic and stylish. Never leave home without them!