In the three pack of these glasses, one pair (the tortoise color) the lenses are fine....with the other two pair (purple and black) when you put them on they almost make your eyes cross...this is the strangest thing, it's as if the lenses were not put in correctly and they are concave?! Very pretty and sturdy but 2 out of three are not wearable.I loved every pair and color...I will be buying another set.These replaced my other reading glasses that had a slightly thinner and more conservative frame. I live the variety of this pack, and they are just a tad bit funky, just like me, LOL. Stylish and they look more expensive than they are. I get tons of compliments on them, especially the black/pink, tortoise, and clear. Super fun to change them out! Highly recommend!