For me this frame seems to consistently break once every two years. I then replace it with an identical, and the cycle repeats.<br /><br />I learned the hard way that inserting the plastic prescription lenses into a new frame is not something that should be attempted at home. It is expected to require intense heating of the frame as done by a professional, only after which will the lenses fit. Attempting to insert lenses without sufficiently expanding the frame will guarantee a broken frame.