Regarding this item, the hinge on the right side (when facing the item) was damaged once, and it has been repaired by Sato Megane. I don't feel any significant distortion or imbalance between the left and right sides, but please check the images. These are also prescription glasses, with -1.00 for the right eye and -0.75 for the left eye. The original sunglass lenses are also included.