PR 63WV 05L1O1 51FRAME SIZE: Small (53 18 140) Frame size is usually defined by lens width, bridge width and temple length. These values are always displayed in that order, in millimeters. mm inch As a reference, you may want to check the size of your current eyewear, by looking at the inner side of the temple. Should you see a fourth number at the end, this refers to lens height (i. e. 48 20 140 50).