Oakley eye glasses eyeglasses frames backwind OX3164-0251 51-18-139 retail light

Product Name: Oakley eye glasses eyeglasses frames backwind OX3164-0251 51-18-139 retail light
Size: 51-18-139 Model: backwind Color: light These are unknown lenses strength . This frame is preowned. Minor wear to be expected. See pictures. The eyeglass numbers are usually written as: xx-xx-xxx or they might have small boxes between the numbers on the eyeglass frame. 1. The first number in the retail eyeglass size is the distance across one lens of the eyeglass frame ( does not include the frame) 2.The second number in the eyeglass size is the distance across the bridge on the eyeglass frame. 3.The third number in the eyeglass size is the length of the temple(arm piece) from the front of the eyeglass frame to the end of the temple, which goes behind the ear.