Free form glasses eyeglasses buying frames FFA 434 51-18-135 display model

Product Name: Free form glasses eyeglasses buying frames FFA 434 51-18-135 display model
Size: 51-18-135 Model: FFA buying 434 Lenses are demo lenses 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 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.