Wiley: Size & Fit Guide - Lens Width

The lens width, also called eye size, refers to the horizontal width of one of your lenses from the one side to the other, without including any of the frame. As the lenses define your field of sight, this is the most important measurement to ensure that the frame fits your eyes and face. The lenses are optimal, if they are as wide as your face and do not rest on your cheeks.