The shape of your face is often related to width. A narrow face is often oval or angular in shape, so small glasses are usually appropriate here. A face of medium width may be any balanced shape, while a wide face is often round- or diamond-shaped and large glasses are appropriate. You'll find the size of a pair of glasses etched or printed into the interior of the temple or arm or the inside of the bridge. It is given as a series of three numbers separated by dashes: for example, 50-18-40. The measurements are given in millimeters. The first measurement in the size refers to the lens width, which affects overall width. The second measurement is the bridge width, ranging from narrow at 15mm to 18mm for a narrow nose bridge and/or closer-set eyes, or up to 22mm to accommodate wide-set eyes or a wider nose bridge. Temple length, the third and last number in the string, refers to the arm length. The most common measurements range from 135mm to 150mm in multiples of 5mm. The temple should sit horizontally - and not tilt - over the ear.

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