Frame sizing guide

	Lens width	Bridge width	Temple length
Extra-small	< 42 mm	< 16 mm	< 130 mm
Small	42 - 48 mm	16 - 17 mm	130 - 135 mm
Medium	49 - 52 mm	18 - 19 mm	136 - 140 mm
Large	53 - 58 mm	20 - 23 mm	141 - 150 mm
Extra-large	> 58 mm	> 23 mm	> 150 mm

*This is a general size guide. Depending on the style of the frame or brand you choose, there may be some variations.

This information can be found on the temple of some eyewear. For example, the three number labels on the inside of a temple 51☐ 18  145 indicate that the frame is 51mm, 18mm and 145mm in frame width, bridge width and temple width respectively.