53: Lens width (in millimeters). The horizontal width of one lens. Bigger number = bigger lens. Most adults sit between 50–58mm.
19: Bridge width. The gap between the two lenses, where the frame rests on your nose. Most adults sit between 16–22mm.
145: Temple length. The arm of the frame, from the hinge to the tip behind your ear. Most adults sit between 140–150mm.
How to measure your current pair: flip them over. The numbers are usually printed on the inside of the left temple. Match them to ours to find your closest fit.