How to read glasses size?

[Micah]

What does the number "50,18, 140"on my glasses mean?

[Kayden]

Glasses size includes lenses width which is also called eye size, bridge width and temple length. So the number "50,18,140" on your glasses means that your eye size is 50 millimeters, bridge width is 18 millimeters and the temple length is 140 millimeters.

[Jace]

50 means the width of the lens, 18 means the distance of the bridge, 140 means the length of the temple or the arm.