HOW DO I MEASURE MY EYEGLASSES?
When it's time to pick a new set of frames, there are a few measurements to keep in mind in order to find a pair that fits correctly and comfortably.
For a great fit, you will need to measure for three things - lens width, bridge size and temple length. If you already have glasses, these should be a located along the inside of one of the arm pieces or on the nose bridge area. If the numbers aren't printed on the glasses, here's how to figure out what the measurements are

Bridge Size
Bridge size refers to the distance between the two frames where your nose comes through. Measure the distance from frame to frame or lens to lens (if you want with a frameless pair of glasses). Be sure you take this from halfway between the bootom of the glasses and the actual bridge. Expect it to between 14 and 24 mm.
Lens Width
This is how wide your lenses are in millimeters.Keep in mind that this is just the lens, not the frame. Using a ruler, measure from one edge of the lens to the other horizontally in the center of the lens. This will be between 40 and 80 mm.
Temple Length
As it sounds, temple length is the length of the temple, or arm piece. Measure from the hinge to the very back and expect it to be between 120 and 150 mm.