Frame Size Finder
What do these Eye-Frame Measurements mean?
The easiest way to get the correct eyeframe size is to get the dimensions from a comfortable pair of prescription glasses you already have.
On one of the arms you will usually find (with the aid of a magnifying glass) three measurements, the first two separated by a rectangle.
They measurement do not need to be exact, but the closer they are to your existing pair, the more likely your new prescription glasses are to be a comfortable fit.
Image showing how to read your frame dimensions
Look inside an exiting eyeframe, usually on the arm, for a series of numbers like 50-20-140. These are the lens width, bridge size, and temple length, respectively.