The frames shown in the image are all the same size but each one has a different fit. Sometimes there is a fourth number that indicates the lens height.įitting is aesthethical information which determines the amount of face coverage for a given size. There is usually a third number that represents the temple length, or the measurement of the 'arms' of your frame.
The first number is the model name, followed by the lens width and bridge width. If you already own a pair of glasses, you’ll find numbers engraved on the inside of the eyewear temple.
Or, you can use a ruler to measure the hinge-to-hinge distance of a pair of glasses that you already own. Try our Size Advisor and we'll measure it for you! This information defines the following sizes: Hinge to hinge (in) Hinge-to-hinge distance: the width of the frame measured from the inside of the eyewear starting from the center of each hinge.The size of the frame counts as functional information, which is defined by one principal number:
