How To Choose A Frame That Fits
Lens Diameter: It is equal to twice the longest radius of the lens, measured from its geometric center to the apex of its edge. It is expressed in millimetres.
Bridge Width: This is the horizontal distance between the lenses.
Frame Depth: This is the vertical distance of the lens, from the top of the rim to the bottom of the lens or rim as shown on the above diagram.
Total Frame Width: This is another measurement to consider, as shown on the above diagram.
It is important to note, aside from two times the lens diameter plus the bridge width, the overall width is also dictated by factors such as the thickness of the rims and the lug sticking out. Normally 2-4mm
Temple Length: This is measured from the point where the temple arm joins the frame all the way to the end that goes behind the ear.
There will be three standard numbers printed on one of the temples or the nose bridge, which make up the frame.
In this example the lens is 52mm, Bridge Width is 18mm and the Temple Length is 145mm.
Therefore you can use this as a guideline by comparing them to your current own glasses.
However to obtain a good fitting frame we have included two more measurements on our website which will make it easier to understand and ensure a better and comfortable fit.