If you already have a pair of glasses,
you can compare the measurements to your
current frame. Just look inside your temple
to find your frame measurements. The overall
frame size is a combination of lens and bridge's
width measurements.
Lens Width
Bridge Width
Temple Length
XS
< 42 mm
< 16 mm
< = 128 mm
S
42 mm - 48 mm
16 mm - 17 mm
128 mm - 134 mm
M
49 mm - 52 mm
18 mm - 19 mm
135 mm - 141 mm
L
> 52 mm
> 19 mm
> = 141 mm
How to read your Rx:
First off, you must identify whether you have a glasses Rx or a contacts Rx. A contacts Rx should have the
name or type of contacts as well as your vision correction numbers.
The prescription may or may not have the numbers in a table format as above. The above prescription may have
been written as: Acuvue2 OD: 8.7/14.0 -2.00 etc... in which case, you will have to determine which parameter is which.
Generally, the numbers will be obvious, as the options in the drop down menus will correspond with your numbers. If
you have any doubt, please give us a call.
The following terms are used interchangeably in most prescriptions: OD = Right Eye and OS = Left Eye. Power = Sphere Cyl = Cylinder Ax = Axis BC = Base Curve Dia = Diameter
If your prescription indicates that you have an astigmatism (i.e. you need toric contact lenses), sometimes the cyl and
axis are written this way: 8.7/14.0 -2.50 -1.00x70 In this case, the cyl would be -1.00 and the axis would be 70