Printed on the inside of the temple of each SEE frame is a number that looks like this:

49 x 22 - 145
[ lens width x bridge width - temple length ]

Each of these numbers is a measurement in millimeters. In the example above, the measurements are lens width (49mm), bridge width (22mm), temple length (145mm). 

 

Lens Width

The first number printed inside the temple is the lens width - the horizontal diameter of the lens.

Bridge Width

The second number printed inside the temple is the bridge width.


Temple length - frame measurements

Temple Length

The third number printed inside the temple is the temple length.