Frame Measurements 

Frame Width

Measure horizontally across the frame from hinge to hinge.

Lens Height

Measure the lens vertically at its tallest point.

Bridge width

At the top of the bridge, measure horizontally one lens edge to the other.

Temple Arm

Measure from the hinge to the bend, and then the bend to the end of the arm. Add the two measurements together.

Lens Width

Measure the lens horizontally at its widest point.