With your helmet and glasses on, check where the temple of your glasses sits.
The mount should be attached at the same position as the glasses temple.

For most full face helmets, including SHOEI, AGV, LS2, and HJC, lift the cheek pad

and attach the Velcro to the inside of the helmet where shown in Step 1.

Attach the mount to the Velcro from Step 2.

Align the mount with your eye line, and position it with the tip facing either downward or upward, depending on your preferred fit.

After completing all steps, close the pad to complete the installation.