What is the primary element of a mounting component that holds the lenses?

The primary element of a mounting component that holds the lenses is the rim. The rim is specifically designed to encircle the lenses, providing stability and support, ensuring the lenses remain securely in place within the frame.

While the bridge connects the two lenses and helps stabilize the glasses on the nose, it does not hold the lenses themselves; it’s more about joining the two sides of the frame. The temple, often referred to as the arm, extends back over the ear and does not interact with the lenses at all. Pad arms are components that support nose pads, which provide comfort but are not responsible for holding the lenses. Thus, the rim is integral to the functionality of the eyewear, directly impacting the effectiveness and security of the lenses.