What is the term referring to the housing for a screw on a pair of glasses?

The term that refers to the housing for a screw on a pair of glasses is the barrel. In eyewear, the barrel is specifically designed to accommodate the screws that secure the lenses within the frame's front. This component is crucial because it helps maintain the structural integrity of the glasses by ensuring that the lenses remain firmly in place.

In contrast, while the frame encompasses the entire structure of the glasses, including the front and temples, it does not specifically refer to the component housing the screws. Temples are the arms of the glasses that extend over the ears, and nose pads are the small supports that rest on the bridge of the nose. Thus, barrel is the most accurate term used to describe the specific area where the screws are housed in a pair of glasses.