butt-strap 
Part of the temple that hinges onto the endpiece so that the temple can be folded behind the frames.
bend 
Part of the temple that rests on the ear and where the backward curve begins.
earpiece 
Curved rigid round-tipped part at the far end of the temple that goes behind the ear.
endpiece 
Part attached to the side of the rim that connects the temple to the frame.
glass lens 
Transparent lens with optical characteristics designed for the needs of a specific person and shaped to fit a specific frame.
temple 
Hinged stem connected to the side of the rim; the end of it bends behind the ear to hold the lenses in place in front of the eyes.
bridge 
Part of the frames that connects the two lens rims and rests on the nose.