Frames can be classified by style, and are available in numerous material combinations:
Full Frame
- Lenses are completely enclosed by the frame eye wire.
Semi-Rimless Frame
- only a portion (usually 1/2) of the lenses are encircled by the frame eye wire.
Rimless Frame
Virtually no portion of the lenses are enclosed by the frame eye wire. These are often referred to as "drill mount" frames because the frame chassis is held together by drilling a hole in the lenses and secured with screws or pressure fasteners.