What type of bridge generally provides a snug fit without covering the entirety of the nose?

The keyhole bridge is designed to offer a snug fit without making contact with the full surface of the nose. Its unique shape features a notch or "keyhole" in the center, which allows it to rest securely on the bridge of the nose while leaving space on either side. This design helps distribute the weight of the eyewear evenly and can enhance comfort, particularly for individuals with varied nasal structures.

This bridge type is particularly useful as it accommodates a wide range of nose shapes and sizes, creating a fit that often feels more comfortable than designs that cover the entirety of the nose. By keeping some areas free from pressure, the keyhole bridge can minimize discomfort often associated with prolonged wear.

Other bridge types, like the comfort, saddle, or strap bridges, tend to either cover more surface area or employ different design principles, which may not provide the same level of adaptability or comfort for every wearer compared to the keyhole design.