Unlike traditional solid saddle bridges that rest directly on the top of the nasal crest, a keyhole nose bridge features a distinctive cut-out shaped like an old-fashioned keyhole. This structural gap allows keyhole bridge glasses and keyhole nose bridge glasses to touch only the sides of the nose, evenly distributing frame weight. This ergonomic design eliminates red pressure marks for wearers needing high nose bridge glasses while offering a secure, comfortable anchor. To verify exact bridge width measurements before ordering, review our interactive fit guide.