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Rimless eyeglasses
Rimless eyeglasses, are a type of eyeglasses in which the lenses are mounted directly to the bridge and/or temples. The style is divided into two subtypes: three piece glasses are composed of lenses mounted to a bridge and two separate temple arms, while rimways (also called ''cortlands'') feature a supporting arch that connects the temples to the bridge and provides extra stability for the lenses.
Rimless glasses were a popular style of eyeglasses from the 1880s until into the 1960s, and re-emerged in popularity in the latter part of the 20th century and early 21st century. Despite these shifts, they are unique amongst eyeglass styles in that they have never gone completely out of fashion, remaining an acceptable alternative through the years to more stylish designs.
==Mounting methods==
Rimless glasses lenses are held in place (or "mounted") by way of a series of screws, or hollow plastic double rivets (called "bushings") that fit into two holes in the lens. When bushings are used, the temples and bridge have barbed metal pins that lock into the bushings, creating a pressure seal that holds the lenses in place. Although they are more cosmetically appealing, the bushing method is more fragile than the screw and nut method, and more difficult for laypersons to repair themselves in the event of loosening or breakage.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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