progressive lens; multifocal lens
Technical term in optics and eyewear; refers to lenses with a gradual change in focal power, commonly used in glasses for presbyopia.
Progressive lenses are used in bifocal glasses.
遠近両用レンズ is a broader term for bifocal or multifocal lenses, while 累進焦点レンズ specifically refers to progressive lenses with a seamless transition between focal lengths.
Compound of 累進 (progressive, gradual increase), 焦点 (focal point), and レンズ (lens). A modern technical term.