noun, noun which may take the genitive case particle 'no'
bifocal
Technical term used in optics and ophthalmology to describe lenses with two focal points. Often used attributively with の.
二重焦点レンズは遠くと近くの両方を見やすくする。
Bifocal lenses make it easier to see both far and near.
彼は二重焦点
He wears bifocal glasses.