What type of lens is referred to as a no-line trifocal?

A no-line trifocal lens is commonly known as a progressive lens. This type of lens provides a smooth, seamless transition between multiple optical powers designed for seeing at various distances—far, intermediate, and near—without any visible lines on the lens surface. The design allows the wearer to have a more natural vision as they shift their gaze from one distance to another, making it a popular choice for individuals who need correction for presbyopia.

In contrast, other lens types, such as bifocal lenses, contain a distinct line separating two different optical zones, while lined lenses also feature these visible lines. Single vision lenses, on the other hand, have only one optical power throughout the lens and do not accommodate multiple vision needs across different distances. Therefore, the term "no-line trifocal" effectively highlights the advantage of progressive lenses in providing a more aesthetically pleasing and functionally versatile option for vision correction.