What purpose does a lined trifocal lens serve?

A lined trifocal lens is designed to provide clear vision at three distinct focal lengths, which are typically for distance, intermediate, and near vision. The main purpose of this type of lens is to assist individuals who need glasses to see clearly at varying distances. The lined aspect refers to the visible line that separates the different segments of the lens.

This configuration is particularly beneficial for those who may require visual correction for activities such as reading (near vision), using a computer or viewing objects at arm's length (intermediate vision), and seeing things far away (distance vision). By having these three segments, trifocal lenses allow for seamless transitions between different visual requirements, enhancing everyday activities without the need to switch between multiple pairs of glasses.