About this document
Understanding Progressive Addition Lenses by S T Toka is a document available to read on EtoBox.
This document discusses progressive addition lenses (PALs). PALs provide comfortable vision at all distances by combining distance and near vision corrections in a single lens without visible lines. They have gained worldwide acceptance for presbyopia correction since 1959. Compared to single vision, bifocal, and trifocal lenses, PALs offer continuous vision across distances without disruptive lines. The document will cover the physiological and technical concepts behind PAL design and evolution.
- Author
- S T Toka
- Language
- EN