Photochromic plastic lens and its method of manufacture

摘要

The invention provides a commercially feasible method of manufacturing a photochromic lens on a large scale. The method involves vacuum depositing a photochromic material onto a surface of a plastic lens to form a photchromic depositied lens, and heating the photochromic deposited lens for a time and at a temperature sufficient to allow the photochromic material to permeate the lens.