Corning Glass Works has recently developed a series of inorganic bulk photochromic materials. The present paper is concerned with the results of an extensive laboratory investigation of their properties. It is shown that the fatigueless reversibility and the optical characteristics of these glasses hold definite. promise for several applications.
G. K. Megla, "Optical Properties and Applications of Photochromic Glass," Appl. Opt. 5, 945-960 (1966)