ELECTROCHROMIC SINGLE AND TWO-CORE VIOLOGENS AND OPTICAL ARTICLES CONTAINING THEM

摘要

The present invention relates to a group of novel electrochromic materials. More specifically, it relates to electrochromic materials based on either single or two-core viologen systems and the use of these viologen systems as a variable transmittance medium for the manufacture of an optical article, such as an ophthalmic lens.