This chemical is primarily used in the development of photochromic lenses, which are lenses that darken upon exposure to ultraviolet (UV) light and return to a clear state when UV light is removed. It is a key component in creating adaptive eyewear, such as sunglasses and prescription glasses, that automatically adjust to changing light conditions, providing comfort and protection to the eyes. Additionally, it is utilized in optical applications, including smart windows and light-sensitive coatings, where controlled light transmission is required. Its ability to undergo reversible color change makes it valuable in various industries, including automotive and architectural design, for enhancing energy efficiency and user convenience.