Scientists create transition lens

TECH DIGEST

In a move that may lead to the next big fashion accessory, a University of Connecticut scientist has perfected a method of creating quick-changing, variable colours in films and displays such as sunglasses. The new technology has also captured the interest of the US military, since soldiers, who need to see clearly in rapidly changing environments, can benefit from the technology.

The process for creating the lenses is also less expensive to manufacturers, compared to previous methods. "This is the next big thing for transition lenses," said Greg Sotzing, a professor of chemistry, UConn's College of Liberal Arts and Sciences, and a member of UConn's Polymer Programme.

The material behind a transition lens is what is called a photochromic film, or a sheet of polymers that change colour when light hits them. Sotzing's electrochromic lenses are controlled by an electric current passing through them, when triggered by a stimulus such as light.

The mixture of polymers used in this lens, says Sotzing, creates less waste and is less expensive to produce than previous mixtures.