For the tech savvy! Karen Walker Blue Blockers contain blue light filtering lenses that act as a barrier between your eyes and the potentially harmful blue light emitted by the digital devices such as smart phones, laptops and TVs that we use every day. Taking a selection of classic optical styles, from sleek metals to smart acetates, and enjoy the blue light filter or have your prescription fitted. Practical ergonomic design means these glasses are lightweight to wear while adjustable nose pads on most provide a universal fit.