Author: Panos Maghsoudlou, NIHR Academic Clinical Lecturer in Ophthamology School of Cellular and Molecular Medicine, University of Bristol

Orlowski Designs LLC/Shutterstock Most people underestimate how much light a pair of sunglasses blocks out. A typical dark pair removes around 80 to 90% of the visible light reaching the eye. Safely looking directly at the Sun requires reducing the light reaching the eye by a factor of around 100,000, meaning roughly 99.999% must be […]