article_snippet: The retro-reflective materials on The glasses are designed to reflect light back at the same angle as it arrived - which is useful only during flash photography (above how retro-reflective materials work on the glasses)
article_snippet: Retro-reflective materials
article_snippet: While most surfaces reflect light by diffusing or scattering it in all directions, retro-reflective materials are specially designed to reflect light back at the same angle as it arrived - which is useful during flash photography.
article_snippet: Above, an illustration for how retro-reflective materials in the glasses work .
article_snippet: The retro-reflective materials on the glasses are designed to reflect light back at the same angle as it arrived - which is useful only during flash photography.