Marco Brightness Acuity Tester This simple, hand-held device measures the effects of glare, and features modular solid-state design, LED illumination system, and three variable light intensity settings. Features Conveniently measures the effects of glare without leaving the exam room New modular, solid-state design accommodates most standard rechargeable handles State-of-the-art LED illumination system provides a better, more efficient light source Three variable light intensity settings simulate various glare conditions Evaluates tinted lenses, sunglasses, and anti-reflectives to quantify improvement in glare disorders Effectively evaluates macular photo stress testing