The OptoDrum is a convenient, automated, fast, and objective in-vivo tool to screen for visual dysfunction and disease progression. OptoDrum automatically determines the visual abilities of mice and rats. Based on the optomotor reflex, the OptoDrum’s fully automated and reliable analysis finds visual acuity and contrast sensitivity quickly and objectively. Applications – OPTHALMOLOGY, PHARMACOLOGY, DISEASE MODELS, TOXICOLOGY, PHENOTYPING.