A method and system of screening and monitoring a person for Alzheimer's disease, Mild Cognitive Impairment, and Lewy Body Dementia (Dementia) using the King-Devick Test are provided including providing a visual display and a timing device； displaying on the visual display one or more series of symbols arranged in a pattern； providing an indication to the person being screened to begin reading aloud the symbols arranged in the pattern； capturing with the timing device the completion time to read the one or more series of symbols arranged in the pattern； comparing the completion time with a baseline time to complete reading the one or more series of symbols； and determining whether the person has an “abnormal” result based on comparing the completion time with the baseline time.
