Name from west to east the four Great Lakes shared by Canada and the US Lake Superior, Lake Huron, Lake Erie, Lake Ontario Name the Great Lake that lies entirely in the boundaries of the US.
Definition of ophthalmology for English Language Learners. medical : the study of the structure, functions, and diseases of the eye.
An ophthalmologist is a medical doctor (M.D.) specializing in eye care. After the completion of four years of undergraduate study, an ophthalmologist must complete four years of medical school and spend a minimum of four years of residency (hospital-based training). An optometrist has a degree of doctor of optometry.