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.
5. Cancel. Ophthalmology is the study and treatment of diseases in the eye, usually through surgical methods to correct cataracts, vision impairments or abnormal growths. Find out what an ophthalmologist does with information from a practicing optometrist in this free video on eye health.ancel. Ophthalmology is the study and treatment of diseases in the eye, usually through surgical methods to correct cataracts, vision impairments or abnormal growths.