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 or osteopathic physician who specializes in the medical and surgical care of the eyes and the prevention of eye disease. Ophthalmologists are licensed by state regulatory boards to practice medicine and surgery, as well as deliver routine eye care.