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.
Anophthalmia, (Greek: Î±Î½ÏÏÎ¸Î±Î»Î¼Î¿Ï, without eye), is the medical term for the absence of one or both eyes. Both the globe (human eye) and the ocular tissue are missing from the orbit.