Optometry is a health care profession concerned with eyes and related structures, as well as vision, visual systems, and vision information processing in humans, optometrists are also qualified to diagnose and treat eye diseases such as infections and glaucoma. Like most professions, optometry education, certification, and practice is regulated in most countries. Optometrists and optometry-related organizations interact with governmental agencies, other health care professionals, and the community to deliver eye and vision care.