American Academy of Ophthalmology - search by location, choice of specialty, and/or last name worldwide.
American Optometric Association - doctor locator search, U.S. only.
OcuSource Vision Resources - a growing database of doctors, therapists, agencies, organizations, and support groups worldwide.
Retina/Vitreous Doctors - worldwide search by state, area code, zip code, or country for doctors who are members of the Vitreous, Retina, and Macula Societies.
Vision RX - search by zip code and specialty, U.S. only.
Vision Connection - geographic search tool also includes rehabilitation services, educational institutions, government agencies, and other resources.