The main organization for Ophthalmology in the United States is the American Academy of Ophthalmology. Their web site has useful information on many topics about eye health and can even answer some questions about laser refractive surgery - LASIK.
Another organization is the American Society for Cataract and Refractive Surgery. More good information is available there.
The professional certifying organization is the American Board of Ophthalmology. Through their umbrella organization, the American Board of Medical Specialties, you may determine whether a physician in the US is Board Certified or not, free of charge.