Mayo Clinic offers award-winning medical and health information and tools for healthy living.

The National Library of Medicine (NLM), on the campus of NIH in Bethesda, Maryland, is the world's largest medical library. It collects materials in all major areas of the health sciences and to a lesser degree in such areas as chemistry, physics, botany and zoology. The collections stand at 5 million items--books, journals, technical reports, manuscripts, microfilms, photographs and images. Housed within the Library is one of the world's finest medical history collections of old (pre-1914) and rare medical texts, manuscripts, and incunabula.

Guide to eye care, LASIK laser eye surgery, eyeglasses, contact lenses, low vision, eye exams, computer vision syndrome, glaucoma, cataracts, macular degeneration, and other eye problems and diseases.

Aging Eye Journal that provides cataract, glaucoma, macular degeneration, dry eyes and presbyopia related information, including signs, symptoms, treatment, surgery, clinical trials and research

AMO offers the widest range of proven refractive technologies for myopia, hyperopia, astigmatism, presbyopia, cataract, spherical aberration and corneal health.

Extensive knowledge base of medical information on symptoms, diagnosis, and misdiagnosis of more than 20,000 medical conditions. Research causes of your symptoms or research treatments for diseases.