Among the parts that make up the human eye are the lens (which works much like a camera lens), iris, pupil, and retina. This eMedTV channel offers articles on a number of topics related to the eyes, including dry eye relief and cataract surgery.

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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.

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