• Carr T, Ophthalmic Medical Assisting, 3rd Edition, San Francisco: American Academy of Ophthalmology; 2002.
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    Comprehensive Ophthalmology, Cornea/External Disease

    Another red-eye condition commonly presenting to the primary care physician arises from abnormalities of the tear drainage system. Under normal conditions, tears are produced by the lacrimal gland and drain into the nose by way of lacrimal drainage structures: the puncta, canaliculi, common canaliculus, lacrimal sac, and nasolacrimal duct.