Lacrimal Duct Obstructions
《英文msh詞典》Lacrimal Duct Obstructions
[入口詞] Lacrimal Duct Obstructions
[主題詞] Lacrimal Duct Obstruction
[英文釋義] Interference with the secretion of tears by the lacrimal glands. Obstruction of the lacrimal sac or nasolacrimal duct causing acute or chronic inflammation of the lacrimal sac (DACRYOCYSTITIS). It is caused also in infants by failure of the nasolacrimal duct to open into the inferior meatus and occurs about the third week of life. In adults occlusion may occur spontaneously or after injury or nasal disease. (Newell,Ophthalmology: Principles and Concepts,7th ed,p250)