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| Artificial tear ： ウィキペディア英語版 |
Artificial tears
Artificial tears are lubricant eye drops used to treat the dryness and irritation associated with deficient tear production in keratoconjunctivitis sicca (dry eyes).〔
〕 They are also used to moisten contact lenses and in eye examinations.
Artificial tears are available over-the-counter. Artificial tears are supplemented with other treatments in moderate to severe forms of dry eyes.
==Chemistry==
Preparations contain carboxymethyl cellulose, polyvinyl alcohol,〔 hydroxypropyl methylcellulose〔 (a.k.a. HPMC or hypromellose), hydroxypropyl cellulose〔 and hyaluronic acid (a.k.a. hyaluronan, HA) They contain water, salts and polymers but lack the proteins found in natural tears. Patients who use them more frequently than once every three hours〔 should choose a brand without preservatives〔 or one with non-irritating preservatives.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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