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Collyrium - Definition



Definition


Collyriums are medicinal substances in the form of eye drops, to be applied on the conjunctiva, which covers the white part of the eye. Normally, it is recommended to put the drops at an internal angle of the eye, open, with the head lightly tilted back and the other hand pulling on the lower eyelid. Collyriums are able to treat various afflictions of the eye, such as conjunctivitis, as well as bacterial infections when they contain antibiotics. They may also be composed of corticoids, and anesthetic or healing solutions. Collyriums may sometimes be merely "artificial tears" to moisturize the eye or clean it. Some are used to permit research of an eye condition such as fluorescein which colors the eye, or mydriatic collyriums which dilate the pupil. The majority of collyriums expire less than one month after opening, hence the existence of single-dose solutions.
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