Punctal plug
Medical device to block the tear ducts / From Wikipedia, the free encyclopedia
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A punctal plug, also known as tear duct plug or lacrimal plug, is a small medical device that is inserted into the tear duct (puncta) of an eye to block the duct. This prevents the drainage of liquid from the eye. They are used to treat dry eye.
Artificial tears are usually still required after punctal plug insertion.[1]