This video shows a closeup of a punctal plug. These plugs are placed in the punctum of the eye to decrease tear drainage and help with dry eye. They come on an applicator (pictured here at the beginning of the movie) that the ophthalmologist uses to help insert them.
This silicone stopper is a temporary solution, but can be helpful with extream dryness. They are small and difficult to see, and will often fall out after a few months, so it’s recommended that you don’t rub the medial corners of the eye if it can be helped. A total of four plugs can be placed if needed: as each eye has an upper and a lower punctum.
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punctalplug.wmv (2.9 meg, Windows video file)