There are two lacrimal puncta in the medial (inside) portion of each eyelid.

Normally, the puncta dip into the lacrimal lake.

Together, they function to collect tears produced by the lacrimal glands.

The fluid is conveyed through the lacrimal canaliculi to the lacrimal sac, and thence via the nasolacrimal duct to the inferior nasal meatus of the nasal passage.

This article incorporates text in the public domain from page 1028 of the 20th edition of Gray's Anatomy (1918)