What is the answer to the riddle "What always works with something in its eye"?

A needle works with something in its eye, according to the site Riddles Brain Teasers. The "something" refers to thread, which must be in the eye of the needle in order for it to sew.

Riddles are not unique to any one culture, but they are presented and solved throughout the world. Often used as a challenge or test, in some cases as a means to determine life or death, riddles likely gave rise to the invention of puzzle and board games. Riddles have been found by archaeologists on temple walls around the world, and the clever questions continue to entertain people around the globe.