Have you ever wondered why we cry? If so, you are not alone. People have asked this questions for hundreds of years.
One major breakthrough occurred in the 17th century when a Danish scientist discovered the lacrimal gland. The lacrimal gland is responsible for producing the watery or aqueous component of our tears. The tear film also contains a mucus component produced by goblet cells on the white part of the eye and an oily component produced from the meibomian glands at the edge of our eyelids. These 3 components are joined by enzymes, lipids, metabolites and electrolytes to make up the tear film that coats and lubricates our eyes.