Image Credits:
A brown eye looks towards the camera and blinks.Creative Commons 3.0	Unported (CC BY 3.0)
A macro shot of a mans eye.Videvo.net, Kiril Dobre, Videvo Attribution License.

Sources:
https://science.howstuffworks.com/life/inside-the-mind/emotions/crying1.htm
https://www.sciencedaily.com/releases/2011/01/110106144741.htm