the human eye produces three types of tears. Basal tears, which continuously moisten and feed the eyeball. Reflex tears, which are produced when a foreign body enters the eye. And psychic tears, associated with pain or emotion. These have a different chemical composition. They contain very high percentages of manganese and a hormone, prolactin. In the world of natural phenomena, every single thing can be reduced to a formula, but explaining why tears of pain are physiologically different from the others is practically impossible.
