Our eyes tear up for various reasons. The most common, known as basal, are involuntary tears that are continuously being released to keep the cornea moist. Then there are reflex tears that are shed when eyes are exposed to irritants like dust or onion vapor. And finally, emotional or psychic tears that pour out when one is experiencing extreme happiness or grief.While all tears comprise of enzymes, antibodies and oils mixed in with salt water, the composition and viscosity of each kind is unique. In a previous study performed on reflex and emotional tears, scientists discovered that the former comprised primarily of water while the latter included several chemicals, including one that helps reduce pain.Hence, it would make sense that the tears composed of the same chemicals would look identical even under the scrutiny of a microscope. However, as Dutch photographer Maurice Mikkers recently discovered, that is not the case.
The photographer who said he wanted to relate scientific knowledge to the "real world" began by recruiting friends who were willing to shed some tears for him. The volunteers were free to choose their method to get watery eyed. They could eat hot peppers, gaze into a fan, chop onions or think of something that would incite tears of joy or grief.