Tears Help Us See
The most basic function of tears is that they enable us to see. Literally. Tears not only lubricate our eyeballs and eyelids, they also prevent dehydration of our various mucous membranes. No lubrication, no eyesight. Writes Jerry Bergman: "Without tears, life would be drastically different for humans—in the short run enormously uncomfortable, and in the long run eyesight would be blocked out altogether."