Are tears sweat?
Also, MacPherson adds, "The actual glands that secrete them are totally different. Your body is covered with microscopic sweat glands, whereas with tears, the lacrimal glands are the size of an almond up in the superior lateral corner of your eye." Are tears and sweat similar? Tears and sweat both have approximately the same salinity, but sweat contains oils and hormones that could irritate the eyes. The sweat that runs into your eyes has also run over your hair and forehead first, so it has had plenty of opportunity to pick up dust and grime along the way.