Tears reveal more than emotions. Discover the science behind crying, its biological purpose, and the surprising benefits of ...

There are different types of tears, per the AAO. Basal tears are present in the eye at all times to help lubricate and ...

Scientifically, tears are divided into three different categories based on their origin: emotional, basal, and reflex. Mikkers sought to examine tears from a number of subjects to see if they ...