Dry eye, a global problem affecting more than 30 million people in the U.S. alone, occurs when the eye does not produce tears properly or when the tears are not of the correct consistency and evaporate too quickly.
[Note: this is an older, but still potentially useful, article from the RPB archives.]
David A. Sullivan, Ph.D.
Associate Professor of Ophthalmology
Schepens Eye Research Institute
Harvard Medical School...