Well, there's a disease called keratoconjunctivitis sicca, which means eyes so dry there is irritation to the cornea. And there's the "sicca syndrome," which is dryness all over - scanty tears, saliva, and other body fluids, which sometimes is part of the spectrum of collagen disease (including lupus), or Reynaud's Phenomenon, or a fancier one called Sjogren's syndrome. But dry eyes by themselves might be completely benign, whereas the others are real diseases...I'm sure the symptom has a Latin name, but (as a cardiologist) I can't help much more than that.