dry eye

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Keratoconjunctivitis characterized by decreased tear flow and thickening and hardening of the cornea and conjunctiva.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun keratoconjunctivitis sicca, an eye disease caused by decreased tear production.
• noun idiomatic An eye which is not crying, i.e. someone emotionally unmoved.