Did your eye dry? If yes, how to avoid from our eyes got dry? Wait, what is Dry eye??
Dry eye is a group of conditions each characterized by loss of water from the tear film sufficient to increase the amount of salt relative to the amount of water. As a result, the tear film becomes too concentrated, and as it does, its “osmolarity” increases. I think most of us will remember “osmosis” from our high school chemistry class. Well, that’s what happens in dry eye–when the tear film becomes more concentrated it pulls water out of the surface of the eye, making it dry.
If you have dry eye you experience sandy-gritty irritation or burning in your eyes that generally gets worse as the day goes on.
There are two basic ways that someone can get dry eye–decreased tear production or increased tear film evaporation. Tear production can go down from conditions like rheumatoid arthritis or Sjögren’s syndrome, or from any condition that decreases sensation on the surface of the eye–things like diabetes, long-term contact lens wear, corneal surgery, LASIK, trauma to the 5th nerve and certain viruses.
Source : Dryeyeinfo.org
no wonder sometimes our eyes always dry..