After having severe dry eyes for years, I finally have my answer!  I saw several doctors but none of them mentioned Vit. A.  They all wanted me to take expensive prescription drops that made my eyes burn like fire!  Vitamin A is fat soluble which is only one of the vitamins celiacs have trouble absorbing.  I  was desperate and had 24,000 Beta Carotene that we take if we are around a sick person.  My eyes felt so much better!  I took 3 days and then thought I should have the blood level checked.  It was a great number: 77.  Normal is 40-100.  So, the level is good and I felt at least 90% better!  I read that a lot of celiacs need 10,000 per day so I am taking that nearly every day.  I will get retested later in the fall when I recheck Vit.D.  The doctors that know about nutrition are saying low Vit. D can lead to dementia as well as many other problems.  It is good to test it in the fall before all the dangerous germs hit people.