Dryness of the eyes and mouth can have other causes, which include:
- inflammation of the oil-producing glands in your eyelids (blepharitis), which causes excessive evaporation of the tear film
My Schirmer's test indicated eyes that were only slightly dry. But then, I don't have this problem during the daytime -- only at night. How long should I continue the blepharitis management protocol, without improvement, before considering the diagnosis may have been wrong? (I have other autoimmune diagnoses, but as far as I know, my tests for Sjogren's have been negative.)