[Differential diagnoses of dry eye syndrome and blepharitis].

Dry eye syndrome and blepharitis are diseases that affect many patients from different age groups. There is not only a great variability in the manifestation between patients but they also show a mixture of associated symptoms. Thus, very different ocular and systemic diseases have to be included in the differential diagnosis of a primary dry eye disorder. This article provides a structured overview of these differential diagnoses and their characteristic appearance as well as the pitfalls and therapeutic options.