The complete diagnosis of thyroid associated orbitopathy (TAO) comprises endocrinological and ophthalmological assessment of patients. This approach facilitates classification of patients and qualification of patients for the proper treatment of eye changes. The aim can be obtained by assessment of severity and activity of the disease. One can distinguish at least 4 clinical situations (1. severe and active TAO, 2. severe and inactive TAO, 3. non-severe and active TAO, 4. non-severe and non-active TAO). Methods of reestablishing euthyreosis are proposed in this article, in relation to disease activity and severity of the disease. The two case-reports are described in order to express proposed theses.