Introduction: Orbital myositis is an acute or chronic nonspecific idiopathic inflammation of the extraocular muscles of the eye. The main symptoms are pain in the periorbital region, muscle weakness, double images, limited mobility of the eyeball. The etiology of the diseases is not. entirely known. Beside of the basic ophtalmological examination, additional diagnostics are required in order to make a diagnosis. Treatment is individual, since orbital myositis is a rare disease. Aim: Indicate the importance of differential diagnosis in exophthalmos and double images. Method of work: Analisys of patient medical records. Case report: This is a case report of a 56 years old man with exophthalmos, double images, eye pain and myositis as such as idiopathic, nonspecific inflammation of one extraocular muscle. During the clinical processing of the patient, after the exclusion of the other diseases, we focused examination on the changes in the thyroid gland and myositis of the eye. After two years of the treatment, the patient still has double images but in smaller range and they are not continuous.