CHANGING TRENDS IN THE ETIOLOGIC DIAGNOSIS OF UVEITIS

Just as different fads that seize the imagination of the general publi c are often carried to excess, so diagnostic or therapeutic fads may t ake over in the practice of medicine. Analysis of 33 surveys of the ca uses of uveitis reported by ophthalmologists over the course of 120 ye ars shows how some diagnoses such as syphilis and tuberculosis fell fr om favor because tests ruled out these diseases, whereas others such a s toxoplasmosis became popular because of the finding of the organism in a few cases by a famous ophthalmic pathologist. Yet others (pars pl anitis, sarcoidosis) were not even causes of disease, but rather merel y descriptive, or the ocular component of a systemic disease whose eti ology and pathogenesis remain unknown. We will examine the waxing and waning of these diagnostic categories and the impressive confidence of some clinicians in their own diagnostic acumen as they made diagnoses often unsupported by objective evidence.