[Semiology and classification of uveitis]

Defined as an intraocular inflammation, uveitis may be linked to a systemic disease or represent an isolated entity. Screening for associated extra-ocular manifestations is mandatory in uveitis patients. The localisation of inflammation may be uni- or bilateral, anterior, intermediate or diffuse (panuveitis). Other main elements of the evaluation are the acute or chronic mode and the detection of a granulomatous presentation. In some cases, the examination of intraocular structures may be enough for the diagnosis of uveitis. When a correct approach is taken to the diagnosis of uveitis, causes are identified in approximately 50% of cases and presumed in 25% of patients; in one-fourth of cases, the origin of inflammation remains idiopathic.