Epidemiology of Uveitis in a tertiary care centre in Portugal

Purpose: Evaluate the prevalence and incidence, demographic characteristics, anatomical classification, concomitant complications and treatment of uveitis, as well as its association with systemic diseases in the northern Portuguese population referred to a tertiary care centre (São João Hospital, Porto).Methods: A retrospective observational study of 545 consecutive uveitis cases was performed between 12th April 2012 and the 26th October 2017. Uveitis was classified according to Standard Uveitis Nomenclature, while aetiology and complications were diagnosed by specific clinical and laboratory testing.Results: Prevalence was calculated to be 12,4 cases per 100,000 people while incidence was 3.9 cases per 100,000 people annual incidence. The ratio of females to males was 1.32:1 and the mean age at diagnosis was 47,86 years. Anterior uveitis was the most common classification making up 47.5%, followed by non-infectious posterior uveitis 18,0%, infectious posterior uveitis 8,4%, intermediate uveitis 5,5% and panuveitis 4,2%. Extra-uveal entities made up the rest of the causes (16.4%). In terms of aetiology, the majority of uveitis was idiopathic (32,1%) followed by axial spondylarthritis (12.1%), Behçet's disease (8,8%), sarcoidosis (6,1%), tuberculosis (5,5%), herpes (5,1%), toxoplasmosis (3,1%) among other less frequent causes.Conclusion: In our referral region, 72% of uveitis cases were correctly identified surpassing other studies. There was a higher rate of intermediate uveitis and lower number of panuveitis cases when compared to a previous Portuguese study. Extensive monitoring of the development of uveitis by international multicentre prospective studies could be useful for increasing practitioner awareness and diagnostic approach.