Ocular Autoimmune Systemic Inflammatory Infectious Study (OASIS) - Report 1: Epidemiology and Classification

Purpose: To report the epidemiology and classification of ocular inflammation at a tertiary eye care center in Singapore.Methods: Retrospective cohort study of the clinical records of consecutive new cases from the Ocular Autoimmune Systemic Inflammatory Infectious Study (OASIS) database from 2004-2015.Results: A total of 2200 patients were studied from the OASIS database. The most common anatomic diagnosis was anterior uveitis (55.9%), posterior uveitis (17.5%), panuveitis (9.6%), and intermediate uveitis (4.7%). In addition, scleritis (6.1%), keratouveitis (2.8%), retinal vasculitis (2.2%), and episcleritis (1.2%) were observed. Etiology was established in 65.1%, with 35.2% of patients associated with non-infectious etiologies. The most common etiologies found were presumed tuberculosis (7.2%), followed by cytomegalovirus infection (6.9%), herpetic infection (6.3%), HLA-B27-associated anterior uveitis (4.2%), and ankylosing spondylitis (3.8%).Conclusions: The pattern of ocular inflammation in Singapore has similarities with both Western and Asian populations. Anterior uveitis was the most common, with non-infectious etiologies being slightly more common than infectious etiologies.