Ocular Adverse Events Following Coronavirus Disease 2019 Infection: A Self-controlled Case Series Study from the Entire Korean Population

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This study aimed to assess the risk of ocular adverse events, including retinal artery occlusion (RAO), retinal vein occlusion (RVO), noninfectious uveitis (NIU), noninfectious scleritis (NIS), optic neuritis (ON), ischemic optic neuropathy (ION), and ocular motor cranial nerve palsy (OMCNP), after coronavirus disease 2019 (COVID-19) infection. Population-based self-controlled case series (SCCS). The study included patients from the entire Korean population of 52 million who experienced incident RAO, RVO, anterior NIU, nonanterior NIU, NIS, ON, ION, or OMCNP between January 1, 2021, and October 29,2022. This nationwide SCCS utilized data from the Korea National Health Insurance Service and the Korea Disease Control and Prevention Agency. The risk period after infection was defined as up to 24 weeks after COVID-19 infection. Conditional Poisson regression was used to calculate the relative incidence rate ratios (IRRs) for RAO, RVO, anterior NIU, nonanterior NIU, NIS, ON, ION, and OMCNP during the designated risk periods. The IRRs for RAO, RVO, anterior NIU, nonanterior NIU, NIS, ON, ION, and OMCNP during the risk periods. The study included 9336, 103362, 201010, 25428, 23744, 3026, 69933, and 16335 cases of incident RAO, RVO, anterior NIU, nonanterior NIU, NIS, ON, ION, and OMCNP, respectively. The IRRs (95% confidence interval) during the early risk period (1-8 weeks) were 0.94 (0.83-1.07), 1.01 (0.97-1.04), 1.00 (0.98-1.03), 0.96 (0.90-1.03), 1.00 (0.94-1.07), 0.97 (0.81-1.17), 0.97 (0.93-1.01), and 1.02 (0.94-1.11), respectively. In the late risk period (9-24 weeks), the IRRs were 1.02 (0.92-1.12), 1.01 (0.98-1.04), 1.01 (0.99-1.03), 1.02 (0.97-1.08), 1.02 (0.97-1.08), 0.99 (0.85-1.15), 1.02 (0.99-1.06), and 0.97 (0.90-1.03), respectively. Stratified analyses showed that in patients with a history of cerebro-cardiovascular disease, the risk of RAO increased during the late risk period, with an IRR (95% confidence interval) of 1.19 (1.02-1.40). The risk of incident RVO, anterior NIU, nonanterior NIU, NIS, ON, ION, or OMCNP did not increase after COVID-19 infection. The risk of incident RAO increased only in individuals with preexisting cardio-cerebrovascular disease. Proprietary or commercial disclosure may be found in the Footnotes and Disclosures at the end of this article.