ABSTRACT
PURPOSE: As ophthalmic side effects of messenger RNA (mRNA)-based COVID-19 vaccination are not well understood, it is crucial to document and report such instances should they occur. METHODS: In this observational case series, we report nine patients (55.6% male, mean age 58.9) who received either the BNT162b2 (Pfizer-BioNTech) or mRNA-1273 (Moderna) COVID-19 vaccinations from January to June of 2021, and presented with symptoms of keratitis within 14 days. All patients underwent slit-lamp examination and histories were taken. RESULTS: Most subjects (66.7%) had a history of corneal inflammatory diseases and resolved under antiviral and/or steroidal treatment. Patients who reported symptoms after their second vaccine dose presented earlier than those who reported symptoms after the first dose (mean 4.4 days vs 10.5 days, respectively). CONCLUSIONS: The immunological reaction following mRNA-based COVID-19 vaccinations may trigger new-onset or reactivation of keratitis, though causality cannot be proven. Despite its rarity, clinicians should be aware of this possible complication and be prepared to treat.
