Viral Conjunctivitis Rates Unchanged Before and During the COVID-19 Pandemic in an Ophthalmology Clinic

Background: Millions of acute conjunctivitis cases occur in the United States annually. The impact of COVID-19 mitigation practices on viral conjunctivitis incidence within ophthalmology clinics has not been reported. We hypothesized that viral conjunctivitis rates would decrease with implementation of such practices.

Methods: A retrospective chart review was conducted at a single academic center's ophthalmology clinics. Electronic health record data was queried using ICD-10 diagnostic codes to include 649 patients aged 2-97 with viral, bacterial, or allergic conjunctivitis diagnosed either before (6/1/2018-5/1/2019) or during (6/1/2020-5/1/2021) COVID-19 precautions. Conjunctivitis rates per ophthalmology clinic visit were compared using rate-ratio analysis. Logistic regression evaluated the effects of age, sex, and race among those with conjunctivitis.

Results: A total of 66,027 ophthalmology clinic visits occurred during the study period. Viral conjunctivitis rates per visit did not significantly change after enacting COVID-19 mitigation strategies, but allergic conjunctivitis rates significantly increased (viral: RR 0.82, 95% CI 0.51 to 1.31, p=0.408; allergic: RR 1.70, 95% CI 1.43 to 2.03, p<0.001). When controlling for time, younger age (≤ median age 55) (p=0.005) and Caucasian race (p=0.009) were associated with higher viral conjunctivitis frequency.

Conclusion: Contrary to trends reported in emergency departments, viral conjunctivitis rates within an ophthalmology clinic did not significantly change after COVID-19 mitigation strategies, though allergic conjunctivitis rates increased. Patients' avoidance of emergency departments during the pandemic may have contributed. Further investigation is required to explore variation in ophthalmology patient populations and needs based on care setting.