Some patients who test positive for SARS-CoV-2 (COVID-19) have presented with conjunctivitis or conjunctival congestion, and ocular secretions have been observed in patients with positive SARS-CoV-2 serology. These observations raise the possibility that SARS-CoV-2 can cause conjunctivitis, but the relationship remains unclear because few studies have directly compared the two. The ocular system has also been proposed as a potential route of viral transmission.