TMPRSS2 and Epiphora: The SARS-CoV-2 receptors, including ACE2 and DPP45, and the host proteases for the S protein, including FURIN6 and TMPRSS2, are expressed in the cornea (Fig. 1a), indicating that it is a potential site for SARS-CoV-2 entrance, in agreement with clinical studies showing infected patients’ epiphora, conjunctival congestion, or chemosis21.