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He described photographs of an infected dairy worker in another state: “Apparently, the conjunctivitis that this is causing is not a mild one, but rather ruptured blood vessels and bleeding conjunctiva.”

These organoids mimic the function of the actual human conjunctiva, a tissue involved in tear production.

“We know that cells in the conjunctiva have ACE2 receptors on them — which are the bindings sites for the spike protein on COVID,” he said.

Pink eye, known to doctors as conjunctivitis, describes inflammation of the conjunctiva—a thin, transparent mucous membrane that covers the white part of the eyeball.

The hood graft procedure involved "a flap of conjunctiva - the pink of the eye - secured over the cornea, which allows the cornea to heal itself", said Dr Williams.