Ok, so this may seem a non-invasive testing method for SARS-CoV-2, @jtd
I remembered the following discussion on similar topic from another post, during our initial discussion @vvcstemplay talking about
Interestingly, there is another story also inside this. The patient’s worsening red eye and repeated visits to ophtalmolgoists and negative testing of typical eye tests did not lead to a decision to test for SARS-CoV-2. It was a decision governed by the non-healthcare body, as their testing recommendations expanded for geographical locations (and the patient had an expanded travel history). It was only then the health care authorities decided to do the NP swab test and then it was positive for SARS-CoV-2. This is also a case study for how the testing recommendations change and therefore the number of positive cases spike up.
Nevertheless, repeated results, or rather repeated findings of such symptons easily visible to naked eye can confirm to use this as detection method of coronavirus. (Although in this case also it is about the red eye and watery discharge cases). An eye for an eye!