Eye protection will probably provide a small amount of risk reduction.
https://www.idsociety.org/covid-19-real-time-learning-network/infection-prevention/eye-protection/
PAPRs can be very cheap if DIYed.
https://www.youtube.com/watch?v=xfaswOLIHoQ
https://www.youtube.com/watch?v=zj_C4GrxfNM
https://www.viralhelmets.com
I'm skeptical of the eye infection route given the lack of ocular symptoms. Do you have more info on why you consider them high risk?
To be honest, my impression was that it was well known that the eyes were a potential infection route and that this didn't need much other evaluation -- as I understand it risk of infection via rubbing the eyes was one of the main reasons that "don't touch your face" was such prevalent advice early on.
I believe there are studies indicating glasses-wearers have a reduced infection risk (though obviously lots of potential confounds there), that face shields reduce risk if worn with a mask (though some of this may be blocking particles from making direct contact with a mask/filters), etc. but have not done an in-depth evaluation of that topic.
My impression was that eyes were definitely a plausible route, but I find the lack of oculur symptoms a pretty strong argument that it isn't common for covid in particular, and find the glasses evidence better explained by the fact that fogging glasses are a good feedback loop/incentive to wear your mask properly.
glasses evidence better explained by the fact that fogging glasses are a good feedback loop/incentive to wear your mask properly
This could be an interesting thing to study. Anecdotally, I think I've seen more people give 'fogged glasses' as a reason/excuse not to wear a mask, or to pull it right down, than as a reason to fit the mask properly. For some people and some mask types, there seems to be an assumption that air escaping out the top is inevitable.
So, as I understand it there are three main spots on the body where COVID infection typically takes place -- the nose, the mouth, and the eyes. It is relatively easy to obtain a very protective mask for the nose and mouth (n95/p100), but a large majority of people seem to be using masks that do not provide eye protection. How much extra protection can be gained by protecting your eyes?
(Obviously, the degree of protection one might use can vary -- on the low end we might have "wear glasses", while then we might progress further with things like "disposable face shield over mask", "wear a full face respirator rather than nose/mouth only", and then even "full head positive pressure hood" on the very high end.)