Au contraire re: whether or not masks protect either the wearer of others.
The several countries with a previously existing or newly acquired culture of wearing mask have had a FAR lower incidence of COVID 19, and far lower number of deaths per capita compared to the USA, which FAR exceeds any other country:
https://coronavirus.jhu.edu/map.html Masks, or rather the failure to wear them, are of course just one of the reasons.
Evidence continues to accumulate of their benefit to both wearers and others:
https://pubmed.ncbi.nlm.nih.gov/32294341/https://pubmed.ncbi.nlm.nih.gov/24229526/https://doi.org/10.1101/2020.04.19.20071779https://pubmed.ncbi.nlm.nih.gov/32232986/https://pubmed.ncbi.nlm.nih.gov/32371934/https://pubmed.ncbi.nlm.nih.gov/19522650/Facebook and other social media assertions that cloth face masks, such as are recommended for the general public, cause lower oxygen levels and higher carbon dioxide levels are without any published data to back up those claims.
For glasses fogging prevention, wiping a drop of shaving cream on the lenses works well; antifog sprays are also available from the eye wear stores, or the usual mail order sources.
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