In response to the COVID19 pandemic, European Norms regarding face masks are now published free of charge. This link pertains to personal eye protection:
https://www.hzn.hr/UserDocsImages/pdf/HRN%20EN%20166_2002.pdf
Another tip in case of using this as a last-resort: PET bottle can also be a source of a fairly strong PET sheet! The curvature might not be idea, but thermal treatment could help there.