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Eye Wear free resource MedlinePlus Health Information https://medlineplus.gov/eyewear.html
free resource PubMed Central https://www.ncbi.nlm.nih.gov/pmc/articles/pmid/34236491/
subscription/membership/fee required Springer https://dx.doi.org/10.1007/s00347-021-01452-y
free resource Europe PubMed Central https://europepmc.org/abstract/MED/34236491