| http://www.w3.org/ns/prov#value | - The normal human tear film is about 98% water (with dissolved minerals or "salts" including sodium, potassium and calcium), about 1% lipid (an oily film that reduces evaporation, reduces tear breakup, and helps the lids glide smoothly over the corneal surface), and about 1% mucopolysaccharide (the mucus" component, long water-soluble molecules that further stabilize the tear film, and promote adh
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