title: A lubrication theory model of tear exchange under a soft contact lens.
abstract: Tear exchange due to squeezing of a soft contact lens onto the cornea by the lid is calculated from lubrication theory. The theory predicts that for a normal blink and the usual tear film thickness (8 to 10 microns) there will be 10 to 20% tear exchange at each blink.
mesh_terms: D003263:Contact Lenses, Hydrophilic; D003315:Cornea / Q000502:physiology; D005143:Eyelids / Q000502:physiology; D006801:Humans; D008153:Lubrication; D008954:Models, Biological; D055585:Physical Phenomena; D010825:Physics; D012018:Reflex; D013666:Tears / Q000502:physiology*