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tear pumping |
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tear pumping The mechanism involving blinking, which acts to bring fresh tears with oxygen and nutrients to the cornea behind a contact lens, and pumping stale tears containing carbon dioxide, lactic acid and other waste products from beneath the lens. It occurs most readily with hard contact lenses (between 14% and 20% of the tear volume is exchanged with each blink) and to a much smaller extent with soft lenses (between 1% and 5% of the tear volume is exchanged with each blink). See hypoxia; oxygen transmissibility. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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