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- Imbert-Fick_law abstract "The Imbert-Fick "law" was invented by Hans Goldmann (1899–1991) to give his newly marketed tonometer (with the help of the Haag-Streit Company) a quasi-scientific basis; it is mentioned in the ophthalmic and optometric literature, but not in any books of physics. According to Goldmann, "The law states that the pressure in a sphere filled with liquid and surrounded by an infinitely thin membrane is measured by the counterpressure which just flattens the membrane." "The law presupposes that the membrane is without thickness and without rigidity...practically without any extensibility." The problem is that a sphere formed by such a membrane and filled with incompressible liquid (water) cannot be indented or applanated even when the pressure inside is zero, because a sphere contains the maximum volume with the minimum surface area. Any deformation necessarily increases surface area, which is impossible if the membrane is inelastic, such as aluminum foil.The actual physical basis of tonometry is Newton's third law of motion: "If you press a stone eyeball with your finger, the finger is also pressed by the stone eyeball."The law is this: Intraocular pressure = Contact force/Area of contactThe law assumes that the cornea is infinitely thin, perfectly elastic, and perfectly flexible. None of these assumptions are true. The cornea is a membrane that has thickness and offers resistance when pressed. Therefore, in Goldmann tonometry, readings are normally taken when an area of 3.06mm diameter has been flattened. At this point the opposing forces of corneal rigidity and the tear film are roughly approximate in a normal cornea and cancel each other out allowing the pressure in the eye to be inferred from the force applied.".
- Imbert-Fick_law wikiPageID "24596774".
- Imbert-Fick_law wikiPageLength "2754".
- Imbert-Fick_law wikiPageOutDegree "14".
- Imbert-Fick_law wikiPageRevisionID "638145232".
- Imbert-Fick_law wikiPageWikiLink Aluminium_foil.
- Imbert-Fick_law wikiPageWikiLink Aluminum_foil.
- Imbert-Fick_law wikiPageWikiLink Biological_membrane.
- Imbert-Fick_law wikiPageWikiLink Category:Pressure.
- Imbert-Fick_law wikiPageWikiLink Compressibility.
- Imbert-Fick_law wikiPageWikiLink Cornea.
- Imbert-Fick_law wikiPageWikiLink Deformation_(engineering).
- Imbert-Fick_law wikiPageWikiLink Incompressible.
- Imbert-Fick_law wikiPageWikiLink Newtons_Third_Law.
- Imbert-Fick_law wikiPageWikiLink Newtons_laws_of_motion.
- Imbert-Fick_law wikiPageWikiLink Ocular_tonometry.
- Imbert-Fick_law wikiPageWikiLink Ophthalmology.
- Imbert-Fick_law wikiPageWikiLink Optometry.
- Imbert-Fick_law wikiPageWikiLink Physics.
- Imbert-Fick_law wikiPageWikiLink Sphere.
- Imbert-Fick_law wikiPageWikiLink Stiffness.
- Imbert-Fick_law wikiPageWikiLink Surface_area.
- Imbert-Fick_law wikiPageWikiLink Tonometer.
- Imbert-Fick_law wikiPageWikiLinkText "Imbert-Fick law".
- Imbert-Fick_law hasPhotoCollection Imbert-Fick_law.
- Imbert-Fick_law wikiPageUsesTemplate Template:Cleanup.
- Imbert-Fick_law subject Category:Pressure.
- Imbert-Fick_law type Article.
- Imbert-Fick_law type Article.
- Imbert-Fick_law type Page.
- Imbert-Fick_law type Quantity.
- Imbert-Fick_law comment "The Imbert-Fick "law" was invented by Hans Goldmann (1899–1991) to give his newly marketed tonometer (with the help of the Haag-Streit Company) a quasi-scientific basis; it is mentioned in the ophthalmic and optometric literature, but not in any books of physics.".
- Imbert-Fick_law label "Imbert-Fick law".
- Imbert-Fick_law sameAs m.080nhbd.
- Imbert-Fick_law sameAs Q6003521.
- Imbert-Fick_law sameAs Q6003521.
- Imbert-Fick_law wasDerivedFrom Imbert-Fick_law?oldid=638145232.
- Imbert-Fick_law isPrimaryTopicOf Imbert-Fick_law.