PMID: 3749253Jun 1, 1986Paper

Forces developed beneath hydrogel contact lenses due to squeeze pressure

Physics in Medicine and Biology
D K Martin, B A Holden

Abstract

The hydrodynamic squeeze pressure in the fluid thin film beneath hydrogel contact lenses fitted onto an axisymmetric model eye were measured. These pressures were due to the contact lens relaxing after deformation by an applied force of similar magnitude to the human eyelid force. The distribution of pressure for contact lenses typically fitted to human eyes was negative with respect to atmospheric pressure at the corneal apex and became less negative at the corneo-scleral limbus. The force that the contact lens applied to the cornea was determined by integrating the pressure distribution from the corneal apex to the limbus. This force varied from 6.0 X 10(-4) N to -7.8 X 10(-1) N depending on the thickness, elastic modulus and bearing relationship of the contact lens. An expression was derived to determine the pressure developed beneath the annulus of the hydrogel contact lens overlapping the cornea, in terms of the measured force over the cornea beneath the contact lens and the chord diameters of the contact lens and cornea. It was found that the deformation of hydrogel contact lenses on the model eye did not follow a linear elastic shell theory.

References

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Citations

Mar 30, 2013·Contact Lens & Anterior Eye : the Journal of the British Contact Lens Association·James S WolffsohnUNKNOWN GP Consensus Group
May 30, 2002·Clinical & Experimental Optometry : Journal of the Australian Optometrical Association·Paul EricksonSteve G Zantos
Aug 7, 2013·Contact Lens & Anterior Eye : the Journal of the British Contact Lens Association·Chang Rae RhoMan Soo Kim
Jan 27, 2009·Contact Lens & Anterior Eye : the Journal of the British Contact Lens Association·James S WolffsohnAmritpreet K Basra
Nov 2, 2006·Journal of Biomedical Materials Research. Part B, Applied Biomaterials·Anne E MeyerMasood Chowhan
Mar 13, 2015·Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)·Kirsten Hamilton-Maxwell, Nicole King
Jun 19, 2010·Clinical & Experimental Optometry : Journal of the Australian Optometrical Association·Luigina SorbaraTrefford Simpson
Aug 1, 1996·Journal of Biomechanical Engineering·G M Funkenbusch, R C Benson
Apr 22, 1999·Journal of Biomechanical Engineering·G M Funkenbusch, R C Benson
Apr 14, 2010·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Graeme YoungSuzanne Efron
Apr 15, 2016·Eye & Contact Lens·Wan ChenJianhua Wang
Jun 13, 2001·Current Eye Research·A Chauhan, C J Radke
Jun 6, 2014·Optometry and Vision Science : Official Publication of the American Academy of Optometry·Graeme Young
Mar 30, 2021·Contact Lens & Anterior Eye : the Journal of the British Contact Lens Association·James S WolffsohnFiona Stapleton
Jul 22, 2021·Mathematical Medicine and Biology : a Journal of the IMA·Daniel M AndersonPadmanabhan Seshaiyer

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