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Effect of tear additives on the shear stress and normal stress acting on the ocular surface

McElwain, Sean, Jones, Malcolm B., Fulford, Glenn, Please, Colin P., & Collins, Michael J. (2007) Effect of tear additives on the shear stress and normal stress acting on the ocular surface. In Jacobs, Peter, McIntyre, Tim, Cleary, Matthew, Butsworth, David, Mee, David, Clements, Rose, et al. (Eds.) 16th Australasian Fluid Mechanics Conference, 2-7 December 2007, Crown Plaza, Gold Coast, Australia.

Abstract

Based on lubrication theory, an elastohydrodynamic model of the human tear film is presented. Using this model we investigate the effect altering the viscosity of the tears has on the stresses acting on the cornea during a blink. In order to model the compliant cornea and eyelid surface, a mattress model is employed. This model is then coupled with the lubrication model of the tear film leading to a one-dimensional nonlinear partial differential equation governing the fluid pressure in the lubrication film. The differential equation is solved numerically using a finite-difference scheme. The results indicate that typical tear additives will lead to an increase in the shear stress acting on the cornea. This in turn may effect the shedding rates of corneal epithelial cells. The model is also of use in predicting the drag force the eyelid exerts on a contact lens and in assessing how tear additives may effect the movement and rotation of the contact lens.

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ID Code: 12118
Item Type: Conference Paper
Additional Information: For more information, please refer to the conference website (see hypertext link) or contact the author.
Additional URLs:
ISBN: 9781864998948
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300)
Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300) > Vision Science (111303)
Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > OPTOMETRY AND OPHTHALMOLOGY (111300) > Optical Technology (111302)
Divisions: Current > Research Centres > Centre for Health Research
Current > QUT Faculties and Divisions > Faculty of Health
Current > Institutes > Institute of Health and Biomedical Innovation
Past > Schools > Mathematical Sciences
Current > Schools > School of Optometry & Vision Science
Copyright Owner: Copyright 2007 The University of Queensland
Copyright Statement: Copyright c 2007 The University of Queensland, Brisbane. This material is copyright but may be reproduced for the fair dealing purposes of research and study and any other purposes permitted by the Copyright Act 1968. Responsibility for the content of these papers rests upon the authors and not The University of Queensland. Data presented and conclusions developed by the authors are for information only and are not intended for use without independent substantiating investigation on the part of the potential user.
Deposited On: 18 Jan 2008
Last Modified: 29 Feb 2012 23:40

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