Dynamics of tear film deposition and draining McElwain, D. L. S; Jones, M. B; Please, C. P; ...

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McElwain, D. L. S ; Jones, M. B ; Please, C. P ; Fulford, G ; Roberts, A. P ; Collins, M. J
tear film; film deposition; film rupture
This paper investigates the deposition of the tear film on the cornea of the human eye. The tear film is laid down by the motion of the upper eyelid and then subsequently flows and thins. Of particular interest is the stability of the tear layer and the development of dry patches on the cornea. While there has been significant research on the behaviour of tear films between blinks, this paper focuses on understanding the mechanisms which control the shape and thickness of the deposited film and how this affects the subsequent film behaviour. Numerical and analytical methods are applied to a lubrication model which includes the effects of surface tension, viscosity, gravity and evaporation. The model reveals the importance of the eyelid velocity, motion of the surface lipid layer and the storage of tear film between blinks.
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