The viscosity of human tears

@article{Tiffany1991TheVO,
  title={The viscosity of human tears},
  author={John M. Tiffany},
  journal={International Ophthalmology},
  year={1991},
  volume={15},
  pages={371-376}
}
Blinking involves high rates of shear within the tear film, requiring a low tear viscosity to avoid damage to epithelial surfaces. Conversely, in the open eye, a higher viscosity is desirable to resist drainage and film break-up. Samples of human tears were collected with moderate stimulation from 5 adult males, 3 with normal and 2 with marginally-dry eyes. The apparent viscosity at 22° C was found using a Couette-type rheometer over the range of shear rate 2–160 sec-1. Marked shear-thinning… CONTINUE READING

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