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Observation and Analysis of Blinking Surface-enhanced Raman Scattering
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Spontaneous Blinking from a Tribological Viewpoint.

Heiko Pult1, Samuele G P Tosatti2, Nicholas D Spencer3

  • 1Dr. Heiko Pult, Optometry & Vision Research, Weinheim, Germany; Cardiff University, School of Optometry & Vision Sciences, Cardiff, UK; Ophthalmic Research Group, Life and Health Sciences, Aston University, Birmingham, UK.

The Ocular Surface
|June 6, 2015
PubMed
Summary

Mechanical forces during blinking impact dry eye. Low friction reduces discomfort, while dry eye may impair lubrication, causing ocular surface wear.

Keywords:
blinkingcoefficient of frictioncontact lenslid wipertear filmtribologyviscosity

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Area of Science:

  • Ophthalmology
  • Tribology
  • Biomaterials

Background:

  • Mechanical forces between ocular surfaces and contact lenses are linked to dry eye symptoms and signs like lid-wiper epitheliopathy (LWE) and lid-parallel conjunctival folds (LIPCOF).
  • Reducing friction at the ocular surface may enhance contact lens comfort by minimizing mechanical interactions.

Purpose of the Study:

  • To review the mechanical forces during spontaneous blinks from a tribological viewpoint.
  • To analyze the role of friction and lubrication in ocular surface health and dry eye conditions.

Main Methods:

  • Discussion of tribological principles applied to ocular surface interactions during blinking.
  • Analysis of sliding velocities, fluid film lubrication, and shear rates in healthy and dry eye states.

Main Results:

  • Ocular surface friction resembles hydrophilic polymer brushes at low sliding velocities.
  • A fluid film prevents wear at higher velocities in healthy eyes.
  • Dry eye may compromise fluid film lubrication, increasing shear rates and causing surface deformation and wear, potentially linked to tear film viscosity.

Conclusions:

  • Understanding ocular tribology is crucial for managing dry eye and improving contact lens wear.
  • Tear film viscosity and lubrication dynamics are key factors in preventing ocular surface damage during blinking.