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Related Concept Videos

Types of Fluids01:27

Types of Fluids

515
Fluids can be classified into Newtonian and non-Newtonian fluids based on their response to shear stress. Newtonian fluids have a linear relationship between shear stress and the shear strain rate, following Newton's law of viscosity. Their viscosity remains constant regardless of the shear rate, making their behavior predictable and easier to analyze. Common examples include water, air, oil, and gasoline.
In contrast, non-Newtonian fluids do not follow Newton's law of viscosity, and...
515

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Related Experiment Video

Updated: Sep 24, 2025

Effect of Artificial Tear Formulations on the Metabolic Activity of Human Corneal Epithelial Cells after Exposure to Desiccation
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Rheological Behavior Patterns in Artificial Tears.

Alejandro Blasco-Martinez, Antonio Mateo-Orobia, Javier Blasco-Alberto1

  • 1Fluid Mechanics Service, Department of Materials and Fluid Science and Technology, University of Zaragoza, Zaragoza, Spain.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|May 5, 2022
PubMed
Summary
This summary is machine-generated.

This study objectively analyzed artificial tears, revealing diverse rheological patterns like shear thinning and thickening. These findings may help optimize ocular surface lubricant treatments.

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Area of Science:

  • Ophthalmology
  • Materials Science
  • Rheology

Background:

  • Artificial tears are crucial for managing ocular surface conditions.
  • Understanding their physical properties, specifically rheology, is essential for efficacy.
  • Previous studies have not comprehensively characterized the rheological behavior of a wide range of artificial tears.

Purpose of the Study:

  • To objectively describe the rheological behavior of various artificial tears.
  • To identify and classify the different flow patterns exhibited by artificial tear formulations.

Main Methods:

  • An experimental analytical study involving seventy-eight artificial tears.
  • Viscous behavior was measured using a cone-plate rheometer.
  • Rheological patterns were determined by analyzing viscosity changes across a shear rate range (1-1000 s⁻¹) and calculating hysteresis.

Main Results:

  • Four distinct rheological patterns were identified: shear thinning, shear thickening, thixotropic, and Newtonian.
  • The viscosity of artificial tears was found to be dependent on the shear rate.
  • Simultaneous rheological patterns were observed depending on the specific shear rate applied.

Conclusions:

  • The rheological behavior of artificial tears is complex and shear-rate dependent.
  • Identified rheological patterns can inform the optimization of artificial tear formulations for specific ocular surface conditions.
  • Further in vivo studies are required to establish the clinical relevance of these rheological findings.