Tear Fluid Simulation
Tear Fluid Simulation - Related Videos
12:39
Computational Fluid Dynamics Simulations of Blood Flow in a Cerebral Aneurysm
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2023
Source: Joseph C. Muskat, Vitaliy L. Rayz, and Craig J. Goergen, Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana The objective of this video is to describe recent advancements of computational fluid dynamic (CFD) simulations based on patient- or animal-specific vasculature. Here, subject-based vessel segmentations were created, and, using a combination of open-source and commercial tools, a high-resolution numerical solution was determined within a flow model.
08:16
Phenol Red Thread-based Sampling Procedure for Untargeted Tear Fluid Lipidomics in Biomarker Discovery
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2025
This protocol describes a unique clinical protocol for collecting human tear fluid samples using phenol red threads and liquid chromatography-tandem mass spectrometry (LC-MS/MS)-based workflow to discover the tear lipidomic profile. The simple methyl tert-butyl ether (MTBE)/methanol biphasic separation method enables rapid tear lipid extraction with high recovery for tear biomarker discovery.
04:38
A Novel Technique of Rescuing Capsulorhexis Radial Tear-out using a Cystotome
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Cited by 4 •
2011
Capsulorhexis is an important step in phacoemulsification surgery. A surgeon creates a continous curvilinear tear on the anterior lens capsule by controlling the tearing vector forces. A peripherally extended tear is a serious complication. This video demonstrates a novel technique of rescuing capsular radial tear out using a cystotome.
07:45
Tear-Derived Exosomal miR-15a as New Diagnostic Tool for Diabetic Retinopathy
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Cited by 1 •
2025
This article describes a protocol for the collection and detection of miR-15a from tears as a new diagnostic tool for diabetic retinopathy.
05:57
Sex Hormone Detection In Human Tear Film Using Enzyme-Linked Immunosorbent Assays
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2026
This protocol describes an optimized enzyme-linked immunosorbent assay (ELISA) method to detect and quantify 17β-estradiol and testosterone in human tear fluid collected via microcapillary tubes. This approach enables minimally invasive measurement of tear hormone levels.
FAQs
Boundary conditions specify how the modeled tear film behaves at its interfaces and along the ocular surface. Together with fluid properties, they determine how eyelid motion, surface tension, evaporation, and corneal interactions are represented numerically. Changing these conditions can alter predicted film movement or breakup, so bioengineers use defined conditions to make simulations consistent and interpretable.
Eyelid-driven spreading redistributes tear fluid across the ocular surface, while surface tension influences how the film maintains continuity and responds to disturbances. Their combined effects help determine whether the modeled layer remains distributed or develops localized changes. Representing both mechanisms allows simulations to examine tear protection and lubrication under changing fluid conditions.
Evaporation changes the tear film over time and can contribute to thinning, redistribution, or eventual breakup in a simulation. When evaporation is modeled alongside fluid movement and corneal interactions, researchers can examine how the film loses stability rather than treating it as a static layer. This supports investigation of mechanisms associated with dry-eye disease.
A typical workflow begins by representing tear-fluid properties, the ocular surface, eyelid-driven spreading, surface tension, evaporation, and relevant corneal interactions. Researchers then assign defined boundary conditions and apply numerical methods to calculate changes over time. The resulting predictions can be examined for film movement, stability, and breakup under the selected modeled conditions.
Bioengineers can use the modeled tear-film response to evaluate engineering concepts without relying solely on direct ocular testing. The overview identifies contact lenses, ocular drug-delivery systems, and diagnostic devices as applications. Simulated changes in movement, evaporation, or breakup can help assess how a proposed design may interact with the tear-covered corneal surface.
These models can help researchers examine tear-film instability, including changes that lead to fluid breakup over the ocular surface. By linking fluid dynamics with ocular physiology, simulations provide a noninvasive way to investigate possible mechanisms associated with dry-eye disease. They also allow engineering solutions to be tested computationally before further evaluation.