Tear Volume Measurement
Tear Volume Measurement - Related Videos
01:46
Quantification of Tear Volume in an Autoimmune Dry Eye Rat Model using the Phenol Red Thread
0 Views •
2025
This video demonstrates the phenol red thread test to determine tear volume in an autoimmune dry eye rat model. The pH-sensitive acidic phenol red thread changes color when it comes in contact with the alkaline tears. The shorter length of color change in the phenol red thread corresponds to reduced tear volume.
08:51
Understanding Concentration and Measuring Volumes
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2023
Solutions are utilized to some degree in almost all biological research applications. Therefore understanding how to measure and manipulate them is imperative to any experiment. In this video, concepts in preparing solutions are introduced. Solutions consist of a solute dissolved in solvent to yield a homogeneous mixture of molecular substances. Solutions are generally identified by their components and corresponding concentrations. Concentrated solutions are diluted through various...
09:15
Measuring Pressure Volume Loops in the Mouse
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Cited by 16 •
2016
This manuscript describes a detailed protocol for the collection of pressure-volume data from the mouse.
09:49
Measurement of the Pressure-volume Curve in Mouse Lungs
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Cited by 47 •
2015
Here we present a protocol to simply and reliably measure the lung pressure-volume curve in mice, showing that it is sufficiently sensitive to detect phenotypic parenchymal changes in two common lung pathologies, pulmonary fibrosis and emphysema. This metric provides a means to quantify the lung’s structural changes with developing pathology.
07:38
Cardiac Catheterization in Mice to Measure the Pressure Volume Relationship: Investigating the Bowditch Effect
0 Views •
Cited by 10 •
2015
This article describes the measurement of murine left ventricular function via pressure/volume analysis at different heart rates.
FAQs
Because tear production is assessed over a specified interval, the resulting wetting length or collected amount can be compared across samples more consistently. This timing standardization is important when evaluating lacrimal function, characterizing dry-eye conditions, or preparing tear fluid for downstream analysis of immune and antimicrobial factors.
The Schirmer approach reads tear-related wetting on a calibrated absorbent strip placed along the lower eyelid. Capillary collection instead obtains tear fluid directly for measurement and subsequent analysis. The methods therefore differ in how the sample is captured and represented: a moistened length on a strip versus a collected fluid amount.
Volume assessment helps standardize tear-fluid sampling for immunology and infection studies. That consistency supports examination of antimicrobial proteins, antibodies, inflammatory mediators, and other host-defense factors. It also provides information about lacrimal function and ocular-surface health, allowing molecular findings in tear fluid to be considered alongside the condition of tear production.
A calibrated absorbent strip is positioned along the lower eyelid, left in place for a defined period, and then assessed by measuring the length moistened by tears. The recorded length estimates aqueous tear production. Specifying both strip placement and timing is central to producing a standardized measurement suitable for evaluating lacrimal function.
Capillary collection is useful when a study needs tear fluid as a collected sample rather than a strip-based wetting readout. In immunology and infection research, this format can support standardized acquisition for examining antimicrobial proteins, antibodies, inflammatory mediators, and other host-defense factors. It complements strip-based assessment of lacrimal function.
In dry-eye research, tear volume assessment helps characterize lacrimal conditions and provides a consistent basis for comparing samples. In infection and immunology studies, it supports analysis of tear-fluid host defenses, including antimicrobial proteins, antibodies, and inflammatory mediators. The measurement supplies sampling context and does not by itself identify a particular immune factor.