Artificial Tears
Artificial Tears - Related Videos
03:01
alamarBlue Assay: A Sensitive Fluorometric Method to Screen the Cytotoxic Effects of Artificial Tear Formulations on Metabolic Activity of Human Corneal Epithelial Cells
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2025
This video describes an in vitro fluorometric assay to assess the effects of artificial tear formulations on the cellular metabolic activity of corneal epithelial cells using resazurin-based Alamar blue solution. A non-toxic formulation maintains the cells in a healthy, metabolically active state, facilitating the reduction of resazurin into a highly fluorescent resorufin.
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.
06:29
Effect of Artificial Tear Formulations on the Metabolic Activity of Human Corneal Epithelial Cells after Exposure to Desiccation
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Cited by 1 •
2020
The purpose of this protocol is to evaluate if different artificial tear formulations can protect human corneal epithelial cells from desiccation using an in vitro model. After exposure to artificial tear formulations and desiccation, human corneal epithelial cells are assessed for metabolic activity.
03:14
Artificial Selection - Concepts
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2019
Natural Selection and Adaptive Evolution In natural settings, adaptive evolution takes place by natural selection, a process in which differences in traits lead to differences in survival and reproductive success between individuals. This happens because individuals with certain phenotypes have a higher probability of survival and/or produce more surviving offspring than individuals with other phenotypes. A classic example of this was demonstrated by Rosemary and Peter Grant studying the...
05:53
Artificial Selection - Student Protocol
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2019
Observing Artificial Selection in Plants ExpandTo begin the experiment, collect five two-week old grown plants from the generation one population that appear healthy. Note: Plants should appear green, not wilted, and not have damaged leaves. Experimental Hypothesis: The experimental hypothesis for this lab might be that the number of lead trichomes varies naturally, but the average number will increase over generations if only plants with the highest number of trichomes are interbred or...
FAQs
Water and electrolytes help provide the fluid phase of the preparation, while viscosity-enhancing polymers spread across the corneal surface and help the lubricant remain there. This increases lubrication and improves tear-film retention, addressing discomfort associated with a dry, irritated, or gritty eye. The combined formulation therefore supports more stable coverage of the ocular surface.
Lipid components can help reduce evaporation from the tear film, adding a mechanism that differs from simply increasing aqueous lubrication. This property may be relevant when rapid loss of the tear film contributes to ocular-surface discomfort. Comparing formulations with and without lipids helps connect product composition to tear-film retention and to the goal of longer-lasting relief.
Viscosity-enhancing polymers are important because they help preparations spread over the corneal surface and remain within the tear film. Dosing frequency provides a separate practical comparison: products may be considered according to how often lubrication is needed. Examining both properties helps relate formulation behavior to comfort, tear-film retention, and selection of longer-lasting therapies.
Preservative content is one of the formulation features considered when choosing an artificial-tear product. The available context does not assign a specific benefit or risk to a particular preservative profile, but it identifies this comparison as clinically relevant alongside formulation properties and dosing frequency. These factors support more informed use for people seeking relief from dry-eye symptoms.
Medical use is relevant when dry-eye symptoms accompany environmental exposure, reduced tear production, aging, or certain treatments. In these settings, artificial tears can improve comfort while supplementing lubrication at the ocular surface. Their role is supportive: the preparations help address irritation and grittiness and may contribute to a healthier ocular surface while the associated dry-eye context is considered.
Expected outcomes described for artificial tears include improved comfort and support for a healthier ocular surface. Their effects can be considered in relation to tear-film retention, since formulations that spread and remain over the cornea may provide more sustained lubrication. These observations also inform research into longer-lasting therapies, where formulation properties are compared with practical dosing needs.