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Testing Oxygen Permeability in Contact Lenses

Testing Oxygen Permeability in Contact Lenses

Testing Oxygen Permeability in Contact Lenses

Product catalog summary
Introduction to Oxygen Permeability in Contact Lenses
Oxygen permeability is crucial for comfortable and healthy contact lens wear, as it ensures that sufficient oxygen reaches the cornea. Insufficient oxygen can lead to discomfort, dryness, and serious eye issues. Therefore, testing the oxygen permeability of contact lenses is essential to ensure adequate oxygen supply to the eye.
Measurement Methods
Oxygen permeability is measured using various methods, with the results expressed as Dk/t. Here, D represents diffusivity, k indicates solubility, and t refers to the lens thickness. A higher Dk/t value indicates better oxygen flow to the cornea, reducing the risk of hypoxia. ISO 18369 provides a framework for terms and procedures related to contact lenses, including oxygen permeability, while ISO 9913 focuses on the coulometric method for measuring this property.
Labthink C230H Oxygen Transmission Rate Test System
The Labthink C230H system uses the coulometric sensor method to measure the oxygen transmission rate of materials with high accuracy and efficiency. This testing is vital for manufacturers to develop lens materials that prioritize eye health and for wearers to select lenses that ensure comfort and reduce complications.
Industry Collaboration and Future Directions
As the demand for functional materials increases, testing methods are evolving for more comprehensive evaluations. Labthink encourages collaboration with companies in the packaging and materials industries for quality control. More information can be found on their website.
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Catalog excerpts

Testing Oxygen Permeability in Contact Lenses-1

Labthink Instruments Co., Ltd. [email protected] +86-531-85068566 Testing Oxygen Permeability in Contact Lenses For comfortable and healthy contact lens wear, oxygen must reach the cornea. Insufficient oxygen can cause discomfort, dryness, and potentially serious eye problems. This is why oxygen permeability testing is so important. It measures how much oxygen can pass through a contact lens material, ensuring adequate oxygen supply to the eye. Various methods exist to measure oxygen permeability, each designed to accurately quantify a lens's ability to "breathe." This measurement is expressed as Dk/t, where D (Diffusivity) represents the rate at which oxygen moves through the material, and k (Solubility) indicates how much oxygen can dissolve within the material, t refers to the thickness of the lens. A higher Dk/t value signifies greater oxygen flow to the cornea, minimizing the risk of hypoxia (oxygen deficiency). ISO 18369 provides a general framework and defines terms related to contact lenses, including oxygen permeability. It specifically outlines the procedures for both polarographic and coulometric methods. ISO 9913 focuses specifically on the coulometric method for measuring oxygen permeability. It provides detailed instructions on the equipment, calibration, and testing procedures. 1

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Testing Oxygen Permeability in Contact Lenses-2

Labthink Instruments Co., Ltd. [email protected] +86-531-85068566 Labthink C230H Oxygen Transmission Rate Test System is designed and manufactured based on the coulometric sensor method. This instrument can be used to measure the oxygen transmission rate of materials with high and medium barrier properties with high accuracy and high efficiency. This testing is crucial for both manufacturers and wearers. It allows manufacturers to develop and refine lens materials that prioritize eye health. For wearers, it ensures they choose lenses that provide sufficient oxygen, promoting comfort and reducing...

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All Labthink Instruments Co., Ltd. catalogs and technical brochures

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Archived catalogs

  1. C611M

    2  Pages

  2. C306H

    3  Pages

  3. C230H

    4  Pages

  4. Leak Tester

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