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Development of an In Vitro Ocular Platform to Test Contact Lenses
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A novel method to measure oxygen permeability and transmissibility of contact lenses
1Bioproducts Laboratory, Central Leather Research Institute, Adyar, Chennai, India.
Purpose:
The present paper describes an accurate and cost-effective method requiring simple equipment to measure the oxygen permeability and transmissibility of contact lenses.
Method:
The method involves accurate measurement of oxygen across the material by allowing the gas (oxygen) to pass through the lens material in a specially fabricated lens mould. The expelled gas is collected by dissolution in ethanol and the oxygen is measured by titration of the solvent.
Result:
This method is suitable for the measurement of oxygen permeability and transmissibility of contact lenses of varying thickness and different radii of curvature. It can measure Dk and Dk/t of collagen bandage lenses in both wet and dry conditions.
Conclusion:
The oxygen permeability and transmissibility values obtained by this method were compared with the oxygen permeability standard values of commercially available contact lenses and the results are summarised.
