In vitro analysis of the interaction of tear film inflammatory markers with contemporary contact lens materials

  • Parisa Mirzapour
    Correspondence
    Corresponding author at: Centre for Ocular Research & Education (CORE), School of Optometry & Vision Science, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada.
    Affiliations
    Centre for Ocular Research & Education (CORE), School of Optometry & Vision Science, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada
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  • David J. McCanna
    Affiliations
    Centre for Ocular Research & Education (CORE), School of Optometry & Vision Science, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada
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  • Lyndon Jones
    Affiliations
    Centre for Ocular Research & Education (CORE), School of Optometry & Vision Science, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada

    Centre for Eye & Vision Research (CEVR), 17W Hong Kong Science Park, Hong Kong
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Published:March 23, 2021DOI:https://doi.org/10.1016/j.clae.2021.02.016

      Highlights

      • Contemporary contact lenses were soaked in solutions containing IL-1β, IL-6, IL-8 and TNF-α.
      • Samples of the soaking solutions were analyzed using the Meso Scale Discovery system.
      • The contact lens materials tested did not exhibit uptake of IL-6.
      • The contact lens materials tested did not exhibit more than 10 ± 3 % to 25 ± 12 % uptake of IL-1β, IL-8 or TNF-α.
      • Increases in corneal infiltrative events associated with reusable SiHy use are likely not due to uptake of these cytokines.

      Abstract

      Purpose

      Several clinical studies have suggested that reusable silicone hydrogel contact lens materials exhibit a two-times increased rate of corneal infiltrative events compared to reusable hydrogels. One potential factor contributing to this complication relates to the differential uptake of tear film-based pro-inflammatory cytokines. The purpose of this study was to use an in vitro assay to investigate whether four pro-inflammatory cytokines differed in their uptake onto six contemporary contact lens materials.

      Methods

      Conventional hydrogel (etafilcon A, omafilcon A) and silicone hydrogel (balafilcon A, comfilcon A, senofilcon A, somofilcon A) contact lens materials were soaked in solutions containing pro-inflammatory cytokines IL-1β, IL-6, IL-8 and TNF-α. Samples of the soaking solutions were collected over various time points and analyzed using the Meso Scale Discovery system, which served as a measurement of cytokine uptake onto the contact lens materials.

      Results

      Both conventional hydrogels (etafilcon A, omafilcon A) and two of the four silicone hydrogels tested (balafilcon A, comfilcon A), exhibited some uptake of IL-1β, IL-8 or TNF-α (p < 0.05). Senofilcon A and somofilcon A did not exhibit uptake of any of these cytokines (p > 0.05). There was no uptake of IL-6 onto any of the contact lens materials investigated (p > 0.05).

      Conclusion

      The contact lens materials tested did not exhibit any uptake of IL-6 and furthermore, did not exhibit more than 10 ± 3 % to 25 ± 12 % uptake of IL-1β, IL-8 or TNF-α. Numerous factors could contribute to the reported increase in corneal infiltrative events with reusable silicone hydrogel materials, however, based on these results, it appears that uptake of these four cytokines are unlikely to contribute to this finding.

      Keywords

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