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Related Experiment Videos

Extended wear in perspective

N A Brennan1, M L Coles

  • 1Brennan Consultants Pty. Ltd., Medical Centre, Melbourne, Australia.

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|August 1, 1997
PubMed
Summary

Extended wear of contact lenses offers convenience but poses safety risks, primarily infectious keratitis. Improving oxygen permeability and lens materials may enable safer extended wear options for refractive error correction.

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Area of Science:

  • Ophthalmology
  • Materials Science

Background:

  • Convenience and safety are key factors in choosing refractive error correction methods.
  • Extended wear of contact lenses offers greater convenience than daily wear, but safety concerns persist.
  • This study examines obstacles to extended wear and proposes solutions.

Purpose of the Study:

  • Investigate challenges hindering the adoption of extended contact lens wear.
  • Identify strategies to overcome safety and risk issues associated with extended wear.
  • Analyze factors contributing to adverse reactions and propose preventative measures.

Main Methods:

  • Review the history of extended soft contact lens wear for cosmetic purposes.
  • Analyze incidence and relative risk studies of major complications.
  • Examine risk factors and proposed scientific mechanisms for adverse reactions.

Main Results:

  • Infectious keratitis is a significant concern, though potentially disproportionate to actual risk compared to non-wear.
  • Corneal hypoxia during extended wear is linked to infectious keratitis; higher oxygen levels may reduce risks.
  • Stagnation of the tear film, lens mechanics, and lens movement are unresolved issues contributing to adverse responses.

Conclusions:

  • Enhancing oxygen permeability and mechanical properties of soft contact lenses are crucial for safe extended wear.
  • New materials under development show promise for achieving desired properties.
  • These advancements may lead to the long-awaited safe extended wear of contact lenses.

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