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Rigid gas permeable contact lenses in hyperbaric environments.

J F Socks1, J F Molinari, J L Rowey

  • 1Alcon Laboratories, Fort Worth, Texas.

American Journal of Optometry and Physiological Optics
|December 1, 1988
PubMed
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Hard gas permeable contact lenses can form bubbles under the lens during decompression in hyperbaric environments. These bubbles likely originate from the tear layer, not nitrogen off-gassing from eye tissues.

Area of Science:

  • Ophthalmology
  • Diving Medicine
  • Biomaterials Science

Background:

  • Hard gas permeable contact lenses are frequently worn by individuals in various environments.
  • Hyperbaric environments involve increased ambient pressure, posing unique physiological challenges.

Purpose of the Study:

  • To investigate the occurrence and potential origin of bubbles forming under hard gas permeable contact lenses during simulated decompression in a hyperbaric environment.

Main Methods:

  • Twenty-four exposures using three different hard gas permeable contact lens materials were conducted in a hyperbaric chamber.
  • Simulated dry air dive profiles included depths of 45.72m, 22.86m, and 11.43m with varying durations.
  • Visual observation for bubble formation under the lenses was performed at different simulated depths.

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Main Results:

  • Bubbles were observed forming under all tested hard gas permeable contact lens materials.
  • Bubble formation was detected at simulated depths as shallow as 1.98m, even after less stressful exposures.
  • The timing and shallow depth of bubble appearance suggest they do not originate from nitrogen off-gassing from eye tissues.

Conclusions:

  • The study indicates that bubble formation under hard gas permeable contact lenses is a common occurrence during hyperbaric decompression.
  • Evidence suggests these bubbles originate from the tear layer rather than nitrogen diffusion from ocular tissues.
  • Further research may be needed to understand the clinical implications of these bubbles for contact lens wearers in hyperbaric conditions.