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Considerations in Contact Lens Use Under Adverse Conditions Proceedings of a Symposium (1991) / Chapter Skim
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Lens Performance Considerations
Pages 128-134

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From page 128...
... However, one must be aware that there is often bias on the part of contact lens wearers to want to continue wearing them and they thus downplay any problems. RIGID LENSES Advantages of Rigid Lenses The oxygen transmissibility of newer rigid lens materials is greater than most hydrogel designs.
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From page 129...
... Lens surface drying and front surface coatings causing blurred vision will be a problem with some individuals, especially under low-humidity conditions. Only with the development of materials with better surface properties will this problem be totally eliminated.
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From page 130...
... Deposits and spoilage of hydrogel lenses have been a major problem with daily and extended wear. Depositing is accelerated by surface drying, increased lens water content, ionic lens materials, and improper cleaning.
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From page 131...
... It is used extensively in pediatric aphakic patients, where extended wear is required and the lenses must be thick due to the lens powers. There have been problems with soft silicone lenses due to discomfort, poor surface Nettability, and lens adherence.
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From page 132...
... Marano 1987 Low atmospheric pressure effects on wearing soft contact lenses. Aviation, Space and Environmental Medicine 49(1)
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From page 133...
... Holden 1988 Overnight corneal edema with hydrogel, rigid gas-permeable and silicone elastomer contact lenses. International Contact Lens Clinic 15~5~:149153.
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From page 134...
... International Contact Lens Clinic 10~6~:349-352. Van Norren, D
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Key Terms

  • contact lens
  • hydrogel lenses
  • rigid lenses
  • international contact
  • lens clinic

  • extended wear
  • foreign bodies
  • adverse conditions
  • surface drying
  • bodies getting

  • thicker lenses
  • soft silicone
  • soft contact
  • lens wear
  • silicone lenses

  • hydrophilic contact
  • consistent vision
  • silicone elastomer
  • lenses due
  • prism ballast

  • ballast lenses
  • oxygen transmissibility
  • lens loss
  • corneal edema
  • lens materials

  • thinner lenses
  • van norren
  • lens forum
  • surface coatings
  • usually extended


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