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Corneal oxygen deficiency.

Desmond Fonn1, Deborah Sweeney, Brien A Holden

  • 1Centre for Contact Lens Research, School of Optometry, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada. dfonn@sciborg.uwaterloo.ca

Eye & Contact Lens
|January 25, 2005
PubMed
Summary
This summary is machine-generated.

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High oxygen permeability (Dk) silicone hydrogel contact lenses offer significant ocular health benefits compared to low Dk hydrogel lenses. These advanced lenses improve the eye's physiological response, especially for overnight wear.

Area of Science:

  • Ophthalmology
  • Optometry
  • Biomaterials Science

Background:

  • Soft contact lenses are widely used for vision correction.
  • Oxygen permeability (Dk) is a critical parameter influencing ocular health during contact lens wear.
  • Traditional low Dk hydrogel lenses have limitations regarding oxygen transmission.

Purpose of the Study:

  • To compare the ocular effects of low Dk hydrogel and high Dk silicone hydrogel contact lenses.
  • To evaluate the impact of different contact lens materials on corneal health and physiological responses.

Main Methods:

  • A comprehensive literature review was conducted.
  • Studies examining the effects of low and high Dk soft lenses on corneal swelling, vascularization, refractive error, and corneal epithelium were analyzed.

Related Experiment Videos

Main Results:

  • High Dk silicone hydrogel contact lenses have been available for research and clinical use for approximately 10 and 5 years, respectively.
  • Numerous studies demonstrate significant improvements in the eye's physiological response with high Dk silicone hydrogel lenses.
  • These benefits are particularly pronounced during overnight contact lens wear.

Conclusions:

  • Despite currently representing only about 2% of contact lens wearers, silicone hydrogel lenses show superior ocular effects compared to low Dk hydrogels.
  • The positive physiological impact of silicone hydrogel lenses suggests they will likely become the dominant contact lens material in the future.
  • This shift is driven by enhanced patient outcomes and reduced risk of contact lens-induced complications.