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Hydrogel contact lens ageing.

P B Morgan1, N Efron

  • 1Department of Optometry and Neuroscience, University of Manchester Institute of Science and Technology, United Kingdom.

The CLAO Journal : Official Publication of the Contact Lens Association of Ophthalmologists, Inc
|May 16, 2000
PubMed
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Hydrogel contact lens water content significantly decreases over a 28-day wearing period, demonstrating an aging effect. This dehydration impacts comfort and oxygen performance, varying by lens type.

Area of Science:

  • Ophthalmology
  • Biomaterials Science
  • Optometry

Background:

  • Soft contact lenses are widely used for vision correction.
  • Understanding lens material changes during wear is crucial for patient eye health.
  • Hydrogel lens dehydration over time can affect performance and comfort.

Purpose of the Study:

  • To investigate the 'aging' effect on hydrogel contact lens water content over a four-week wearing period.
  • To determine if lens water content decreases significantly with extended wear.
  • To assess differences in dehydration patterns among various soft contact lens brands.

Main Methods:

  • Six subjects wore four different hydrogel lens types (Acuvue, Frequency 38, Gentle Touch, Proclear) for 28 days.
  • Daily pre-insertion and post-removal lens water content was measured using a refractometer.

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  • Subjective comfort was recorded daily throughout the study period.

    • Main Results:

    • A significant decrease in pre-insertion lens water content was observed for all tested lenses over 28 days (P < 0.05).
    • Dehydration patterns varied between lens types, with Acuvue and Gentle Touch showing consistent daily dehydration, while Frequency 38 and Proclear showed decreasing dehydration.
    • Significant end-of-day comfort decrease was reported for three of the four lens types.

    Conclusions:

    • Hydrogel contact lens dehydration is a dynamic process that changes over the wearing period.
    • The rate and pattern of dehydration differ across various soft contact lens materials.
    • Lens dehydration impacts oxygen performance and clinical comfort, informing practitioner recommendations.