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Poorly fitting soft lenses affect ocular integrity.

G Young1, S Coleman

  • 1Visioncare Research Ltd, Franham, Surrey, UK.

The CLAO Journal : Official Publication of the Contact Lens Association of Ophthalmologists, Inc
|May 16, 2001
PubMed
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Suboptimal soft contact lens fits, both tight and loose, significantly increase the risk of corneal staining and other ocular irritations. Proper lens fitting is crucial for maintaining ocular health and preventing adverse effects.

Area of Science:

  • Ophthalmology
  • Optometry
  • Contact Lens Science

Background:

  • Soft contact lenses are widely used for vision correction.
  • The fit of a contact lens can influence ocular comfort and health.
  • Understanding the physiological impact of different lens fits is essential for eye care practitioners.

Purpose of the Study:

  • To investigate whether borderline fitting soft contact lenses cause greater ocular physiological changes compared to well-fitting lenses.
  • To quantify the effects of tight and loose soft lens fits on ocular tissues.

Main Methods:

  • Retrospective analysis of data from seven clinical studies involving soft contact lenses.
  • Comparison of ocular findings in 63 eyes with borderline fits (tight or loose) versus optimally fitting control lenses.

Related Experiment Videos

  • Defined tight fits (> or =65% push-up), loose fits (< or =35% push-up), and optimal fits (45-50% push-up, <0.7 mm decentration).
  • Evaluated slit lamp findings at one-month follow-up.

    • Main Results:

    • Significantly higher corneal staining in tight lens wearers (68%) compared to controls (42%).
    • Increased corneal staining (69%) and hyperemia (bulbar and limbal) in loose lens wearers.
    • Corneal staining incidence increased with both increasing tightness and looseness of lens fit.

    Conclusions:

    • The quality of soft contact lens fit directly impacts ocular physiology, particularly corneal and conjunctival staining.
    • Practitioners should adopt a lower tolerance for sub-optimal soft lens fittings to minimize patient complications.
    • Emphasizes the importance of precise contact lens fitting for ocular health.