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Pitfalls in aphakic contact lens fitting.

V K Dada1, M R Mehta, A K Jain

  • 1R.P. Centre for Ophthalmic Sciences, New Delhi.

Indian Journal of Ophthalmology
|January 1, 1990
PubMed
Summary
This summary is machine-generated.

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Unilateral aphakia significantly impacts corneal endothelium, causing cell density loss and shape changes. Careful contact lens fitting and monitoring are crucial to prevent complications in these vulnerable eyes.

Area of Science:

  • Ophthalmology
  • Corneal Science
  • Contact Lens Technology

Background:

  • Unilateral aphakia presents unique challenges for corneal health.
  • Endothelial cell function is critical for maintaining corneal clarity and hydration.
  • Contact lens wear in aphakic eyes requires careful consideration of corneal physiology.

Purpose of the Study:

  • To evaluate the endothelial cell count and morphology in unilateral aphakia.
  • To assess corneal thickness and toricity in aphakic eyes.
  • To identify potential complications and challenges in aphakic contact lens fitting.

Main Methods:

  • Examined 23 consecutive cases of unilateral aphakia.
  • Utilized the fellow eye as a control for comparison.
  • Assessed endothelial cell density, morphology, corneal thickness (pachymetry), and toricity.

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Main Results:

  • Significant reduction in central endothelial cell density observed.
  • Alterations in endothelial cell size and shape noted, indicating instability.
  • Aphakic corneas showed increased thickness, though not statistically significant.
  • No statistical correlation found between cell count and pachymetry.
  • Increased corneal toricity complicates contact lens fitting.

Conclusions:

  • Unilateral aphakia induces endothelial cell changes and corneal instability.
  • Prolonged contact lens wear (gas permeable and hydrogel) can harm the endothelium.
  • Careful patient selection and rigorous follow-up are essential for aphakic contact lens wearers.
  • Aphakic corneas are susceptible to decompensation from minor stimuli.
  • Ophthalmologists must be aware of pitfalls in fitting and managing contact lenses in aphakic eyes.