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Related Experiment Videos

Optimising RGP lens fitting in normal eyes using 3D topographic data.

Eef van der Worp1, John de Brabander, Ben Lubberman

  • 1Department of Ophthalmology, Academic Hospital, Eye Research Institute Maastricht, Maastricht University, P.O. Box 5800, 6202 AZ Maastricht, The Netherlands. e.vanderworp@fg.hvu.nl

Contact Lens & Anterior Eye : the Journal of the British Contact Lens Association
|November 24, 2005
PubMed
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Optimizing rigid gas permeable (RGP) contact lens fit using 3D corneal topography significantly improves wearer comfort. Detailed corneal shape analysis, especially in mid-peripheral areas, is crucial for achieving optimal RGP lens fits and enhancing comfort.

Area of Science:

  • Ophthalmology
  • Optometry
  • Biomedical Engineering

Background:

  • Rigid gas permeable (RGP) contact lenses offer visual correction for various refractive errors.
  • Achieving an optimal fit is essential for lens comfort and successful wear.
  • Traditional fitting methods may not fully account for individual corneal topography.

Purpose of the Study:

  • To retrospectively analyze the impact of fitting characteristics on the comfort of wear for RGP contact lenses.
  • To evaluate the role of 3D topographic data in achieving an optimal lens fit in normal eyes.

Main Methods:

  • Retrospective analysis of 60 normal myopic eyes with limited astigmatism.
  • Lenses were initially ordered empirically using traditional fitting rules.
  • 3D corneal topography data was utilized to assess corneal shape, particularly in mid-peripheral regions.

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Main Results:

  • Initial empirical fitting was successful in only 40% of eyes.
  • Modifications including back optic zone radius adjustment (15%), switching to aspheric designs (28%), and non-rotational symmetric designs (17%) were needed for optimal fit.
  • Mid-peripheral corneal shape differences, identified by 3D topography, were the primary reason for parameter changes in 88% of cases.
  • Comfort significantly improved from 5.2 to 7.7 (P<0.05) after 3 months in eyes with optimal fits.
  • Switching to non-rotational symmetric designs improved comfort from 5.0 to 7.3 (P<0.05).

Conclusions:

  • 3D corneal topography measurement, especially of mid-peripheral regions, is vital for optimizing RGP lens fit.
  • Optimized RGP lens fits lead to a statistically significant increase in wearer comfort.