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Related Experiment Videos

Contact lens back surface specification derived from the EyeSys videokeratoscope.

W T Evardson1, W A Douthwaite

  • 1Department of Optometry, University of Bradford, West Yorkshire, UK. w.t.evardson@bradford.ac.uk

Contact Lens & Anterior Eye : the Journal of the British Contact Lens Association
|November 24, 2005
PubMed
Summary

EyeSys Corneal Analysis System 2000 software may create rigid corneal lenses with excessive tear layer and edge clearance, particularly on flatter corneas. Textbook designs offered a different fitting profile compared to EyeSys alignment fits.

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Area of Science:

  • Ophthalmic optics
  • Corneal topography
  • Contact lens design

Background:

  • Rigid corneal lenses are crucial for vision correction.
  • Accurate lens design minimizes ocular complications.
  • Software-based design tools are increasingly used in optometry.

Purpose of the Study:

  • To compare rigid corneal lens designs generated by EyeSys software versus a textbook program.
  • To evaluate tear layer thickness and axial edge clearance for both design methods.
  • To assess fitting characteristics, especially for flatter corneas.

Main Methods:

  • Designed rigid corneal lenses for 36 subjects using EyeSys software (version 2.00W) and a textbook program.
  • Investigated both alignment and apical clearance fitting designs.

Related Experiment Videos

  • Analyzed tear layer thickness and axial edge clearance outcomes.

    • Main Results:

    • EyeSys lenses resulted in excessive tear layer thickness and axial edge clearance in some subjects, notably with flatter corneas.
    • Alignment fits from EyeSys were steeper in the back optic zone and flatter peripherally compared to textbook designs.

    Conclusions:

    • The EyeSys software may produce lens designs with potentially excessive clearances, requiring careful consideration, especially for flatter corneal shapes.
    • Differences in design parameters between software and textbook methods highlight the need for thorough evaluation of contact lens fitting characteristics.