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Related Experiment Videos

Rigid lens fitting made easier using a modified keratometer

A K Lam1

  • 1Optometry Section, Hong Kong Polytechnic.

Ophthalmic & Physiological Optics : the Journal of the British College of Ophthalmic Opticians (Optometrists)
|January 1, 1993
PubMed
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Modified keratometry accurately measures corneal topography, enabling a computer program to determine apical radius and p-value. This computerized method aids in rigid lens fitting, proving effective for diverse populations.

Area of Science:

  • Ophthalmology
  • Optometry
  • Biomedical Engineering

Background:

  • Corneal topography is crucial for accurate vision correction.
  • Traditional methods for measuring corneal shape have limitations in capturing peripheral data.
  • Rigid gas permeable lens fitting requires precise knowledge of corneal curvature.

Purpose of the Study:

  • To evaluate a modified keratometer's ability to measure central and peripheral corneal regions.
  • To assess a computer program's efficacy in determining corneal apical radius and p-value.
  • To validate a computerized rigid lens fitting method.

Main Methods:

  • Simple modification of a standard keratometer to capture peripheral corneal data.
  • Utilizing a computer program to analyze keratometer readings and calculate corneal parameters.

Related Experiment Videos

  • Comparing computerized lens parameter suggestions with conventional rigid lens fitting outcomes.

    • Main Results:

    • The modified keratometer successfully measured both central and peripheral corneal regions.
    • The computer program accurately determined the apical radius and p-value from the collected data.
    • Computerized lens parameter suggestions were comparable to those from conventional fitting methods.

    Conclusions:

    • A modified keratometer combined with a computer program offers a viable method for corneal analysis.
    • This computerized approach simplifies and potentially improves the accuracy of rigid lens fitting.
    • The method demonstrates applicability across different ethnic groups, including Chinese subjects.