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3-D corneal modeling system.

R J Mammone1, M Gersten, D J Gormley

  • 1Department of Electrical and Computer Engineering, Rutgers University, Piscataway, NJ 08854.

IEEE Transactions on Bio-Medical Engineering
|January 1, 1990
PubMed
Summary
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New refractive surgery requires instruments to monitor corneal reshaping. This study presents a novel instrument for detailed corneal topography, aiding surgeons in assessing refractive correction outcomes.

Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Optical Metrology

Background:

  • Refractive surgical procedures reshape the cornea to correct astigmatism and nearsightedness.
  • Current monitoring methods are insufficient for assessing the outcomes of these widespread corneal surgeries.
  • A need exists for precise instruments to measure corneal surface topography before and after refractive surgery.

Purpose of the Study:

  • To present a novel instrument for generating detailed topographical models of the human cornea.
  • To provide ophthalmologists and optometrists with essential optical properties of the cornea.
  • To address the need for monitoring refractive surgery outcomes.

Main Methods:

  • Utilizes a novel structured light source to create a topographical model of the cornea.

Related Experiment Videos

  • Models the cornea as a convex mirror, capturing a virtual image of the light source.
  • Employs triangulation between the acquired corneal image and a reference sphere for depth mapping.
  • Implements an iterative method to accurately calculate corneal radius of curvature despite magnification variations.
  • Digitizes the virtual image to obtain instantaneous corneal curvature in diopters.

    • Main Results:

    • The instrument provides a detailed topographical map of the cornea.
    • An iterative method successfully accounts for magnification variations during depth reconstruction.
    • Instantaneous corneal curvature is accurately determined and displayed in diopters.
    • The system offers essential optical properties for clinical assessment.

    Conclusions:

    • The presented instrument effectively generates detailed corneal topographical models.
    • The iterative method enables accurate curvature measurement, crucial for refractive correction assessment.
    • This technology addresses a critical need for monitoring refractive surgery, improving patient care.