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Three-dimensional non-parametric method for limbus detection.

Ahmed Abass1, Bernardo T Lopes1,2, Ashkan Eliasy1

  • 1School of Engineering, University of Liverpool, Liverpool, United Kingdom.

Plos One
|November 27, 2018
PubMed
Summary
This summary is machine-generated.

The white-to-white distance is greater nasally-temporally than superiorly-inferiorly in the human eye. The limbus diameter shows no significant directional variation, with a 3D tilt observed towards the nasal-inferior side.

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Area of Science:

  • Ophthalmology and Optometry
  • Biomedical Engineering
  • Medical Imaging

Background:

  • Accurate measurement of ocular dimensions is crucial for various ophthalmic applications, including contact lens fitting and surgical planning.
  • Existing methods for measuring the white-to-white distance and limbus dimensions may lack precision or comprehensive 3D characterization.

Purpose of the Study:

  • To introduce a novel non-parametric algorithm for precise 3D limbus detection.
  • To present a new dynamic method for measuring the full 360° visible iris boundary (white-to-white distance) along the eye's horizontal axis.

Main Methods:

  • Utilized data from 88 participants (ages 23-65), including digital eye images (1024×1280 pixels) captured by an Eye Surface Profiler.
  • Developed custom MATLAB codes for image processing, implementing a dynamic light intensity frequency-based white-to-white detection and a novel 3D limbus detection algorithm.

Main Results:

  • Found significant differences (p<0.001) in white-to-white distances: nasal-temporal (11.74±0.42 mm right, 11.82±0.47 mm left) versus superior-inferior (11.52±0.45 mm right, 11.55±0.46 mm left).
  • Limbus diameters showed no significant directional variation (nasal-temporal vs. superior-inferior) or between eyes (p>0.16).
  • 3D analysis revealed a significant tilt in the limbus contour towards the nasal-temporal side, with specific mean tilts around the X and Y axes for both eyes.

Conclusions:

  • The white-to-white distance is significantly larger in the nasal-temporal direction compared to the superior-inferior direction in human eyes.
  • Human limbus diameter does not vary significantly across these directions, but its 3D contour is non-planar, tending to be higher on the nasal-inferior aspect.