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Scleral topography analysed by optical coherence tomography.

Stefan Bandlitz1, Joachim Bäumer2, Uwe Conrad2

  • 1Höhere Fachschule für Augenoptik Köln (Cologne School of Optometry), Cologne, Germany; Ophthalmic Research Group, Life and Health Sciences, Aston University, Birmingham, UK.

Contact Lens & Anterior Eye : the Journal of the British Contact Lens Association
|May 13, 2017
PubMed
Summary

Scleral radii, measured using optical coherence tomography (OCT), are independent of corneal topography. This finding is crucial for improving the fitting of soft and scleral contact lenses.

Keywords:
Cornea radiusCorneal eccentricityCorneo-scleral topographyOptical coherence tomographyScleral radius

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Area of Science:

  • Ophthalmology
  • Optometry
  • Biomedical Engineering

Background:

  • Accurate corneo-scleral-profile (CSP) assessment is vital for effective soft and scleral contact lens fitting.
  • Optical coherence tomography (OCT) offers a non-invasive method for detailed ocular surface analysis.

Purpose of the Study:

  • To utilize OCT for analyzing the limbal scleral profile.
  • To investigate the relationship between central corneal radii, corneal eccentricity, and scleral radii.

Main Methods:

  • Scleral radii (SR) were measured in eight meridians using OCT in 30 subjects.
  • Central corneal radii (CR) and corneal eccentricity (CE) were assessed using the Oculus Keratograph 4.
  • Statistical analyses were performed to compare SR across meridians and correlate with corneal topography.

Main Results:

  • Significant differences in scleral radii were observed across various meridians (p<0.001).
  • Nasal scleral radii at 0° were significantly flatter than temporal scleral radii at 180° (p<0.001).
  • No significant correlation was found between central corneal radii or corneal eccentricity and scleral radii in any meridian (p>0.05).

Conclusions:

  • OCT enables precise measurement of scleral radii in multiple meridians.
  • Scleral radii measurements are independent of corneal topography.
  • These findings can enhance the precision of soft and scleral contact lens fitting.