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Corneal densitometry in keratoconus.

Bernardo Lopes1, Isaac Ramos, Renato Ambrósio

  • 1*Rio de Janeiro Corneal Tomography and Biomechanics Study Group, Rio de Janeiro, Brazil; †Instituto de Olhos Renato Ambrósio, Rio de Janeiro, Brazil; and ‡Department of Ophthalmology, Federal University of São Paulo, São Paulo, Brazil.

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|October 7, 2014
PubMed
Summary
This summary is machine-generated.

Corneal densitometry measured by Scheimpflug tomography shows increased light backscatter in keratoconic (KC) corneas compared to normal corneas, particularly in the central anterior region. Advanced stages of keratoconus exhibit higher densitometry levels.

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Area of Science:

  • Ophthalmology
  • Biomedical Optics
  • Corneal Imaging

Background:

  • Keratoconus is a progressive thinning disorder of the cornea.
  • Accurate assessment of corneal changes is crucial for diagnosis and management.
  • Corneal densitometry offers a quantitative measure of light scattering within the cornea.

Purpose of the Study:

  • To compare corneal densitometry between normal and keratoconic eyes using Scheimpflug tomography.
  • To evaluate differences in densitometry values across various stages of keratoconus.
  • To investigate the relationship between corneal densitometry and keratoconus progression.

Main Methods:

  • Corneal densitometry was measured using Scheimpflug tomography (Pentacam) in 172 normal and 98 keratoconic eyes.
  • Measurements were taken over a 12-mm diameter, divided into annular zones and depths.
  • Keratoconus staging was performed using the topographic keratoconus classification system.

Main Results:

  • Significant differences in corneal densitometry were observed between normal and keratoconic eyes in central (0-2mm) and mid-peripheral (2-6mm) annuli, as well as total corneal thickness.
  • Higher densitometry values, indicating increased light backscatter, were found in the anterior, central, and posterior corneal layers of keratoconic eyes.
  • Corneal densitometry varied significantly with keratoconus stage, with more advanced cases showing higher backscatter, especially in the anterior layer.

Conclusions:

  • Scheimpflug tomography-based corneal densitometry reveals increased light scattering in the central anterior cornea of keratoconic eyes.
  • Corneal densitometry measurements correlate with the severity of keratoconus, increasing in more advanced stages.
  • This technique provides valuable insights into the structural changes and progression of keratoconus.