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Related Experiment Videos

Choroidal thickness in primary glaucoma.

G Cristini1, G Cennamo, P Daponte

  • 1Eye Clinic, University of Bologna, Italy.

Ophthalmologica. Journal International D'Ophtalmologie. International Journal of Ophthalmology. Zeitschrift Fur Augenheilkunde
|January 1, 1991
PubMed
Summary
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Radiofrequency signals can measure individual ocular layer thickness, unlike A and B scan echography. Glaucoma patients showed a 20% thicker choroid layer compared to normal subjects.

Area of Science:

  • Ophthalmology
  • Biomedical Engineering
  • Medical Imaging

Background:

  • Standard A and B scan echography cannot differentiate the thickness of the retina, choroid, and sclera.
  • Radiofrequency (RF) signal analysis offers a potential method for precise ocular layer thickness measurement.

Purpose of the Study:

  • To investigate the feasibility of using radiofrequency signals to measure individual ocular layer thickness.
  • To compare the thickness of ocular layers in normal subjects versus patients with chronic glaucoma and ocular hypertension.

Main Methods:

  • Examination of 48 eyes from normal subjects.
  • Examination of 21 eyes from patients with chronic glaucoma (ocular hypertension 30-45 mm Hg).
  • Utilized radiofrequency signal analysis to measure retinal, choroidal, and scleral thickness separately.

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Main Results:

  • Retinal and scleral thicknesses were comparable between normal and glaucomatous eyes.
  • The choroid layer was found to be 20% thicker in eyes with chronic glaucoma compared to normal eyes.

Conclusions:

  • Radiofrequency signal analysis enables separate measurement of ocular layer thicknesses.
  • Choroidal thickening is a characteristic finding in chronic glaucoma with ocular hypertension.