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Application of Optical Coherence Tomography to a Mouse Model of Retinopathy
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Local Macular Thickness Relationships between 2 OCT Devices.

Golnoush Mahmoudinezhad1, Vahid Mohammadzadeh1, Navid Amini2

  • 1Glaucoma Division, Stein Eye Institute, David Geffen School of Medicine, University of California at Los Angeles, Los Angeles, California.

Ophthalmology. Glaucoma
|September 1, 2020
PubMed
Summary
This summary is machine-generated.

Optical Coherence Tomography (OCT) devices show high correlation in ganglion cell-inner plexiform layer (GCIPL) thickness measurements, but are not interchangeable. Differences in GCIPL measurements depend on superpixel location and thickness.

Keywords:
Ganglion cell–inner plexiform layer thicknessMaculaOCTSuperpixels

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Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Glaucoma Research

Background:

  • Glaucoma is a leading cause of irreversible blindness.
  • Accurate measurement of retinal nerve fiber layer thickness is crucial for glaucoma diagnosis and monitoring.
  • Optical Coherence Tomography (OCT) is a key technology for in vivo imaging of the macula and optic nerve head.

Purpose of the Study:

  • To compare local ganglion cell-inner plexiform layer (GCIPL) thickness measurements between Cirrus and Spectralis OCT devices.
  • To identify factors influencing discrepancies in GCIPL thickness measurements between the two OCT devices.

Main Methods:

  • A cross-sectional study involving 69 glaucoma eyes from 63 patients with significant visual field defects.
  • Macular volume scans from Cirrus and Spectralis OCT devices were analyzed using aligned superpixels.
  • Spearman's correlations and Bland-Altman plots were used to assess agreement, and linear mixed models explored influencing factors.

Main Results:

  • High pooled Spearman's correlation (0.97) was observed between Cirrus and Spectralis GCIPL thickness measurements.
  • Bland-Altman analysis revealed systematic bias, with Spectralis measurements increasing relative to Cirrus with greater superpixel thickness.
  • Superpixel location and thickness significantly influenced measurement differences (P < 0.001).

Conclusions:

  • Local GCIPL thickness measurements from Cirrus and Spectralis OCT devices are highly correlated but not interchangeable.
  • Measurement discrepancies are influenced by the specific location and thickness of the analyzed retinal areas (superpixels).
  • Clinicians should be aware of potential differences when comparing GCIPL measurements between these OCT devices.