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Related Experiment Video

Updated: Jul 13, 2026

In vivo Structural Assessments of Ocular Disease in Rodent Models using Optical Coherence Tomography
07:44

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Published on: July 24, 2020

Macular Layer Thickness with Spectral-Domain and High-Resolution OCT.

Sung-Uk Baek1,2, Glen P Sharpe1, Lesya M Shuba1

  • 1Department of Ophthalmology and Visual Sciences, Dalhousie University, Halifax, Nova Scotia, Canada.

Ophthalmology Science
|July 12, 2026
PubMed
Summary
This summary is machine-generated.

High-resolution OCT (HR-OCT) and standard spectral-domain OCT (SD-OCT) show small but consistent differences in retinal layer thickness measurements. These variations may impact monitoring disease progression when switching between OCT devices.

Keywords:
High-resolution OCTOptical coherence tomography (OCT)Retinal thicknessSpectral-domain OCT

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Area of Science:

  • Ophthalmology
  • Medical Imaging
  • Retinal Imaging

Background:

  • High-resolution optical coherence tomography (HR-OCT) offers improved axial resolution over standard spectral-domain OCT (SD-OCT).
  • Accurate segmentation of retinal layers is crucial for monitoring diseases like glaucoma.
  • Understanding inter-device differences in OCT measurements is vital for longitudinal patient follow-up.

Purpose of the Study:

  • To compare retinal layer thickness measurements between HR-OCT and SD-OCT.
  • To assess the clinical significance of differences in segmentation for monitoring disease progression.
  • To evaluate the impact of switching OCT devices on patient monitoring.

Main Methods:

  • A prospective cross-sectional study involving glaucoma patients and healthy controls.
  • Macular scans were acquired using both SD-OCT and HR-OCT on the same eyes.
  • Automated segmentation analyzed the thickness of six retinal layers across 97 B-scans.

Main Results:

  • Mean differences in retinal layer thickness between SD-OCT and HR-OCT ranged from -2.65 to 2.02 μm.
  • Hyper-reflective layers appeared thicker with SD-OCT, while hyporeflective layers appeared thicker with HR-OCT.
  • Intra-device differences were within ±1 μm; image quality did not significantly predict inter-device differences.

Conclusions:

  • Small but consistent inter-device differences exist between SD-OCT and HR-OCT retinal layer thickness measurements.
  • These differences, particularly the alternating pattern, may be due to variations in axial resolution and border definition.
  • Switching between SD-OCT and HR-OCT for patient follow-up requires careful consideration of potential masking or masquerading of disease progression due to measurement discrepancies.