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Related Experiment Video

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Thinner retinal layers are associated with changes in the visual pathway: A population-based study.

Unal Mutlu1,2, Mohammad K Ikram1,3, Gennady V Roshchupkin4,5

  • 1Department of Epidemiology, Erasmus University Medical Center, Rotterdam, the Netherlands.

Human Brain Mapping
|June 24, 2018
PubMed
Summary
This summary is machine-generated.

Thinner retinal nerve fiber layer (RNFL) and ganglion cell layer (GCL) are linked to specific visual pathway brain changes, not global atrophy. Optical coherence tomography (OCT) findings correlate with gray and white matter alterations.

Keywords:
brainmagnetic resonance imagingpopulation-based studyretinavisual pathwaysvoxel-based morphometry

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Area of Science:

  • Neuroscience
  • Ophthalmology
  • Medical Imaging

Background:

  • Retinal nerve fiber layer (RNFL) and ganglion cell layer (GCL) thinning on optical coherence tomography (OCT) may indicate global brain atrophy.
  • The specific brain regions associated with these retinal layer changes are not well understood.

Purpose of the Study:

  • To investigate the association between peripapillary RNFL and perimacular GCL thickness and specific brain regions using voxel-based analysis.
  • To determine if retinal thinning relates to gray matter density and white matter microstructure in specific brain areas.

Main Methods:

  • Utilized data from 2,235 participants (Rotterdam Study) with retinal OCT and brain MRI scans, including diffusion tensor (DT) imaging.
  • Measured RNFL and GCL thicknesses using automated segmentation.
  • Applied voxel-based morphometry to DT-MRI data and performed linear regression to analyze associations.

Main Results:

  • Thinner RNFL and GCL were associated with reduced gray matter density in the visual cortex.
  • Retinal thinning correlated with altered white matter microstructure (lower fractional anisotropy, higher mean diffusivity) in optic radiation tracts.
  • Thinner GCL was also linked to lower gray matter density in the thalamus.

Conclusions:

  • RNFL and GCL thinning on OCT are specifically associated with gray and white matter changes within the visual pathway.
  • These findings suggest retinal thinning may reflect localized visual pathway degeneration rather than generalized brain atrophy.
  • The results provide a basis for understanding visual symptoms in conditions like Alzheimer's disease and posterior cortical atrophy.