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Using Retinal Imaging to Study Dementia
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Retinal changes detected by diffuse reflectance spectroscopy in parkinsonian monkeys.

Jonathan Munro1, Elahe Parham1, Damon DePaoli1,2

  • 1Université Laval, CERVO Brain Research Center, Quebec City, Quebec, Canada.

Neurophotonics
|May 7, 2025
PubMed
Summary

Retinal spectroscopy may offer early Parkinson's disease (PD) diagnosis by detecting optical changes in the eye. This study used spectroscopy to identify potential biomarkers in monkeys with induced PD.

Keywords:
MPTPParkinson’s diseasebiomarkersneurodegenerative diseasenonhuman primatesretina

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Area of Science:

  • Ophthalmology
  • Neuroscience
  • Biomedical Optics

Background:

  • Parkinson's disease (PD) diagnosis currently occurs after significant neurodegeneration.
  • The retina may contain early diagnostic biomarkers for PD.
  • Retinal spectroscopy is a promising noninvasive technique for biomarker discovery.

Purpose of the Study:

  • To investigate retinal spectroscopic changes in a primate model of Parkinson's disease.
  • To identify potential retinal biomarkers for early PD diagnosis using spectroscopy.

Main Methods:

  • Employed the Zilia Ocular device for spectrometric scans of the optic nerve head (ONH) and retina in cynomolgus monkeys.
  • Administered 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) to create a PD model.
  • Analyzed diffuse reflectance spectra (DRS) and performed post-mortem retinal analyses.

Main Results:

  • Diffuse reflectance spectra (DRS) showed a reduced slope between 480-525 nm in both ONH and retina.
  • Post-mortem analysis revealed a thinner outer nuclear layer in MPTP-treated monkeys.
  • MPTP induced alterations in ocular optical properties and retinal structure.

Conclusions:

  • Spectroscopy can detect noninvasive retinal changes associated with PD.
  • These spectroscopic changes may serve as novel biomarkers for improved PD diagnosis.
  • This technique holds potential for earlier detection of Parkinson's disease.