The Retina as a Window into the Brain
Placeholder: retina shares developmental origin and pathology with the brain.
- Neural: Tissue origin (Placeholder embryology note)
- Non-surgical: Access method (Placeholder imaging note)
- Amyloid & tau: Shared pathology (Placeholder overlap note)
- OCT/Fundus: Imaging modality (Placeholder modality note)
Retina-brain developmental link
Placeholder: retina as an outgrowth of the diencephalon.
Rationale for ocular biomarkers
Placeholder: accessible proxy for otherwise invasive brain assessment.
Amyloid Beta in Retinal Layers
Placeholder: amyloid plaques found in retinal nerve fiber and ganglion layers.
- RNFL/GCL: Deposit location (Placeholder layer note)
- Curcumin fluor.: Detection method (Placeholder fluorescence note)
- Moderate: Correlation w/ PET (Placeholder correlation note)
- Early clinical: Study stage (Placeholder maturity note)
Detecting amyloid signal in vivo
Placeholder: fluorescent ligand imaging of retinal amyloid.
Comparing to cerebral amyloid burden
Placeholder: retinal signal tracked against PET SUVR.
Retinal Vasculature as a Brain Health Proxy
Placeholder: vessel narrowing and density loss mirror cerebral small vessel disease.
- Caliber/density: Vessel metric (Placeholder metric note)
- OCT-A: Imaging tech (Placeholder OCT angiography note)
- Cerebral SVD: Association (Placeholder association note)
- Small-moderate: Effect size (Placeholder effect note)
Vascular signatures of neurodegeneration
Placeholder: microvascular rarefaction as shared pathology.
OCT angiography measurements
Placeholder: quantifying vessel density changes non-invasively.
Non-Invasive Optical Imaging Techniques
Placeholder: OCT and fundus photography as low-cost screening instruments.
- <5 min: Scan time (Placeholder scan duration note)
- Much lower: Cost vs PET (Placeholder cost note)
- Micron-scale: Resolution (Placeholder resolution note)
- Optometry clinics: Deployment (Placeholder deployment note)
OCT structural imaging pipeline
Placeholder: cross-sectional retinal layer imaging workflow.
Fundus photography workflow
Placeholder: wide-field imaging for vascular assessment.
Screening Potential and Its Limits
Placeholder: retinal imaging as a triage tool, not a diagnostic replacement.
- Moderate: Sensitivity (Placeholder sensitivity note)
- Moderate: Specificity (Placeholder specificity note)
- Pre-screening: Role (Placeholder role note)
- PET/CSF: Gold standard (Placeholder confirmatory note)
Positioning as a triage tool
Placeholder: identifying candidates for further testing.
Need for confirmatory diagnostics
Placeholder: PET and CSF remain the diagnostic standard.
Placeholder: retinal imaging complements, does not replace, confirmatory testing.