Advanced OCT imaging that visualizes blood vessels in the retina and optic nerve without injecting dye.
OCT angiography (OCTA) is an advanced imaging technology that creates detailed maps of blood vessels in the retina and optic nerve head without needing injected dye. It combines OCT technology with motion detection to visualize blood flow.
Key Takeaways
- Visualizes retinal blood vessels non-invasively
- No dye injection needed
- Shows blood flow at different depths
- Quick, comfortable scan
- Useful for vascular and optic nerve conditions
How It Works
- Uses OCT technology
- Detects motion of blood cells
- Creates maps of blood vessel networks
- Different depths can be analyzed separately
Why It's Done
- Evaluate optic nerve blood flow
- Detect vascular abnormalities
- Assess macular conditions
- Monitor glaucoma
- Research applications in neuro-ophthalmology
Advantages Over Fluorescein Angiography
| OCTA | Fluorescein Angiography |
|---|---|
| No dye injection | Requires IV dye |
| Can be repeated easily | Side effects from dye |
| Depth-resolved images | Surface view mainly |
| Quick scan | Longer procedure |
| No allergy risk | Allergy risk with dye |
What to Expect
- Same setup as regular OCT
- Chin on rest, focus on target
- Multiple scans acquired
- Computer processes images
- Takes 5-10 minutes
Limitations
- Limited field of view
- Motion artifacts can affect quality
- Cannot show leakage (unlike FA)
- Technology still evolving
- Interpretation requires expertise
In Neuro-Ophthalmology
- Research tool for optic nerve conditions
- Assess papilledema
- Evaluate ischemic conditions
- Growing applications
Medical Disclaimer: This information is for educational purposes only and does not replace professional medical advice.
Medically Reviewed Content
This article meets our editorial standards
- Written by:
- Hashemi Eye Care Medical Team
- Medically reviewed by:
- Board-Certified Neuro-Ophthalmologist (MD, Neuro-Ophthalmology)
- Last reviewed:
- January 30, 2025