What Is Fundus Autofluorescence and How Can It Help Diagnose and Track Dry AMD?
Introduction: Why FAF Matters in Modern AMD Care
Fundus autofluorescence (FAF) is one of the most powerful imaging tools available for understanding dry age-related macular degeneration (AMD). FAF visualises the metabolic activity of the retinal pigment epithelium (RPE)—the cell layer essential for photoreceptor survival. Unlike standard retinal photos, FAF reveals early biochemical changes before structural damage becomes visible.
At Peter Ivins Eye Care in Bearsden—home to Scotland’s first ZEISS CLARUS 500—FAF is a cornerstone of our AMD diagnostic and monitoring pathway. It is especially critical within The Valeda Clinic, where accurate classification of RPE health helps determine suitability for Valeda photobiomodulation (PBM) and guides long-term monitoring.
Led by Craig McArthur, a national key opinion leader in AMD imaging and analysis, our clinic integrates FAF with OCT, OCT-A, and AI-driven progression tools for world-class macular care.
What Is Fundus Autofluorescence?
FAF imaging detects naturally occurring fluorescent signals emitted by lipofuscin, a by-product that accumulates in RPE cells over time.
FAF highlights:
- RPE stress (hyperautofluorescence – bright areas)
- RPE cell loss or atrophy (hypoautofluorescence – dark patches)
- Early patterns signalling future geographic atrophy (GA)
- Zones of metabolic instability linked to dry AMD progression
FAF is uniquely valuable because it visualises cellular health, not just anatomy.
Fundus Autofluorescence (FAF) at Peter Ivins Eye Care: The Power of the ZEISS CLARUS 500
Peter Ivins Eye Care was the first practice in Scotland to use the ZEISS CLARUS 500—an ultra-widefield, true-colour retinal imaging system with advanced FAF capabilities.
What makes the CLARUS 500 exceptional:
- True-to-life colour photography integrated with FAF
- Blue autofluorescence (BAF) and green autofluorescence (GAF) options
- Ultra-widefield views to capture far-peripheral changes
- High resolution of drusen, pigment shifts, and RPE defects
This precision allows us to map subtle patterns that predict AMD progression long before vision is affected.
What Fundus Autofluorescence (FAF) Reveals in Dry AMD
Hyperautofluorescent rings, patches, or mottled patterns suggest stressed RPE cells—an early warning sign.
Hypoautofluorescent areas represent lost RPE cells. FAF identifies GA earlier and more accurately than colour photos.
3. Patterns Predictive of Progression
Certain FAF patterns—such as banded or diffuse hyperautofluorescence—are associated with a higher risk of:
- GA development
- GA enlargement
- Functional deterioration
4. Reticular Pseudodrusen (RPD)
Although better visualised on OCT, RPD often produce characteristic FAF signatures.
Fundus Autofluorescence (FAF) vs Other Imaging Modalities
While OCT shows structure, FAF shows cellular metabolism. Both are needed for complete AMD care.
| Imaging Type | What It Shows | Why It Matters |
| FAF (CLARUS 500) | RPE stress/atrophy | Detect GA and risk before vision loss |
| OCT (CIRRUS 6000) | Cross-sectional anatomy | Measure drusen volume, PEDs, photoreceptor integrity |
| OCT-A | Blood flow | Rule out or monitor wet AMD |
| True-colour photography | Structural pigment/drusen patterns | Baseline documentation + patient education |
Together, these provide a complete picture of your macular health.
FAF in The Valeda Clinic: Guiding PBM Suitability
FAF plays a critical role in deciding whether photobiomodulation is appropriate and predicting likely outcomes.
FAF helps identify:
- Patients with stressed but still functioning RPE (ideal PBM candidates)
- Early GA that may benefit from metabolic support
- Advanced atrophy where PBM is unlikely to help
- Areas to monitor closely during PBM treatment cycles
Craig McArthur combines FAF with OCT, OCT-A, and AI analysis to produce a personalised PBM suitability score.
What Happens During FAF Imaging?
A FAF scan is quick and fully non-invasive.
Steps:
- You’re seated comfortably at the CLARUS 500.
- A target light helps you fixate.
- The camera captures high-resolution FAF images using blue or green excitation light.
- Results are analysed immediately.
There is no discomfort, and no contact with the eye.
How FAF Helps Track AMD Over Time
FAF is ideal for mapping progression because it captures subtle changes invisible to traditional imaging.
At each follow-up, we evaluate:
- Expansion of GA borders
- New hyperautofluorescent activity (RPE stress)
- Redistribution or enlargement of drusen
- Stability after PBM cycles
- Effects of nutritional or lifestyle interventions
With ZEISS Retina Workplace and Altris AI, we can compare FAF scans side-by-side across months or years with pixel-level precision.
When FAF Suggests PBM May Be Helpful
PBM may be recommended when FAF shows:
- Patchy hyperautofluorescence around drusen
- Early RPE stress patterns
- Preserved photoreceptors but declining function
- Intermediate AMD with soft drusen or PEDs
PBM is not used where FAF reveals:
- Extensive hypoautofluorescent GA
- RPE collapse
- Signs of wet AMD activity (requiring anti-VEGF care)
Book Now
…we can help you understand your baseline, your risk, and your options.
📞 Call us: 0141 943 3300
📍 Visit our clinic in Bearsden, Glasgow
📅 Book a Valeda Assessment online
Learn more at www.valedascotland.co.uk
For more information about Valeda treatment visit:
FAQ’s
Does FAF use radiation?
No. FAF uses safe light-based imaging.
Is it painful?
No—there is no light flash or contact with the eye.
Can FAF detect wet AMD?
FAF helps show RPE stress but OCT/OCT-A are used to diagnose wet AMD.
How often should I have FAF imaging?
Most dry AMD patients benefit from FAF every 6–12 months. If having Valeda treatment measurements will be repeated every 4 months.