Longitudinal Tracking of Photoreceptor Integrity in Neovascular AMD: Early Restoration Predicts 24-Month Structural...

Area of Science:

• Ophthalmology
• Retinal Diseases
• Macular Degeneration

Background:

• Neovascular age-related macular degeneration (nAMD) is a leading cause of vision loss.
• Longitudinal characterization of photoreceptor layer integrity is crucial for understanding disease progression and treatment response.
• Current treatments aim to inhibit vascular endothelial growth factor (VEGF) but long-term structural and visual outcomes require further investigation.

Purpose of the Study:

• To longitudinally track changes in photoreceptor bands over 24 months in nAMD patients.
• To determine if early restoration of these bands predicts long-term structural and visual outcomes.
• To identify specific photoreceptor layers that are early indicators of treatment success.

Main Methods:

• A prospective study of treatment-naïve nAMD patients receiving anti-VEGF therapy with a 3 + pro re nata (PRN) regimen.
• Quantification of outer nuclear layer (ONL), ellipsoid zone (EZ), external limiting membrane (ELM), and interdigitation zone (IZ) at multiple time points up to 24 months.
• Statistical analysis to assess associations between early band restoration and subsequent structural and visual outcomes.

Main Results:

• All measured photoreceptor bands exhibited significant changes over the 24-month study period.
• The ellipsoid zone (EZ) demonstrated the earliest significant restoration, observed at 1 week and 1 month post-treatment.
• Restoration of ONL, EZ, ELM, and IZ at month 3 predicted 1- and 2-year structural outcomes.
• Month 2 outer nuclear layer (ONL) changes independently predicted long-term ONL structural recovery.
• Early restoration of IZ and ONL at months 3 and 2, respectively, predicted improvements in best-corrected visual acuity (BCVA) at 1 and 2 years.

Conclusions:

• Photoreceptor band restoration patterns are layer-specific, with the EZ showing the most rapid initial recovery.
• Early structural recovery in photoreceptor bands, particularly ONL and IZ, between months 2 and 3 is a significant predictor of long-term visual function.
• These findings highlight the potential of early structural changes as biomarkers for predicting visual prognosis in nAMD.