A Simplified Classification for Age-Related Macular Degeneration Based on Optical Coherence Tomography.

Area of Science:

• Ophthalmology
• Medical Imaging
• Biomarkers

Background:

• Optical coherence tomography (OCT) identifies age-related macular degeneration (AMD) biomarkers.
• Current AMD grading relies on color fundus imaging, necessitating a more integrated OCT-based approach.
• A simplified OCT grading scheme is needed for clinical and research synchronization.

Purpose of the Study:

• To establish a standardized OCT-based classification for AMD.
• To balance diagnostic accuracy with practicality for clinical and research settings.
• To facilitate communication and synchronization of AMD grading directly from OCT imaging.

Main Methods:

• Spectral-domain OCT scans were graded by two retinal specialists using the Stanford OCT-Based AMD Classification (SOAC).
• Discrepancies were resolved by a third independent specialist.
• Inter-grader agreement was assessed using weighted kappa coefficients.

Main Results:

• The study included 109 eyes from 108 patients (mean age 79.61 years).
• SOAC classified AMD stages including normal aging, early AMD, intermediate AMD, neovascular AMD (nAMD), geographic atrophy (GA), and combined nAMD/GA.
• Excellent inter-grader agreement was achieved with a weighted kappa of 0.95 (95% CI: 0.92-0.98).

Conclusions:

• The Stanford OCT-Based AMD Classification (SOAC) offers a standardized, reliable framework for AMD grading.
• High inter-grader agreement supports its validity and practicality for clinical and research applications.
• SOAC enables consistent disease staging and facilitates integration into longitudinal studies and phenotype refinement.