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Age-related macular degeneration (AMD) 6-level severity scale used in the study of incidence of age-related macular degeneration (IAMD) of the Study of Osteoporotic Fractures (SOF).
RPE=Retinal pigment epithelium
No AMD = level 10 or 20 in both eyes
Early AMD = level 30 or 40 in at least one eye, but neither levels 50 or 60 in either eye
Late AMD = level 50 or 60 in at least one eye
