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. Author manuscript; available in PMC: 2015 Feb 1.
Published in final edited form as: Ophthalmic Epidemiol. 2014 Feb;21(1):14–23. doi: 10.3109/09286586.2013.867512

TABLE 4.

Definitions of age-related macular degeneration lesions used globally across all four studies

Lesion Global Definition
Large drusen size ≥ 125 pm in diameter

Large drusen area ≥ 650 pm in diameter

Increased pigment Any AMD related increased pigment

RPE depigmentation Any AMD related RPE depigmentation

Geographic atrophy Area of atrophy ≥350 μm in diameter and presence of at
least 2 of these features: sharp edge, lack of RPE, visible
choroidal vessels, and circular shape

Exudative AMD Presence of any of the following: pigment epithelial
detachment and/or retinal detachment, subretinal
hemorrhage, subretinal scar, subretinal new vessels,
treatment for exudative lesion

AMD, age-related macular degeneration; RPE, retinal pigment epithelium.