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Total geographic atrophic area and segmented geographic atrophy area by zone 1 to zone 6. (A) Total atrophic area, (B) zone 1, (C) zone 2, (D) zone 3, (E) zone 4, (F) zone 5, and (G) zone 6. Yellow region indicates manually measured atrophic area based on light blue autofluorescence image. Each zone was defined as doughnut shape area divided by distance of 1 mm from foveal center.
