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. Author manuscript; available in PMC: 2019 Jul 1.
Published in final edited form as: Am J Ophthalmol. 2018 May 9;191:140–148. doi: 10.1016/j.ajo.2018.04.021

Figure 1:

Figure 1:

Example of manual delineation and automated identification of retinal pigment epithelial (RPE) tips and Bruch’s Membrane (BM). Left: Manual delineation on an optic nerve head photograph and on an individual B-scan (middle). Alpha (α) parapapillary atrophy (PPA) is located between the white and blue arrows (RPE tip). Beta (β) PPA is located between blue (RPE tip) and yellow (BM) arrows. Gamma (γ) PPA is located between the yellow and red arrows. Right: Automated delineation of βPPA area is located between the BM (blue dots) and RPE tips (white dots). Clinical βPPA (manual dashed yellow line to white dots) cannot distinguish between βPPA & gamma PPA, as the BM is only visible with OCT.