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Clinical parapapillary atrophy (PPA) evaluation of 2 patients. A) Total PPA clock hours, 12; βPPA clock hours, 5; βPPA as percentage of disc, 60%; βPPA present, temporal; ordinal rating of total PPA, 3. B) Total PPA clock hours, 8; βPPA clock hours, 4; βPPA as percentage of disc, 20%; βPPA present, temporal; ordinal rating of total PPA, 2.
