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Collector channels in normal and POAG eyes. (A) Average number of CCs increases in normal (n = 3) and POAG (n = 3) eyes when pressure increases from 10 to 20 mm Hg. Number of open and partially open CCs increases in normal eyes from 10 to 20 mm Hg but does not change in POAG eyes. (B) Number of totally occluded CCs increases nearly 4-fold in POAG eyes at 20 mm Hg compared to normal eyes at 20 mm Hg.
