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Photomicrographs of the encapsulated bleb following trabeculectomy (A), and Ahmed valve implantation (B) showing fibrodegenerative changes in the inner layer (black arrowhead) and outer fibrovascular layer (white arrowhead) (H&E, ×100). The ratio of outer fibrovascular layer thickness to inner fibrodegenerative layer thickness was approximately 3 : 1 in both groups.
