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To evaluate 2 recently described grading systems for clinical grading of filtering surgery blebs: the Moorfields Bleb Grading System (MBGS) and the Indiana Bleb Appearance Grading Scale (IBAGS). Observational comparative study. Twenty-four glaucoma filtering blebs in 24 eyes of 17 patients. Three observers in a prospective agreement study compared MBGS with IBAGS during slit-lamp examination...