Indiana Bleb Appearance Grading (IBAGS)
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| Morphologic Classification of Filtering Blebs after Glaucoma Filtration Surgery: The Indiana Bleb Appearance Grading Scale |
Four parameters are assessed at the slit lamp, using a narrow beam, against a standardized photographic set of blebs.
(1) Bleb height: this describes the maximal vertical elevation of the bleb: flat, low, medium, or high.
(2) Horizontal extent: the maximal horizontal extent is described relative to limbal clock hours: <1 hr, 1–2 hr, >2–<4 hr, and >4 hr.
(3) Vascularity: five simple categories are elaborated: white and avascular, cystic and avascular (with microcysts), mild vascularity, moderate vascularity, and extensive vascularity.
(4) Seidel leakage: in the testing for a bleb leak with a fluorescein strip at the slit lamp, the bleb is categorized as showing no leak, multiple pinpoint leaks without streaming, or brisk streaming within 5 seconds.
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