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Walk the Even Hospital Database by book and chapter — the raw source passages that ground Ask, DDx, and the rest.

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contentuptodate· Content· item f26_57_27540

©2013 UpToDate ® Print Email Active trachoma: follicles and their sequelae A) WHO grade TF (trachomatous inflammation, follicular). To make a diagnosis of WHO grade TF, five or more white or yellow follicles >0.5 mm must be visualized on the upper tarsal conjunctiva. B) Herbert's pits. Herbert's pits are shallow pits in the cornea that form as a result of follicle rupture. They are pathognomonic for trachoma but are not assessed in the current grading scheme.