Table 1:

WHO simplified trachoma grading classification system

Abbreviation	Grade Description
TF	Follicular trachoma: The presence of five or more follicles (.0.5 mm) in the upper tarsal conjunctiva
TI	Inflammatory trachoma: Pronounced inflammatory thickening of the tarsal conjunctiva that obscures more than half of the deep normal vessels
TS	Trachomatous scarring: The presence of easily visible scarring in the tarsal conjunctiva
TT	Trachomatousstrichiasis: At least one lash rubs on the eyeball
CO	Corneal opacity: Easily visible corneal opacity over the pupil