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Community Eye Health. 2004; 17(52): 68.
PMCID: PMC1705737

WHO simplified trachoma grading system

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TF Trachomatous Inflammation – Follicular The presence of five or more follicles in the upper tarsal conjunctiva

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TI Trachomatous Inflammation – Intense Pronounced inflammatory thickening of the tarsal conjunctiva that obscures more than half of the normal deep tarsal vessels

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TS Trachomatous Scarring The presence of scarring in the tarsal conjunctiva

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TT Trachomatous Trichiasis At least one eyelash rubs on the eyeball or evidence of recent removal of inturned eyelashes

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CO Corneal Opacity Easily visible corneal opacity over the pupil


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