Comm Eye Health Vol. 17 No. 52 2004 pp 68. Published online 06 December 2004. WHO simplified trachoma grading system Related content TF Trachomatous Inflammation – Follicular. The presence of five or more follicles in the upper tarsal conjunctiva. © John Anderson TI Trachomatous Inflammation – Intense. Pronounced inflammatory thickening of the tarsal conjunctiva that obscures more than half of the normal deep tarsal vessels. © Allen Foster TS Trachomatous Scarring. The presence of scarring in the tarsal conjunctiva. © Hugh Taylor TT Trachomatous Trichiasis. At least one eyelash rubs on the eyeball or evidence of recent removal of inturned eyelashes. © WHO CO Corneal Opacity. Easily visible corneal opacity over the pupil. © John Anderson Previous article in this issue