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
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
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
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
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
CO Corneal Opacity. Easily visible corneal opacity over the pupil. © John Anderson