**4. Classification**

Trachoma has always been an important blinding disease under consideration of WHO and thus many attempts have been to streamline its clinical profile. The latest classification sug‐ gested by WHO in 1987 with the acrimony FISTO is as follows:

**1.** TF: Trachomatous inflammation-follicular is the stage of active trachoma with predomi‐ nantly follicular inflammation. To diagnose this stage at least five or more follicles (each 0.5mm or more in diameter) must be present on the upper tarsal conjunctiva. Further, the deep tarsal vessels should be visible through the follicles and papillae.

