McCallan's classification McCallan in 1908 divided the clinical course of<unk>  into four stages: Stage 1 (incipient<unk>  Stage 2 (established<unk>  Stage 3 (cicatrising<unk>  Stage 4 (healed<unk>  Hyperaemia of palpebral conjunctiva Appearance of mature follicle & papillae Scarring of palpebral conjunctiva Disease is cured or is not markable Immature follicle Progressive corneal pannus Scars are easily visible as white bands Sequelae to cicatrisation cause symptoms WHO classification The World Health Organization recommends a simplified grading system for<unk> . The Simplified WHO Grading System is summarized below:<unk> tous inflammation, follicular (TF)—Five or more follicles of >0.5 mm on the upper tarsal conjunctiva<unk> tous inflammation, intense (TI)—Papillary hypertrophy and inflammatory thickening of the upper tarsal conjunctiva obscuring more than half the deep tarsal vessels<unk> tous scarring (TS)—Presence of scarring in tarsal conjunctiva.<unk> tous trichiasis (TT)—At least one ingrown eyelash touching the globe, or evidence of epilation (eyelash removal) Corneal opacity (CO)—Corneal opacity blurring part of the pupil margin
Trachoma
Nasal polyp
Orbital emphysema
Isthmicoma
Nasal vestibulitis
Acalvaria
Blepharitis
Tympanosclerosis