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What is Herbe's pits are seen in: and explain in detail?
Trachoma Also called Egyptian ophthalmia is caused by chlamydia trachomatis. Serotypes, A, B, Ba and C are associated with hyperendemic (blinding) trachoma. Most common mode of trachoma spread is through fomites and flies. Reservoir of infection are children with active disease. It is responsible for 15-20% of world's blindness. Leading cause of preventable blindness in the world. Incubation period varies from 5 to 21 days Conjunctival reaction in trachoma is both follicular (conjunctival follicles) and papillary (papillary hyperplasia) Herbe follicles refer to typical trachoma follicles present in the limbal are (pathognomic) Herbe's pits: cicatrized follicles at the superior lumbus. Note Arlt's line: it is thick band of scar tissue in the palpebral conjunctiva of the eye, near the lid margin seen in cicatrizing trachoma