Phlyctenular conjunctivitis false is-: (A) The most common cause is tuberculosis, (B) The lesions are typically found near the limbus, (C) Predominantly affects children, (D) Is a type IV hypersensitivity reaction
Answer is A. Tuberculous proteins were considered, previously, as the most common cause. Staphylococcus proteins are now thought to account for most of the cases. Age. Peak age group is 3-15 years. Phlyctenular keratoconjunctivitis is believed to be a delayed hypersensitivity (Type IV-cell mediated) response to endogenous microbial proteins. ref: A K KHURANA OPHTALMOLOGY,E4, Page-77