Assertion: trachoma's stage | /r/HasSubevent | opacity
Facets:
Source sentences:
text: Blindness does not ensue until middle age: repeated episodes of infection cause chronic follicular conjunctival inflammation (active trachoma), leading on to the cicatricial stage of tarsal conjunctival scarring, entropion, trichiasis (in-turning of the eyelashes) which leads to corneal scarring and opacity.