<prompt> Cause of blindness in trachoma-ScarringPannusChronic dacrocystitisEntropion  <response>: Trachoma is a leading cause of preventable blindness worldwide, Conjunctival scarring which may be irregular, star-shaped or linear. Linear scar present in the sulcus subtarsalis is called Arlt;s line. ref : A K KHURANA text of Ophtalmology,E4, page-64 