<prompt> Cause of blindness in trachoma -ScarringpannusChronic dacrocystitisEntropion  <response>: The later structural changes of trachoma are referred to as cicatricial trachoma. Rubbing of eye lashes of scarred eye lids against the cornea leads to corneal opacities and scarring and then to blindness. Ref: Parsons 22nde p.172-174 21ste p.172-174; Khurana 7the p.67 4the p.62-64 