A 28-year-old man presents to a remote community health center in a rural area, complaining of bilateral eye irritation and a gritty sensation that has been progressively worsening over the past week. He notes a thick, yellowish discharge, especially noticeable upon waking, making his eyelids stick together. He denies significant eye pain but reports increased light sensitivity and excessive tearing. He recently returned from a humanitarian mission trip in a region known for endemic ophthalmic infections. His medical history is unremarkable, though he recalls experiencing similar, less severe episodes during his childhood. On examination, his vital signs are stable with a temperature of 37.00C, blood pressure of 118/72 mmHg, pulse of 68/min, and respirations of 14/min. His ocular examination reveals significant conjunctival hyperemia with pronounced swelling of the upper eyelids. Slit-lamp evaluation demonstrates prominent lymphoid follicles on the superior tarsal conjunctiva, as well as evidence of early neovascularization extending from the limbus into the superior cornea. There is no evidence of corneal ulceration. Given this clinical presentation, what is the most likely diagnosis and the most appropriate long-term management strategy to prevent disease progression?

An 8-year-old girl, recently arrived from a rural village in a sub-Saharan African country, presents to a community health clinic with a history of persistent eye irritation and progressive vision changes over several months. Her mother reports the child frequently rubs her eyes and complains of a foreign body sensation. On examination, there is significant inflammation of the conjunctiva, with some thickening, and when the upper eyelid is everted, discrete, small, pale follicles and early scarring are noted, similar to the image shown in Figure A. The eyelashes appear to be turning inward in one eye. Based on these findings, what is the most likely diagnosis and the appropriate initial medical management?