The greatest single cause of infectious blindness is

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Trachoma is the greatest single cause of infectious blindness worldwide, accounting for about 15% of all cases of blindness. It is caused by Chlamydia trachomatis infection and can lead to trichiasis (inward turning of the eyelashes) and corneal scarring, which can result in irreversible blindness. Neonatal gonorrheal ophthalmia, keratoconjunctivitis, and pinkeye can also cause blindness, but their overall contribution is lower than trachoma.

The Greatest Single Cause of Infectious Blindness Is