Final answer:
Trachoma is a major cause of preventable blindness and can be reduced through improved sanitation.
Step-by-step explanation:
Trachoma is a major cause of preventable blindness that can be reduced through improved sanitation.
The bacterium Chlamydia trachomatis causes trachoma. It is transmitted via wastewater and eye-seeking flies in areas with limited access to clean water and sanitation, mainly in Africa and the Middle East.