Eyelid inflammation caused by the Chlamydia trachomatis bacterium, known as trachoma. The disease is the leading cause of preventable blindness in the world today and has infected humans for millenia.... more 
Eyelid inflammation caused by the Chlamydia trachomatis bacterium, known as trachoma. The disease is the leading cause of preventable blindness in the world today and has infected humans for millenia. less 
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LiveScience.com | Photo By CDC/ Susan Lindsley
Fri, Apr 19, 2013 1:40 PM EDT