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The causes of this disease are roughly divided into two types: infectious and non-infectious. Infectious causes are pathogens like tuberculosis, syphilis, herpes that get into the eye; non-infectious causes are mostly immune system problems, such as autoimmune diseases or rheumatic diseases, or trauma, or genetics (like HLA-B27) can increase the risk. It is very important to find out which type it is, because the treatment direction is completely different. Our family ran many tests to figure out the cause, and every time waiting for results was very anxious.