1569
CONCLUSIONS : Ethambutol usage is associated with permanent visual loss and should be avoided if possible or used with caution and proper ophthalmological follow - up .
 Chemical: Ethambutol; Disease: visual loss
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: Ethambutol; Disease: visual loss