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The natural history of Vigabatrin associated visual field defects in patients electing to continue their medication .
 Chemical: Vigabatrin; Disease: visual field defects
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: Vigabatrin; Disease: visual field defects