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The current study investigated the visual fields and visual electrophysiology of eight patients with known vigabatrin - attributed visual field loss , three of whom were reported previously .
 Chemical: vigabatrin; Disease: visual field 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: vigabatrin; Disease: visual field loss