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The former patient had complained once that his visual acuity had decreased after the termination of IFN therapy, and the latter patient complained twice during IFN therapy that his visual acuity had decreased.
 adverse event: after 
Please tell me event type and its trigger word from given type options. Output format is "type: trigger".  Option: adverse event, potential therapeutic event 
Text: {0} 
Answer:
 adverse event: after 