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Two patients who developed decreased visual acuity after several months of ethambutol treatment for Mycobacterium avium - intracellulare infection had bitemporal visual field defects that suggested optic chiasm damage .
 adverse effect: bitemporal visual field defects, ethambutol; adverse effect: decreased visual acuity, ethambutol
Given options, please tell me the relationships of all the listed entity pairs.Output format is "relation1: word1, word2; relation2: word3, word4". 
Option: adverse effect 
Text: {0} 
 Entity Pairs:  bitemporal visual field defects, ethambutol; decreased visual acuity, ethambutol 
Answer:
 adverse effect: bitemporal visual field defects, ethambutol; adverse effect: decreased visual acuity, ethambutol