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Full visual electrophysiology , including flash electroretinography ( ERG ) , pattern electroretinography , multifocal ERG using the VERIS system , electro - oculography , and flash and pattern visual evoked potentials , was undertaken .
 None
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:
 None