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and Aim: Nowadays, auditory perception is not a complete method to assess vowels quality and we need to use more objective instruments. In this study we want to determine and compare the persian vowels formants in normal and hearing Impaired students in 79ـ year old children of Isfahan. Materials and Methods: This cross sectional study was performed on 64 normal and hearing impaired students. Background information was by interview and then, vowel production test was performed. First threefatcat:iq4hgblj7ncqphrx5zdfhq6wie