Abstract
We present the current status of the fitting and evaluation processes for the hearing aids prescribed at the hearing aids clinic of Kitasato University Hospital. The indications for a hearing aid were considered following general otological examination and hearing tests. During the fitting process, evaluation of the hearing aids, hearing tests and subjective evaluation were performed. Evaluation of the hearing aids was performed by adjusting the maximum output level and insertion gain of the tested hearing aid. Input and output function was recorded for the nonlinear hearing aids. Real ear insertion gain was evaluated as an objective and practical parameter. Pure-tone audiometry, speech discrimination test, and audiological tests for recruitment phenomenon are essential. The uncomfortable loudness test was also useful. Evaluation of hearing was done by comparing the aided and non-aided hearing levels. Fitting was considered to be ideal when the mechanical evaluation and hearing test results were balanced. Subjective evaluation of hearing was done using the hearing questionnaire 2002. This questionnaire has been found to be useful for detecting and solving fitting problems at the outpatient clinic and also for analyzing the effectiveness of hearing aids as well.
