Patient: now 5 years old, test results: 100dB in the right ear and 40dB in the left ear, want to wear hearing aids, how to choose? A: Is the hearing test pure tone audiometry or brainstem evoked potentials? 100dB hearing loss with hearing aids is not too good. This is the analysis based on the pure tone audiometry results. Of course, if the family’s economic conditions allow both sides to wear hearing aids will be better, so that the sound source localization will be helpful. Patient: The hearing test is brainstem evoked potential. If I wear the right ear instead of the left, will it cause hearing loss in the left ear? A: A 5 year old child can try pure tone audiometry, which is more beneficial for hearing aids if the child is well coordinated. In addition to the effect of otitis media on hearing, the incidence of otitis media is very high in children of this age and can be confirmed at the hospital.