Abstract
How to use the most of residual hearing is an important problem to every child whose hearing is severely impaired.
This study was attempted to find out how they are using aid in a unselected group of 68 so-called deaf children and to investigate how they should use hearing aid properly and effectively.
The findings considered in this study can be summarized as follows.
(1) There are some children who did not response to pure tone from audiometer through receiver, but responsed to sound from loud speaker in free field with powerful hearing aid. Their hearing loss are supposed above 90dB, and it should be emphasized that exercise and training of hearing is important even in case of these severe hearing impairment.
(2) Typical mobern Japanese hearing aid has so small acoustic gain that it is not so effective to severe hearing loss. They should use more powerfully amplified hearing aid.
(4) Correct and effective using method, should be taught to young hearing aid user and their parents.
