聾児の残存聴力及びその利用について

　Ⅰ．緒言

　聾唖に関する医学的な研究は1880年頃にBell，Mygind等によって始められた。其後我が国に於ても多くの業績が報告されている。併し戦前の報告に比較すると戦後のそれは甚だ少なく我が国に於ても松山^1）の報告の他，極めて少数の報告がされているに過ぎない状態であつた。

　併し最近Otology，或はAndiologyの発達と共に再び聾の問題が研究されようとする傾向が生じて来た事は誠に当を得たものと言わざるを得ない。

　Abatract Fifty two students of the school for the deaf were chosen as the subject of study and they were divided into two groups; one of which comprising of those who had fairly good speech dilivery and the other consisting of those who were poor. In both groups the deafness was noted from the standpoint of whether it was acqu'red or cogenital; and if acquired, the state in which the redisual hearing may or may not be present with its corresponding amounts. The following results were obtained: 1. The speech dilivery was fairly good in cases of acquired deafness where residual hearing was found.

　2. The later the onset of deafness was the speech dilivery to be better.

　3. Fowler's method of residual hearing determination is applicable when the hearing loss is below 90% of the normal.