听力损失及防治ppt课件

ural/ retrocochlear ), mixed hearing loss 听力损失分类耳聋分级( WHO1980 ) 500 、 1000 、 2000Hz 平均听阈?轻度聋: 26 ~ 40dB ?中度聋: 41 ~ 55dB ?中重度聋: 56 ~ 70dB ?重度聋: 71 ~ 90dB ?极重度聋: >91dB 听力残疾-WHO ? Disabling hearing impairment in adults should be defined as a permanent unaided hearing threshold level for the better ear of 41 dB or greater ; ? Disabling hearing impairment in children under the age of 15 years should be defined as a permanent unaided hearing threshold level for the better ear of 31 dB or greater . The “ hearing threshold level ” is to be taken as the better ear average hearing threshold level for the four frequencies 0.5, 1, 2 and 4 kHz. 听力损失早期诊断的重要性一、听力损失与言语发育的关系二、早期干预的前提一、听力损失与言语发育的关系 1、言语发育对听力的依赖性学习言语的基本条件: 健全的大脑良好的听觉完好的发音器官 2、耳聋发生时间和言语发育的关系 1岁, 3岁, 7-8 岁, 成年后聋哑语音语调异常音调音量失控