3. Literature Review
We need to get the basic information about hearing handicap before we start to teach and train them. There are many differences for people with hearing impairment as a result of defect or lack of hearing sense. According to Smith et al. [11], hearing impairment is a generic term that has frequently been used to cover the entire range of hearing loss. Deafness describes a severe hearing loss until speech cannot be understand through the ear alone, with
or without aids, that badly affect a child’s educational performance. Hearing loss is often measured in decibel (dB). Hard of hearing individuals are lost from 25 to 90 dB, whereas those with losses greater than 90 dB are considered as deaf. Hearing loss also can be grouped to four categories, which are conductive hearing loss, unilateral hearing
loss, mild bilateral sensorineural hearing loss and moderate-to-severe bilateral sensorineural hearing loss. Each type of hearing loss also has associated symptoms and difficulties in teaching and learning.