According to the nature of the lesion, it is divided into two types: organic deafness and functional deafness. The former refers to deafness caused by abnormal tissue structure of the auditory organs, and the latter refers to deafness caused by decreased hearing function.
According to the location of the lesion, it is divided into three types: transvocal (conducting) deafness, sensorine (neurological) deafness, mixed deafness, and deafness caused by abnormal middle ear. The deafness is abnormal from the inner ear to the auditory center. The resulting deafness is sensory, and both are mixed deafness.
Conductive deafness (also known as “transmission deafness”). A hearing loss caused by an abnormality in the structure of the auditory organ associated with the transmission of sound vibrations. Features are: (1) low frequency is greater than high frequency hearing loss. (2) The gap between air conduction hearing loss and bone conduction hearing loss is large. Most people can recover or partially improve their hearing through surgery or medication, and wearing a hearing aid is helpful.
Sensorineural deafness (also known as “neural deafness”)“Perceptual hearing impairment.” Deafness caused by congenital inner ear hypoplasia or lack of sound perception of the inner ear cochlea due to drugs, diseases, and trauma. The treatment of this type of deafness is not good, and its hearing loss is generally more serious than that of transcendental deafness, mostly above 70 decibels. Such deafness can be clearly shown on the audiograms of the bone conduction and air conduction.
According to the time of the lesion, it is divided into two types: congenital deafness and acquired deafness. The fetal deafness caused by various factors during pregnancy and delivery is congenital, and the deafness that occurs after the birth of the fetus is acquired. From the influence of the lesion on the language formation of children, it can also be divided into two categories: pre-speaking (4 years ago) deafness and post-linguistic deafness.
Before the language:Deafness that occurs when a child is born or shortly after birth (4 years ago). Since you can’t hear others, you can’t learn words and language like normal children. The educational requirements of such deaf children are very different from those of children who have developed language. They usually focus on the acquisition of language and communication methods.
After learning the language:After the formation of speech and language, deafness occurs (usually after 4). The education of such deaf children should emphasize maintaining their original understandable language and appropriate sentence patterns, making full use of existing speech experiences to facilitate the psychological development of such children.
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