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Physiology of hearing and hearing loss

Question
17 out of 39
 

According to WHO classification, for severe degree of Impairment of hearing is at: (AIIMS Nov 2011)



A 26-40 dB
B 41-55 dB

C 56-70 dB
D 71-91 dB

Ans. D 71-91 dB Ref. Dhingra 5th/ed pg 43, 6th/ed p 38 (Table 5.9)

Hearing loss and difficulty in hearing speech

WHO classification of degree of hearing Loss and Difficulty in Hearing Speech

Hearing threshold in better ear (average of 5,00, 1000, 2000 Hz)

Degree of impairment

(Who classification)

Ability to understand speech

0-25

26-40

41-55

56-70

71-90

Above 91

Not significant

Mild

Moderate

Moderately severe

Severe

Profound

No sifinificant difficulty with faint speech

Difficulty with faint speech

Frequent difficulty with normal speech

Frequency difficulty even with loud speech

Can undertstand only shouted or amplified speech

Usually cannot understand even amplified speech

Hearing loss is impairment of hearing and its severity may vary from mild to severe or profounD.

Deafness: It is used when there is little or no hearing at all.

WHO Definition of, Deaf'

The term deaf should be applied only to those individual whose hearing impairment is so severe that they are unable to benefit from any type of amplification.

According to Ministry of social welfare, Govt of IndiA.

Deaf are those in whom the sense of hearing is non functional for ordinary purposes of life.

They do not- hear/understand sounds at all even with amplified speech.

The cases included in this category are those who have either loss more than 90dB hearing loss in better ear or total hearing loss in both ears.

Partially hearing are those falling under anyone of the following categories

Category

Hearing

Mild impairment

Serious impairment

Severe impairment

Between 30-45 dB in better ear

Between 45-60dB in better ear

Between 60-90 dB in better ear

Physiology of hearing and hearing loss Flashcard List

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