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What is Threshold for moderate hearing loss - and explain in detail?
Ans. is 'c' i.e., 41-55 dB o WHO recommended the following classification on the basis of pure tone audiogram.Hearing threshold in better ear (average of 500,1000,2000Hz)Degree of impairment (WHO classification)Ability'to understand speech0-25Not significantNo significant difficulty' with faint speech26-40MildDifficulty' with faint speech.41-55ModerateFrequent difficulty with normal speech.56-70Moderately severeFrequent difficulty' even with loud speech71-91SevereCan understand only shouted or amplified speechAbove 91ProfoundUsually cannot understand even amplified speech