Lecture 10 Hearing Impairments
•What are the major parts of human ear?
•What is the severity classifications based on?
•hearing acuity and frequency response
•are measured in terms of decibels (dB) and hertz (Hz).
•What is a decibel?
•a unit of intensity or loudness
•The number of decibels indicates the degree of loudness.
•What does the frequency
•The cycles per second or frequency of sounds, hertz (Hz), indicates the pitch of
sound. Most English sounds fall in the range of 500 to 2000 Hz, the speech
•What is a common way to classify individuals who are hearing impaired?
•by the degree of hearing impairment, whether mild, moderate, severe, or pro-
•What do intensity (dB) and sound frequency (Hz) determine?
•Measures of loss of sound determine the extent of the hearing impairment.
•What is hearing impairment?
•a generic term indicating a hearing disability that may range in severity from
mild to profound
•What are the hearing impairments subsets?
•hard of hearing person
•What is the definition of deaf?
•unsuccessful processing of linguistic information through audition, with or with-
out a hearing aid
•what is the definition of hard-of-hearing?
•successful processing of linguistic information through audition with the use of a
•How do you classify the severity of hearing impairments?
•Mild (25-40 dB)= Hard of hearing
•Moderate (40-60 dB) =Hard of hearing
•Severe (60-90 dB) = Hard of hearing
•Profound ( 90 dB or more ) = Deaf
•What is the classification of site of loss?
•conductive hearing loss
•sensorineural hearing loss
•What is the classification of time of onset ?
•Congenital - present at birth
•Adventitious - acquired later in life, pre lingual or post lingual
•What is the prevalence of hearing impairment?
•5% of school age children have hearing outside the normal limits
•What is the etiology of hearing impairments?