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About sound

Hearing Potential

Cochlear Implant

Benefits

> Learning about Cochlear Implants > Hearing Potential > Levels

The degree of hearing loss refers toa decrease in the sensitivity to sound
or alternatively an increase in threshold for detecting a sound.

Typically a hearing loss is described as the average hearing loss from the thresholds measured at 500, 1000 and 2000 Hz
(Three Frequency Average - 3FA)

Normal Hearing
3FA threshold between 0-20 dB HL.

Mild Hearing Loss
3FA threshold between 25-40 dB HL.

Moderate Hearing Loss
3FA threshold between 40-70 dB HL.

Severe Hearing Loss
3FA threshold between 70-90 dB HL.

Profound Hearing Loss
3FA threshold over 90 dB HL.

Often, persons with profound hearing loss are referred to as "deaf".

With a mild or moderate hearing loss, a person may benefit from the use of hearing aids.

With a severe or profound hearing loss even loud sounds may be difficult to understand. Making sounds louder or increasing the level of amplification does not enable such an ear to process sound. In most cases, a doctor or audiologist will recommend that the person be evaluated for a cochlear implant.