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2. Noise-induced hearing loss - Wikipedia

   en.wikipedia.org/wiki/Noise-induced_hearing_loss

   The ear can be exposed to short periods of sound in excess of 120 dB without permanent harm — albeit with discomfort and possibly pain — but long term exposure to sound levels over 85 dB(A) can cause permanent hearing loss. [31] There are two basic types of NIHL: NIHL caused by acoustic trauma; NIHL that gradually develops.

3. Health effects from noise - Wikipedia

   en.wikipedia.org/wiki/Health_effects_from_noise

   Noise-induced hearing loss is a permanent shift in pure-tone thresholds, resulting in sensorineural hearing loss. The severity of a threshold shift is dependent on duration and severity of noise exposure. Noise-induced threshold shifts are seen as a notch on an audiogram from 3000 to 6000 Hz, but most often at 4000 Hz. [16]

4. Diagnosis of hearing loss - Wikipedia

   en.wikipedia.org/wiki/Diagnosis_of_hearing_loss

   The severity of a hearing loss is ranked according to ranges of nominal thresholds in which a sound must be so it can be detected by an individual. It is measured in decibels of hearing loss, or dB HL. The measurement of hearing loss in an individual is conducted over several frequencies, mostly 500 Hz, 1000 Hz, 2000 Hz and 4000 Hz. The hearing ...

5. 7 Common Symptoms of Hearing Loss + Tests, Treatment ... - AOL

   www.aol.com/7-common-symptoms-hearing-loss...

   Key Takeaways: Common hearing loss symptoms include: turning up the volume, struggling in background noise, asking for repetition, or even withdrawing from social settings due to frustration.

6. Tone decay test - Wikipedia

   en.wikipedia.org/wiki/Tone_decay_test

   A tone at the frequency of 4000 Hz is presented for 60 seconds at an intensity of 5 decibels above the patient's absolute threshold of hearing. If the patient stops hearing the tone before 60 seconds, the intensity level is increased by another 5 decibels with the procedure repeated until the tone can be heard for the full 60 seconds or until no decibel level can be found where the tone can be ...

7. 6 surprising signs of hearing loss - AOL

   www.aol.com/6-surprising-signs-hearing-loss...

   Age-related hearing loss stats, hearing devices: National Institute of Deafness and Other Communication Disorders Health problems and hearing, dementia: National Institute on Aging Hearing loss ...