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Hearing and Balance Centre: 2011 Hearing Awareness Week - Hearing Protection: the Dangers of Noise Exposure - Patrice Johnson
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Hearing and Balance Centre: 2011 Hearing Awareness Week - Hearing Protection: the Dangers of Noise Exposure - Patrice Johnson

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Call or visit one of our clinics: …

Call or visit one of our clinics:

Darlinghurst Centre
St Vincent's Hospital
Victoria St
Darlinghurst NSW 2010
Ph: 1300 134 327
Fax: (02) 8382 3092

Double Bay Centre
4/5 Goldman Lane
(Between Knox St and Knox Lane)Double Bay NSW 2038
Ph: (02) 9327 3908
Fax: (02) 8382 3092

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  • Impulse noise is a one off loud sound Acoustic trauma normally occurs at levels greater than a 140 dB A weighting for the way human perceive mid range continuous sounds (60dB equal loudness curve) C weighting for the way humans perceive impluse (very loud) sounds (80dB flatter on equal loudness curve) LC = 140dB
  • For example, aeroplane is 120dB at 25 metres away. DISTANCE : This is a result of the inverse square law.
  • This is the world health organisation recommendations As the sound level increases 3dB the exposure length halves.
  • requiring high level of concentration
  • Transcript

    • 1. Patrice Johnson Hearing Protection: the Dangers of Noise Exposure
    • 2.
      • Outer ear: Ear canal
      • Middle ear: Ear drum (tympanic membrane)
      • Ossicles
      • Inner ear: Cochlea
      • Semi-circular canals
      • Auditory nerve
      The Ear
    • 3. How we hear
    • 4.
      • Outer ear: Ear canal
      • Middle ear: Ear drum (tympanic membrane)
      • Ossicles
      • Inner ear: Cochlea
      • Semi-circular canals
      • Auditory nerve
      The Ear
    • 5. How we hear
    • 6.
      • Outer ear: Ear canal
      • Middle ear: Ear drum (tympanic membrane)
      • Ossicles
      • Inner ear: Cochlea
      • Semi-circular canals
      • Auditory nerve
      The Ear
    • 7. How we hear
    • 8.                                            
    • 9. Noise
      • What is noise?
      • Different sources:
        • Occupational:
          • Mining
          • Building industry
        • Recreational:
          • Personal stereos e.g. Ipods
          • Power tools
          • Lawn mowers
          • Motor sports
          • Night clubs
          • Concerts
    • 10.
      • Risk of damage depends on:
      • Level of noise
      • Time of exposure (how long and how often)
      • Pitch (frequency) of sounds can also effect the degree of damage. High pitch more damaging.
      Noise
    • 11. How much noise?
      • Sound at a distance:
        • As the distance is doubled from the sound source the sound level decreases 6dB SPL
        • As the distance is halved from the sound source the sound level increases 6dB SPL
      • What does this mean?
        • Further you are from the noise source, the better
    • 12.
      • Hearing damage risk is negligible below 75 dB
      • A vacuum cleaner emits about 85dB
    • 13. Noise Levels Exposure Length: For every 3dB louder, the sound is twice as strong so the exposure time should halve.
    • 14. iPods Safe exposure limit is 85 decibels for eight hours a day. 100dB = 15min Cory Portnuff/Dept. of Speech, Language and Hearing Science, University of Colorado; Brian Fligor/Children's Hospital Boston and Harvard Medical School
    • 15. iPod listening time vs % volume Cory Portnuff/Dept. of Speech, Language and Hearing Science, University of Colorado; Brian Fligor/Children's Hospital Boston and Harvard Medical School
    • 16. Personal stereos
      • Ipods at low volumes are fine
      • Ipods at high volumes for long periods of time can damage your hearing
    • 17. What happens when sounds are too loud?
      • Causes damage to the hair cells in the cochlea
      • This means softer sounds may no longer be transmitted
    • 18. Cochlear Hair Cells Healthy Damaged
    • 19.
      • Permanent
      • Hearing Loss
      • The effect of repeated noise exposure on hearing is usually permanent .
      • Hair cells can not repair themselves. There is no cure for this hearing loss.
      • Temporary
      • Hearing Loss
      • Noise can temporarily cause a hearing loss by “tiring out” the hair cells
      • First signs: ringing in the ears after noise exposure.
    • 20. Typical hearing loss from noise exposure
    • 21. Hearing Loss and Noise Exposure
    • 22.
      • Ability to hear soft and medium high pitch tones eg. birds, mobile ringing, is lost
      • Missing beginning or end of a word or sentence
      • Conversations in a group or busy environment e.g. restaurant, meetings
      • Difficulties to differentiate similar words
      • Musical difficulties: melody and pitch discrimination
      How high frequency hearing loss impacts hearing
    • 23. Judging harmful noise levels
      • Noise is as loud or louder than heavy traffic
      • You have to raise your voice to speak to someone 1 metre away
      • Things sound different after you’ve been exposed to noise
      • You hear ringing or other noises in your ears after you’ve been exposed to noise
    • 24. Noise Induced Hearing Loss (NIHL)
      • Can NIHL be detected early?
      • Early signs of temporary hearing loss
        • Tinnitus
        • Muffled hearing e.g. After a loud concert
      • Usually goes undetected until it affects the ability to follow conversations in noisy environments e.g. Restaurant
    • 25. NIHL
      • Does Noise-Induced Hearing Loss cause Any Pain?
        • Generally no
        • Only very loud sounds such as a bomb result in pain
        • General loud sounds e.g. lawnmower do not cause pain, but can result in hearing loss
    • 26. Impact of Hearing Loss
      • The Listen Hear! Report (Access Economics February 2006):
      • Financial cost to Australia of $11.75 billion per annum or 1.4% of GDP
      • 1 in 6 Australians is affected by hearing loss
      • Expected to increase to 1 in every 4 Australians by 2050
      • With 36% of hearing loss attributable to excessive noise exposure
    • 27. Protecting Your Hearing
      • Avoid loud noises/ music
      • Wear earplugs when exposed to loud noise/music (eg. Concert and motor races)
      • Loud music can be just as dangerous as noisy machinery.
      • Balls of cottonwool or paper tissue won’t protect your hearing.
      • Learn to fit earplugs correctly. Poorly fitted earplugs offer little protection.
    • 28. Protecting Your Hearing
      • Ear Plugs
        • Foam disposable ear plugs
        • Musician’s ear plugs – 3 levels of attenuation and allow music or voice to be monitored
        • Noise plugs
        • Ear muffs
    • 29. Summary
      • Impact on hearing determined by:
        • How long
        • How loud
        • How often
      • Avoid loud sounds
      • Use hearing protection
    • 30. Questions
      • Any Questions?