THE EAR:
Any source of sound sends vibrations or sound waves into the air. These funnel through the ear opening, down the ear canal, and strike the eardrum, causing it to vibrate. The vibrations are passed to the small bones of the middle ear (ossicles), which transmit them to the hearing nerve in the inner ear. Here, pressure changes cause hair cells to move which become nerve impulses that go directly to the brain, which interprets the impulses as sound.
- Excessive noise can permanently damage the hair cells in the inner ear causing noise induced hearing loss:
- Noise induced hearing loss can not be cured, but it can be stopped by reducing noise exposure.
- If you think you have experienced a hearing loss, go to an audiologist for a hearing test (audiogram).
- Always wear hearing protection whenever you are using a noisy piece of equipment.
Hearing Protection:
Compressible Foam Ear Plugs:
- Claimed noise reductions up to 30 decibels.
- Roll between your fingers to compress and gently insert into the ear canal. Let it expand. Ensure there is a snug fit.
- Throw away when dirty.
Non-Compressible Foam Ear Plugs (reusable):
- Claimed noise reductions up to 30 decibels.
- Insert gently for a sung fit.
- Always wash before reuse. Throw away when damaged.
Ear Muffs:
- Claimed noise reductions up to 25 decibels.
- Ensure good seal around the ears.
- Make sure nothing – hair, glasses – is in the way.
- Keep them clean.
