Quick Knowledge
Parts of the Ear
- Outer Ear
- Middle Ear
- Inner Ear
Outer Ear consists of
- Pinna/Auricle
- Ear Canal/Auditory Canal
Middle Ear consists of
- Eardrum
- Tympanic Cavity
- Ossicles (malleus, incus, stapes)
Inner Ear consists of
- Oval window
- Semicircular ducts
- Cochlea
- Auditory Tube
Types of Hearing Loss
- Conductive Hearing Loss
- Sensorineural Hearing Loss
- Mixed Hearing Loss
Causes for Conductive hearing loss
- Deformation of outer ear, ear canal, or middle ear structures
- Fluid in middle ear due to cold
- Ear infection
- Allergies
- Poor Eustachian tube function
- Perforated eardrum
- Benign tumors
- Impacted earwax
- Infection in the ear canal
- Foreign body in the ear
- Otosclerosis
Sensorineural hearing loss
- Exposure to loud noise
- Deformation of the inner ear
- Head trauma
- Virus or disease
- Autoimmune inner ear disease
- Hearing loss that runs in the family
- Aging (presbycusis)
- Meniere’s Disease
- Tumors
- Otosclerosis
Degree of Hearing Loss
Normal – (-) 10 dB to 15dB
Slight – 16dB to 25dB
Mild – 26dB to 40dB
Moderate – 41dB to 55dB
Moderately Severe – 56dB to 70dB
Severe – 71dB to 90dB
Profound – 91+dB
Causes for Sensorineural hearing loss
- Exposure to loud noise
- Deformation of the inner ear
- Head traum
- Virus or disease
- Autoimmune inner ear disease
- Hearing loss that runs in the family
- Aging (presbycusis)
- Meniere’s Disease
- Tumors
- Otosclerosis
Types of Hearing Tests
- Pure Tone Audiometry
- Pure Tone Audiometry
- Middle Ear Analysis
- Oto-acoustic Emission
Steps in Audiologic (hearing) Evaluation:
- To check whether there is hearing loss
- To analyze the cause of hearing loss
- To determine the degree & config. Of hearing loss
- To provide best treatment options
Types of Hearing Aid
- Analog
- Digital
Different Styles of Hearing Aid
- IIC – Invisible In Canal
- CIC – Completely In Canal
- ITC – In The Cana
- ITE – In The Ear
- BTE – Behind The Ear
- RIE – Receiver In the Ear
- Pocket Models
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