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Mild hearing loss is thresholds of 25–45 dB; moderate hearing loss is thresholds of 45–65 dB; severe hearing loss is thresholds of 65–85 dB; and profound hearing loss thresholds are greater than 85 dB. Tinnitus occurring in only one ear should prompt the clinician to initiate further evaluation for other etiologies.
The optic nerve can be damaged when exposed to direct or indirect injury. Direct optic nerve injuries are caused by trauma to the head or orbit that crosses normal tissue planes and disrupts the anatomy and function of the optic nerve; e.g., a bullet or forceps that physically injures the optic nerve.
A cochlear implant can also be used to treat unilateral hearing loss in many countries. The device is surgically implanted in the cochlea of non-hearing ear, with a sound processor worn externally. Using electrical stimulation of the cochlea, sound is sent to the hearing nerve and onto the brain. [14]
Of these, one stands out due to its prevalence: sensorineural hearing loss. This type of hearing loss, which affects the inner ear or the nerve pathways from the inner ear to the brain, is a ...
Sensorineural hearing loss (SNHL) is a type of hearing loss in which the root cause lies in the inner ear, sensory organ (cochlea and associated structures), or the vestibulocochlear nerve (cranial nerve VIII). SNHL accounts for about 90% of reported hearing loss.
Hearing loss is a partial or total inability to hear. [5] Hearing loss may be present at birth or acquired at any time afterwards. [6] [7] Hearing loss may occur in one or both ears. [2] In children, hearing problems can affect the ability to acquire spoken language, and in adults it can create difficulties with social interaction and at work. [8]
Viral diseases of the ear can cause sensorineural hearing loss usually as the consequence of labyrinthitis. The person may be generally unwell at the time. Measles may cause auditory nerve damage but usually gives rise to a chronic middle ear problem giving rise to mixed hearing loss. Mumps (Epidemic parotitis) may result in profound ...
This can affect one ear or both ears. On audiometry, the hearing loss is characteristically low-frequency, with higher frequencies being affected later. [7] Sensorineural hearing loss (SNHL) has also been noted in patients with otosclerosis; this is usually a high-frequency loss, and usually manifests late in the disease. The causal link ...
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