Hearing loss is a common problem caused by noise, disease, aging, illness, and genetics. General signs of hearing loss occurs suddenly and develops gradually that includes asking people to repeat themselves, listening to music or television with a higher volume than required. There are two main types of hearing loss depending on where the problem lies they are conductive hearing loss, sensorineural hearing loss.
Sensorineural is caused by damage to the auditory nerve that occurs naturally with age. There are several options that help to improve a person’s ability to hear and communicate which includes digital hearing aids, cochlear implants, middle ear implants, bone anchored implants, wireless devices, etc. The 35delG mutation was detected in 11/ 712 unrelated blood donors.
The actual number may be even higher, however, because children up to age 14 were not included in the study, and also because the WHO sets a lower threshold (25 dB) for the definition of hearing impairment. Of those 900 million hearing impaired in the world in 2025, some 90 million will be Europeans. Anteunis (1999) found hearing impairment in up to 20% of adults (some 52 million people in Europe) and in 36% of people then aged 55 years and older.