Hearing impairment is a total or partial hearing loss and limited ability to hear. The major causes of hearing loss are genetical predispositions, age, infections, injuries and others.
Degree of hearing loss:
mild hearing loss 26 – 40 dB
moderate hearing loss 41 – 55 dB
moderately severe hearing loss 56 – 71 dB
severe hearing loss 71 – 91 dB
profound hearing loss, over 91 dB
According to the World Health Organization, hearing impairment ranks the second in the leading causes of disabilities. The degree of hearing loss significantly affects a persons’s ability to master spoken language and to learn through verbal communication. A person with severe hearing loss has broken social relationships, a slight hearing loss does not ususally cause such a disturbance. In Slovakia there is 5 – 7 % of population registered as deaf or with hearing loss.