Deafness means difficulty hearing noise. It can be mild, moderate, severe or profound. for example, people with mild deafness have some difficulty following speech, mainly in noisy situations. Those with moderate deafness have difficulty following speech without a hearing aid.
People who are severely deaf rely a lot on lip-reading, even with a hearing aid. British Sign Language (BSL) may be their first or preferred language. Profoundly deaf people need to lip-read to understand speech. BSL may be their first or preferred language.
Deafness can cause difficulty communicating and people who are deaf may be at risk of physical and social isolation. They are also at greater risk of accidents because they may not hear warning alarms and sirens.
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