Even in the last century, doctors believed that if one ear hears, then nothing can prevent the development of the functions of speech and language, but the latest research has been argued against this belief. Unilateral hearing loss among children creates a number of functional problems in development. For instance, a child with partial hearing impairment behaves quite well at home in a calm environment, but the same child may have great difficulties in a noisy classroom. Even if teachers, parents and experts believe that today a child with hearing impairment does not experience this problem, do not forget that the unrecoverable unilateral hearing loss can have a significant influence on the health and full person’s functioning in the near future.
The arguments supporting the importance of binaural hearing are definitely clear. Objective evidence show that children with unilateral hearing loss have serious problems in a noisy environment; they have an incorrect speech development. The brain system, which provides hearing and speech functions, develops in the first 5−10 years of life. This fact forces parents to decide on the hearing repair in childhood at an early age. It often happens that if the hearing is not developed in the first years of life, the brain cannot fully develop later, which limits the child in the future. These handicaps may be evident in primary school. With unilateral hearing loss, the child can hear, but only in a very quiet environment. In a noisy class, child’s hearing and productivity may be reduced by almost 50%. Children with unilateral hearing loss are 10 times more likely to have problems with behavior than their binaural peers.