The final assessment of efficiency of the hearing aid can be given only after the corresponding and rather long training (not less than 2 weeks). During this time the patient has to accustom with the new sound environment, get used to the loud sounds of the perceived speech and environment (the device strengthens all reaching sounds) worsening in the beginning legibility of the perceived speech.
The hearing aid should use gradually, in the beginning in a silent situation, in conversation with one interlocutor, then in more noisy room and in conclusion — at the general conversation.
At heavy degree of relative deafness when the patient perceives only the loud speech at an ear, hearing aid is expedient only after preliminary activation of hearing speech exercises by means of the special electrointensifying equipment. For this purpose also the hearing aid can serve. Such activation has rastormazhivayushchy effect on acoustical area of a cerebral cortex.
It is very important to combine these exercises with training in reading from lips or, more correctly, from a face. At systematic training this training yields so good results that visual perception of the speech replaces with some patient speech hearing.
In those cases when the patient perceives only shout at an auricle, activation of hearing is carried out by means of ear trumpets with gradual lengthening (use hose tubes of various length) distances between the patient and speaking for 3 — 6 months.
Very perspective method is binaural hearing aid. It creates stereophonic effect and at a number of patients increases percent of legibility of the speech.