Hearing aid is a technical procedure for a hearing impaired person, thus process is done by using an eclectic method comprising both subjective and objective procedures.A hearing aid is a technical medical device,and we selecting the suitable device for the person according to the different measure such as degree and nature of hearing loss.

Usually, a trial session is done with at least of 2-3 brands of hearing aid so that the person and the optometrist may verify the adequacy of a particular device, depending on the person's lifestyle, detached and psychological requirements, cosmetic preferences, feeling of well-being etc. During the trial period, the person is buoy anted to wear the hearing aid for unmitigated periods. The person can return the new hearing aid after extended-use wearing if they are unsatisfied with the device.

It is a scientific procedure by which a hearing aid is selected for a hearing impaired person, after using an eclectic method comprising both subjective and objective procedures. A hearing aid is a medical device, and selecting the appropriate device for the person depends on different criteria such as degree and nature of hearing loss.