http://revach.net/article.php?id=5004

Section: Stories   Category: Gadlus
Rav Shlomo Zalman Auerbach Reads His Mother The Megila Out Of Respect

Rav Shlomo Zalman Auerbach held L'Halacha that hearing by Krias Megilas Esther through a hearing aid one could not be Yotzei. Rav Shlomo Zalman's mother Tzivya was hard of hearing and wore a hearing aid (see story). When Rav Shlomo Zalman became Bar Mitzva he learned how to read the Megila so that he can read it for his hearing impaired mother.

On Purim his mother would remove her hearing aid and Rav Shlomo Zalman would read the megila with all his might close to her ear so that she could be Yotzei. He continued this for many decades.

After many years of practicing this minhag one of Rav Shlomo Zalman's children mentioned to him that he doesn't think his mother can really hear all the words despite his best efforts. Rav Shlomo Zalman answered him, know my son that I never imagined that she hears the Megila K'Halacha. All that I do for my mother is only to make her feel good and to honor her. (Halichos Shlomo Orchos Halacha 2:29:1)