Reck R, Mika H
Laryngol Rhinol Otol (Stuttg). 1978 Jul;57(7):668-72.
The lateral part of the external auditory meatus is widened by hearing aids. This was found when comparing angles, diameters and volumes of the external auditory meatus in two groups of children. One group of 56 children had bilateral hearing aids, the other group of 48 children of the same age had healthy normal ears and did not use hearing aids. The widening process is increased with the length of time that a hearing aid is used.
助听器会使外耳道的外侧部分变宽。这是在比较两组儿童外耳道的角度、直径和容积时发现的。一组56名儿童佩戴双侧助听器，另一组48名同龄儿童耳朵健康正常，未使用助听器。外耳道变宽的过程会随着使用助听器时间的延长而加剧。
