certain sounds and words, because the frequency
range that is lost is that of conversation. Turning
up the volume on the television and perceptions
that other people are mumbling are also signs of
hearing loss. There are no known methods for
preventing presbycusis. Hearing aids often
improve hearing ability, though the progressive
loss of hearing may eventually exceed the capabil-
ity of the HEARING AID.
See also AGING, OTOLARYNGOLOGIC CHANGES THAT
OCCUR WITH; NOISE EXPOSURE AND HEARING; OTOTOXIC-
ITY; PRESBYOPIA.46 The Ear, Nose, Mouth and Throat