Research shows
that speech is easier to understand when hearing aids are worn in both ears.
Whether in normal environments or noisy situations, while one hearing aid hones
in on speech, the other diminishes background noise. Two hearing aids also help
with localization or recognizing where sounds are coming from. If you only use one
hearing aid, but have hearing loss in both ears, your brain must process two
different sound and clarity levels, which makes the sound signal more difficult
to understand.