We have two ears to tell our brain from which direction sounds are coming from.
If there is hearing loss in both ears, it is usually a good idea to acquire hearing aids for both ears.
If only one ear suffers from hearing loss, we can manage with the other, but with a hearing aid in the defective ear, we can manage even better.
Some important advantages include the following:
- Your ability to localise sounds will improve: you need two ears to tell where sounds come from.
- It is easier to understand speech in noisy surroundings: the brain needs input from both ears in order to separate sounds efficiently.
- You will experience a more complete and comfortable sound picture if you can use both ars: think of mono and stereo sounds. Two ears give you the sense of space and volume.
Source - https://www.hear-it.org/both-ears-are-needed-to-hear-well