Generally we lose the high pitch sounds first which means that although we can still hear noises around us we do not have enough information for us to to interpret the sounds into speech we can understand.
The unimpaired ear hears all the sounds around it and the brain can decide what is important and what to ignore, so a good hearing system can provide lots of information for you to listen to and analyse.
it will allow you to get all of the sound around you and choose what is important.
WORDS START TO MISS IMPORTANT SOUNDS
As the impairement grows, as well as obvious sounds like ticking clocks and birdsong, we lose parts of the words.
We can still hear that there is speech but because there are bits missing the words merge together into a jumble and we feel like everyone is mumbling to us.
Being sble to amplify just the bits that you are missing allows the modern well fitted hearing system to fill in the gaps in your hearing.
The sooner you start this process the easier it is to get the best results.