What can be done about hearing deficits in one ear?

[littlebellsmum]

Hi
I;m hoping there are some clever people out there who can help - my 5 year old has just been diagnosed as having great hearing in one ear but poor /very poor in the other and it's not glue ear. To be fair, we've suspected a problem for a while as she always switches the phone to her good ear to hear people. Other than that it causes her no problems that we know at all - she's very bright, loves to sing and dance and is doing well at school.
She is being refered to a specialist - I'm just interested to know what can be done if anything?
Thank you!