Cookie Bite Hearing loss is different to the more common type of hearing problems. It is so named because it looks like a bite has been taken out of the spectrum or so they say. More often with hearing loss it is the higher frequencies that are affected.
In my case I can still hear birdsong, even without my hearing instruments thankfully, the big problem is with speech. My most common saying is probably "Pardon" or "Please can you say that again"
The picture below shows my hearing spectum. As you can see a mid range frequencies it is considerably attenuated.
Speach frequences range from approximately 300 Hz to 3400 Hz, right in the middle of the 'bite'
It is a form of Sensorineural hearing loss which occurs when the hair cells in the inner ear and/or the auditory pathway to the brain are damaged
Of course I have Hearing Aids, I have had several over the years, but although they are improving they do not seem to be designed for Cookie Bite Hearing.
It is very hard to hear speech when there is any backgound noise as it tends to be drowned out by the background.
As it happens in the late sixties I worked for a while in the Acoustics department at the Central Electricity Research Laboratories (CERL) in Leatherhead, where they were studying the impact of noise on workers in the CEGB power stations.
I learned that how much excessive noise could damage my hearing, so for example when I was near the stage at gigs in the sixties by The Who I would use some ear defence, even if it was only cotton wool stuffed into my ears (PS Don't do that, these days you can easily buy purpose built ear defenders.)
It seems that it was my genes and not The Who that caused the problem.
What I really want is hearing instruments that are designed for cookie bite hearing and that actually reduce (or don't amplify) the high frequencies.
As I wrote this I found The Cookiebite chronicles