The human ear detects sound across a wide range of frequencies – from the deepest, rumbling base to high pitched, squealy tones.
When people suffer from hearing loss, not all frequencies are affected in equal measure. Someone may have a hard time hearing sounds in certain frequency areas while having normal or even excellent hearing in others. This is why hearing loss is individual.
Because hearing loss
typically develops slowly and in varying degrees across frequencies, it may take some time, even years, before the affected person realizes that he or she needs hearing aids