Very powerful microscopes were needed before cells could be observed in detail
I hope this can help some.
I believe you're looking for "invasive species"
There are several ways to treat or cope with presbycusis (age-related hearing loss). Here are some of ways:
1. Hearing Aid(s)
2. Implants (Cochlea, Middle ear) - involves surgical operation
3. Lip reading or speech reading training
4. Hearing assistive devices - sound amplifying devices (cellphones, tablets, etc.)
It would be best to refer to an audiologist or otolaryngologist to for extensive diagnostic evaluation of the gravity of hearing loss and seek proper medical treatment.
