Table 1 Definition and characteristics on grades of hearing impairment according to level of hearing loss, listening performance and recommendation [9]
Grades of Hearing Impairment | Corresponding Audiometric ISO Value (dBHL) | Listening Performance | Recommendations |
|---|---|---|---|
0: no impairment | ≤ 25 both ears | No or very slight hearing problems. Able to hear whispers | None or hearing conservative care |
1: slight impairment | 26–40 (better ear or both ears) | Able to hear and repeat words spoken in normal voice at 1 m | Counseling May need Hearing aids |
2: moderate impairment | 41–60 (better ear or both ears) | Able to hear and repeat words using raised voice at 1 m | Usually recommend for Hearing aids |
3: severe impairment | 61–80 (better ear or both ears) | Able to hear some words when shouted into better ear | Hearing aids needed. If no hearing aids available, lip-reading should be taught |
4: profound impairment (deafness) | ≥ 81 Both ears | Unable to hear and understand even a shouted voice | Hearing aids may help in understanding words. Additional rehabilitation needed. Lip-reading and sometimes signing essential |