Extracts from the Ministry of Welfare Notification
| S.No. |
Category |
Type of Impairment |
dB level and/or |
Speech discrimination |
Percentage of impairment |
| 1 |
I |
Mild hearing impairment |
20 to 40 dB in better ear |
80 to 100% in better ear |
Less than 40% |
| 1 |
I |
Mild hearing impairment |
20 to 40 dB in better ear |
80 to 100% in better ear |
Less than 40% |
| 2 |
II |
Moderate hearing impairment |
41 to 55 dB in better ear |
50 to 80% in better ear |
40% to 50% |
| 3 |
III |
Severe hearing impairment |
56 to 70 dB hearing impairment in better ear |
40 to 50% in better ear |
50% to 75% |
| 4 |
IV |
(a) Total deafness |
No hearing |
No discrimination |
100% |
| |
|
(b) Near total |
91 dB and above in better ear |
-do- |
100% |
| |
|
(c) Profound hearing impairment |
71 to 90 dB |
Less that 40% in better ear |
75% to 100% |