| Category | Type of Impairment | DB Level | Speech discrimination | % age of Impairment |
|---|---|---|---|---|
| I | Mild hearing impairment | DB 26 to 40 dB in better ear | 80 to 100% in better ear | Less than 40% |
| II (a) | Moderate hearing | 41 to 60 dB in better ear | 50 to 80% in better ear | 40% to 50% |
| II (b) | Severe hearing impairment | 61 to 70 dB hearing impairment in better ear | 40 to 50% in better ear | 51% to 70% |
| III | a)Profound hearing impairment b) Total deafness |
71 to 90 dB 91 dB and above/in better ear/to hearing |