Sandbox:dinesh

Practice here

Introduction

Deafness is a partial or total inability to hear. WHO defines deafness as hearing threshold of 20dB or better in both ears.

Classification

[Deafness] may be classified according to WHO into 5 subtypes/groups:

• Mild- Hearing losses between 26 and 40 dB
• Moderate- Hearing losses between 41 and 55 dB
• Moderately severe- Hearing losses between 56 and 70 dB
• Severe - Hearing losses between 71 and 90 dB
• Profound - Hearing losses greater than 91 dB