Types of Deafness

According to age at onset of deafness
-- Congenitally Deaf
-- Adventitiously Deaf


According to language Development
-- Pre-lingually Deaf
-- Post-lingually Deaf


According to place of impairment
-- Conductive hearing loss
-- Sensory-neural hearing loss
-- Mixed hearing loss


According to the degree of hearing loss
-- Slight 27-40 dB HL
-- Mild 41-55 dB HL
-- Moderate 56-70 dB HL
-- Severe 71-90 dB HL
-- Profound 91 dB HL above