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Glaucoma has been called the "silent thief of sight" because the loss of vision often occurs gradually over a long period of time, and symptoms only occur when the disease is quite advanced
•Cholesteatoma is an important cause of conductive hearing loss that is locally destructive but benign in growth.
•Otitis media any inflammation of the middle ear, without reference to etiology or pathogenesis
•Types of hearing loss
1. Conductive hearing loss
2. Sensorineural hearing loss
3. Mixed hearing loss