That is, based on the sounds the letters make rather than on the actual letters. To be in the Deaf World, one does not actually have to be deaf but have similarities to the culturally Deaf. Deafened - An umbrella term that can used to refer to any individual with a depressed ability to use audition. Commonly noted as dB. A decibel is a unit of measurement used to express logarithmic ratios of intensity, power, pressure, etc. Glaucoma - occurs when the body produces too much fluid or liquid inside the eye or when normal drainage of the fluid malfunctions.
Pressure then builds inside the eye, causing damage and gradually destroying vision.
The underlying cause is not known, although in some cases the tendency to develop glaucoma is thought to be inherited. Hard of Hearing - A depressed ability to use audition that may disrupt everyday activities though generally not bad enough to halt such activity. This organization provides services and information for youths and adults who are Deaf-Blind. Merely signing is not considered interpreting. A hearing aid with all components encased in the earmold or in a case designed to fit entirely in the ear.