In the context of genes, this describes a genetic condition that varies between people who have it – they may show different signs or symptoms.
The hole drilled through an earmould is known as a vent. A vent allows air to circulate in the ear and improves comfort. Occasionally a vent is used to change the frequency response of the hearing aid.
Part of the body's balance system. The vestibular system is made up of three semi-circular fluid filled canals in the inner ear. The vestibular system is responsible for maintaining your body's orientation in space, regulating movement and keeping objects in visual focus as you move around.
A device that changes sounds from electrical signals into vibrations.
Visual Response Audiometry (VRA)
This is a behavioural test suitable for children from six months to about two and a half years. An audiometer plays sounds of different frequencies and loudness through speakers. When the child hears the sound, they will turn their head when a visual "reward" is activated, such as a toy lighting up or a puppet. It can test the full range of hearing and can give specific information about each ear.