Glossary

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Tinnitus(also: Ringing in the Ears)

Tinnitus is the perception of sound - most commonly ringing, buzzing, or hissing - without a corresponding external source. It can be continuous or intermittent, uni- or bilateral, and ranges from mild background nuisance to severely disabling. Tinnitus is often associated with…

Traumatic Brain Injury(also: TBI, Acquired Brain Injury, Head Injury)

An injury to the brain caused by an external bodily force, typically from road traffic accidents, falls, or other impacts. TBI severity is classified using the Glasgow Coma Scale (GCS): mild (GCS 13-15), moderate (GCS 9-12), and severe (GCS 3-8), with additional factors…

Tritanomaly(also: Tritan Anomalous Trichromacy)

A rare type of colour vision deficiency where the short-wavelength (blue) cone cells have a shifted sensitivity range. Tritanomaly results in reduced ability to distinguish blue from yellow. It is the rarest form of anomalous trichromacy and is less commonly addressed in…

Tritanopia(also: Tritan Dichromacy, Blue-Blind)

A rare type of colour vision deficiency caused by the complete absence of short-wavelength (blue) cone cells in the retina. People with tritanopia have difficulty distinguishing blue from yellow and blue from green. Tritanopia is much less common than protan or deutan CVD types…

Tunnel Vision(also: Peripheral Vision Loss, PVL)

A visual impairment characterized by the loss of peripheral vision while central vision may remain intact, resulting in a narrow field of view as if looking through a tunnel. Tunnel vision can be caused by conditions such as retinitis pigmentosa, glaucoma, or stroke. It…

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