TränenfilmBreakupTime
Tränenfilm Breakup Time, commonly abbreviated TBUT, refers to the interval between a complete blink and the first appearance of a disruption in the tear film on the ocular surface. It is a measure of tear film stability and is used in the evaluation of dry eye disease and ocular surface health. The term is frequently translated as tear film breakup time (TBUT) in English-language literature.
TBUT can be measured by two primary methods: fluorescein tear breakup time (FTBUT) and non-invasive tear breakup
Normal TBUT values depend on age and population, but a common reference is greater than about 10
TBUT results can be influenced by technique, lighting, dye concentration (for FTBUT), environmental conditions, and blinking
TBUT is a core element of dry eye assessment and is incorporated in diagnostic criteria such as