In humans, what is the normal TFBUT in healthy individuals versus those with evaporative tear disease (EDED)?

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Study for the ACVIM Small Animal Internal Medicine Exam to enhance your veterinary knowledge. Prepare with flashcards and multiple-choice questions, featuring hints and explanations. Ensure success in your exam journey!

Multiple Choice

In humans, what is the normal TFBUT in healthy individuals versus those with evaporative tear disease (EDED)?

Explanation:
Tear film break-up time (TBUT) assesses how stable the tear film is after blinking. After a blink, the time until the first sign of tear film disruption appears is measured, usually with fluorescein under a slit lamp. In healthy individuals, TBUT is typically in the low teens, commonly around 13 seconds, reflecting a stable lipid-primed tear film. Evaporative tear disease, driven by meibomian gland dysfunction, reduces the lipid layer and speeds up evaporation, so TBUT becomes markedly shorter, often a few seconds. A value around 13.1 seconds for normal and about 3.7 seconds for evaporative tear disease fits these expected ranges, making it the best choice. The other options imply either an unrealistically long TBUT in health or a less plausible shortening in disease that doesn’t align with the typical pattern of evaporative dry eye.

Tear film break-up time (TBUT) assesses how stable the tear film is after blinking. After a blink, the time until the first sign of tear film disruption appears is measured, usually with fluorescein under a slit lamp. In healthy individuals, TBUT is typically in the low teens, commonly around 13 seconds, reflecting a stable lipid-primed tear film. Evaporative tear disease, driven by meibomian gland dysfunction, reduces the lipid layer and speeds up evaporation, so TBUT becomes markedly shorter, often a few seconds. A value around 13.1 seconds for normal and about 3.7 seconds for evaporative tear disease fits these expected ranges, making it the best choice. The other options imply either an unrealistically long TBUT in health or a less plausible shortening in disease that doesn’t align with the typical pattern of evaporative dry eye.

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