What is the normal NIBUT in healthy humans compared with humans with 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

What is the normal NIBUT in healthy humans compared with humans with EDED?

Explanation:
NIBUT measures how long the tear film remains stable on the eye without touching the surface. In healthy eyes, the tear film is more stable, so NIBUT is longer. In evaporative dry eye disease, lipid layer abnormalities and increased evaporation destabilize the tear film, leading to earlier breakup and a shorter NIBUT. The pair given most accurately reflects this pattern: a healthy eye around 24 seconds and an eye with evaporative dry eye around 14–15 seconds. Specifically, 24.2 seconds in a healthy eye versus 14.9 seconds in EDED fits the expected decrease in tear-film stability with this condition. Other options imply either an abnormally longer NIBUT with disease or flip the order, which doesn’t align with how evaporative dry eye reduces tear stability.

NIBUT measures how long the tear film remains stable on the eye without touching the surface. In healthy eyes, the tear film is more stable, so NIBUT is longer. In evaporative dry eye disease, lipid layer abnormalities and increased evaporation destabilize the tear film, leading to earlier breakup and a shorter NIBUT.

The pair given most accurately reflects this pattern: a healthy eye around 24 seconds and an eye with evaporative dry eye around 14–15 seconds. Specifically, 24.2 seconds in a healthy eye versus 14.9 seconds in EDED fits the expected decrease in tear-film stability with this condition.

Other options imply either an abnormally longer NIBUT with disease or flip the order, which doesn’t align with how evaporative dry eye reduces tear stability.

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