Which tear film stability test uses fluorescein dye?

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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

Which tear film stability test uses fluorescein dye?

Explanation:
Fluorescein dye–based tear film breakup time uses fluorescein to visualize the tear film and detect where it breaks up after a blink. After instilling fluorescein, you have the patient blink and then observe under cobalt blue light; the first dark spot indicating tear film disruption marks instability, and the time from the blink to that breakup is the tear film breakup time. This directly assesses tear film stability because it shows how long the tear film remains continuous before breaking up. Noninvasive TBUT measures stability without dye by analyzing reflections, Schirmer assesses tear production rather than stability, and tear osmolarity measures tear film solute concentration.

Fluorescein dye–based tear film breakup time uses fluorescein to visualize the tear film and detect where it breaks up after a blink. After instilling fluorescein, you have the patient blink and then observe under cobalt blue light; the first dark spot indicating tear film disruption marks instability, and the time from the blink to that breakup is the tear film breakup time. This directly assesses tear film stability because it shows how long the tear film remains continuous before breaking up. Noninvasive TBUT measures stability without dye by analyzing reflections, Schirmer assesses tear production rather than stability, and tear osmolarity measures tear film solute concentration.

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