Which test evaluates tear film stability after fluorescein instillation?

Prepare for the NBEO Part III Test with detailed quizzes on patient encounters and performance skills. Access flashcards and questions with explanations to enhance your study strategy. Perfect your skills for exam success!

Multiple Choice

Which test evaluates tear film stability after fluorescein instillation?

Explanation:
Tear film stability is assessed by timing how long the tear film remains continuous after a blink when fluorescein is used. In this test, a small amount of fluorescein is instilled, the patient blinks to distribute it, then you measure the interval from the last blink to the first appearance of a dry spot on the cornea under cobalt blue light. The longer this tear break-up time, the more stable the tear film is; a short time indicates instability, often seen in dry eye or evaporative conditions. The other options don’t measure this stability: the Schirmer test gauges tear production, TearLab measures tear osmolarity, and sodium fluorescein is the dye used—not a stand-alone stability test.

Tear film stability is assessed by timing how long the tear film remains continuous after a blink when fluorescein is used. In this test, a small amount of fluorescein is instilled, the patient blinks to distribute it, then you measure the interval from the last blink to the first appearance of a dry spot on the cornea under cobalt blue light. The longer this tear break-up time, the more stable the tear film is; a short time indicates instability, often seen in dry eye or evaporative conditions. The other options don’t measure this stability: the Schirmer test gauges tear production, TearLab measures tear osmolarity, and sodium fluorescein is the dye used—not a stand-alone stability test.

More Multiple Choice Questions
Subscribe

Get the latest from Passetra

You can unsubscribe at any time. Read our privacy policy