Evaluating the Differences Between Fluorescein Tear Break-up Time and Noninvasive Measurement Techniques

Area of Science:

• Ophthalmology
• Optometry
• Tear film dynamics

Background:

• Dry eye disease is a prevalent condition affecting tear film stability.
• Accurate assessment of tear film stability is crucial for diagnosing dry eye.
• Traditional fluorescein tear break-up time (BUT) can be invasive and may influence tear film parameters.

Purpose of the Study:

• To compare fluorescein tear break-up time (BUT) with noninvasive BUT measurements.
• To evaluate noninvasive BUT methods using interferometry and corneal topography.
• To determine the diagnostic utility of noninvasive BUT in dry eye patients.

Main Methods:

• Investigated 34 dry eye patients and 16 non-dry eye subjects.
• Measured tear film stability using fluorescein BUT, noninvasive BUT (NIBUT)-DR1 (interferometry), and noninvasive keratographic BUT (NIKBUT) (corneal topography).
• Analyzed correlations and agreement (Bland-Altman) between methods; compared groups and determined diagnostic cut-off values.

Main Results:

• Fluorescein BUT significantly correlated with all noninvasive BUT parameters (NIBUT-DR1, NIKBUT-first, NIKBUT-average).
• Noninvasive BUT measurements yielded higher values than fluorescein BUT.
• Diagnostic cut-off values with varying sensitivities and specificities were established for noninvasive methods.

Conclusions:

• Noninvasive tear film stability measurements are significantly correlated with fluorescein BUT.
• Noninvasive BUT methods demonstrate potential as effective diagnostic tools for dry eye.
• These methods provide valuable, objective data for assessing tear film integrity.