An instrument for quantifying meibomian lipid on the lid margin: the Meibometer

Area of Science:

• Ophthalmology
• Biomedical Engineering
• Tear Film Dynamics

Background:

• Meibomian glands produce lipids essential for tear film stability.
• Accurate measurement of meibomian lipids is crucial for diagnosing and managing ocular surface diseases.
• Existing methods for lipid measurement may have limitations in accessibility or precision.

Purpose of the Study:

• To describe a novel instrument, the Meibometer, for quantifying meibomian lipids.
• To assess the reliability and reproducibility of the Meibometer.
• To evaluate the rate of meibomian lipid delivery during blinking.

Main Methods:

• Adaptation of a commercial skin surface lipid measurement instrument.
• Utilizing a plastic tape loop to collect lipid from everted lower eyelid margins.
• Measuring lipid quantity via changes in light transmission using a photometer.
• Assessing lipid recovery rate after cleaning, correlated with blink frequency.

Main Results:

• The Meibometer provides reliable readings unaffected by side, time of day, or lid temperature.
• The measured recovery rate of meibomian lipid per 10 blinks was 33.7 +/- 5.8% of the pre-cleaned level.
• Lipid delivery during blinking appears sufficient for complete tear film resurfacing.
• No significant lipid delivery was detected in the absence of blinking.

Conclusions:

• The Meibometer is a viable tool for estimating casual meibomian lipid levels.
• The rate of meibomian lipid secretion supports the dynamic nature of the tear film.
• Understanding lipid dynamics is key for advancing the diagnosis and treatment of Meibomian Gland Dysfunction (MGD).