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Tear film lipid layer thickness as a function of blinking
D R Korb1, D F Baron, J P Herman
1Schepens Eye Research Institute, Boston, Massachusetts.
Cornea
|July 1, 1994
Summary
Forceful blinking significantly increases tear film lipid layer thickness (LLT). This effect is more pronounced in individuals with thicker baseline LLT, suggesting blinking aids lipid layer maintenance via meibomian gland expression.
Area of Science:
- Ophthalmology
- Biomedical Optics
- Tear Film Dynamics
Background:
- The tear film's lipid layer is crucial for ocular surface health.
- Blinking is a fundamental mechanism for tear film distribution and maintenance.
- Understanding how blinking affects the lipid layer is important for diagnosing and managing dry eye disease.
Purpose of the Study:
- To investigate the alterations in tear film lipid layer thickness (LLT) in response to different blinking patterns.
- To quantify the impact of forceful blinking on LLT.
- To explore the relationship between baseline LLT and the response to forceful blinking.
Main Methods:
- A custom-designed specular reflection monitoring system was employed.
- Tear film lipid layer thickness (LLT) was measured in 104 subjects.
- LLT was quantitated under normal (baseline) and forceful blinking conditions using interference colors.
Main Results:
- Forceful blinking significantly increased the tear film lipid layer thickness (LLT).
- The magnitude of LLT increase was correlated with baseline LLT values.
- Individuals with baseline LLT of 75-150 nm showed a mean increase of 33 nm, while those with LLT < or = 60 nm showed a mean increase of 19 nm (p = 0.0001).
Conclusions:
- Blinking plays a significant role in increasing tear film lipid layer thickness.
- The blinking mechanism may be vital for maintaining the lipid layer by stimulating lipid expression from meibomian glands.
- These findings highlight the importance of blinking dynamics in ocular surface homeostasis.