Tear (Tears in the Eyes)

Tear (Tears in the Eyes)


Tears are a clear liquid produced by the lacrimal glands located above each eye. They play a vital role in eye health, vision, and comfort.


🔹 Functions of Tears:


1. Lubrication – Keeps the eye surface moist and prevents dryness.


2. Protection – Washes away dust, foreign particles, and microorganisms.


3. Nourishment – Provides oxygen and nutrients to the cornea.


4. Emotional Expression – Produced during crying due to strong emotions (sadness, happiness, stress).


5. Antibacterial Action – Contains enzymes like lysozyme that help fight infections.


🔹 Types of Tears:


1. Basal Tears


  • Constantly produced to lubricate and nourish the eye.


2. Reflex Tears


  • Produced in response to irritants like smoke, wind, or onion fumes.


3. Emotional Tears


  • Triggered by emotional stress, joy, or sadness.



🔹 Tear Film Layers:


1. Lipid Layer (outer) – Prevents evaporation.


2. Aqueous Layer (middle) – Provides nutrients and hydration.


3. Mucin Layer (inner) – Helps tears stick to the eye surface.


🔹 Tear Disorders:


Dry Eye Syndrome – Reduced tear production or poor-quality tears.


Excess Tearing (Epiphora) – Can be due to blocked tear ducts or eye irritation.


Blepharitis – Inflammation affecting tear film stability.


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