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Tear: important in eye protection
What is tear
A tear is a fluid produced by lacrimal glands found inside each eye. It has the function of lubricating the eyes and protecting them against foreign substances and infections.
To protect the eyes from infection, tears contain salt and an enzyme (lysozyme) that fights pathogenic microorganisms such as bacteria.
Another function of tears is to constantly clean the inside of the eyes and the inner part of the eyelids, in the so-called tear lake, where they drain through the small tear ducts that converge in the tear sac, from there the tears pass through the nasolacrimal duct until they reach the nasal passages.
When the flow of tears is abundant, excess fluid that cannot be collected by the tear ducts overflows the eyelids and carries with it foreign bodies that cannot pass through the tear ducts.