Have you ever wondered what keeps dirt and other impurities out of our eyes?
Nature has designed a layer called the tear film that acts as our eyes’ first line of defense against the environment. There are actually three layers in the tear film.
The oil layer. This is the outermost layer of the tear film. Glands in our eyes, called the Meibomian glands, secrete oily substances that help coat the layer. Oil and water don’t mix well, hence this layer helps to keep the tears from spilling out of the eye and prevent loss of moisture from the eyes.
The aqueous layer. This is the watery layer, containing water mixed with proteins to form what we know as tears.
The mucous layer. This is the slippery layer, containing viscous substances that help the tear film adhere to the eye.
When eyes dry up
Diese Geschichte stammt aus der December 2017-Ausgabe von Health Today Malaysia.
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Diese Geschichte stammt aus der December 2017-Ausgabe von Health Today Malaysia.
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