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The top part but below anterior. It keeps cell membranes moist, preventing breakdown of epithelial cells by lubricating the eyelids during blinking. It is the first line of defense against microbial infection, containing antibacterial substances and antibodies that protect the corneal surface.

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1. The top part but below anterior. It keeps cell membranes moist, preventing breakdown of epithelial cells by lubricating the eyelids during blinking. It is the first line of defense against microbial infection, containing antibacterial substances and antibodies that protect the corneal surface.
Image: Precorneal tear film





 
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