This is secreted by the lacrimal glands and consists of proteins, electrolytes and water.
(1)Functions:
To supply atmospheric oxygen to the avascular corneal epithelium.
Antibacterial function due to presence of IgA, lysozyme and lactoferrin.
To abolish any minute irregularities of the anterior corneal surface.
To wash away debris and noxious stimuli and allow the passage of luecocytes after injury.
(2) Deficiency of this layer results in a hyposecretive dry eye.
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