
The cavity, located between the eye and the eyelid, is called the conjunctival sac. The surface of the conjunctival sac is covered with a smooth shell of a gently pink color. In the outer and inner corners of the conjunctiva is loose and red, since there are many vessels in it. Conjunctival bag is necessary for secretion of tears and moistening of the eye, removing particles of dust and villi along with mucous fluid.
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