The |eye| lids are two folds of skin that shield the eyeball. The upper lid is larger and more movable. It regulates the opening and closing of the |eye| with the help of the |orbicularis palprebrarum| muscle. Lower-lid movement is slight. The |eye| lids sweep dirt from the surface of the |eye|, protect it from injury, and help distribute the tear fluid. When the |eye| is closed, the lids unite at the lid-slit in a downward curve. The corners of the |eye| are called the inner canthus, which is near the opening of the lachrymal duct, and the outer canthus, which ends in the crease where the upper lid overlaps the lower lid. The |eye| lid is lined with a mucous membrane called the conjunctiva. This lining also covers the front of the eyeball. This covering, when washed with tears, gives the |eye| its glossy appearance.
