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Eyelids
The eyelids protect the eyes from the environment, injury and light. They also maintain a smooth cornea surface by spreading tears evenly over the eye. The lids are composed of an outer layer of skin, a middle layer of muscle and tissue that gives them form, and an inner layer of moist conjunctival tissue.
Several muscles work together to control the actions of the lids. Located in the middle layer of the eyelid is the orbicularis oculi, a circular muscle that closes the lids. The levator muscle is attached inside the upper lid and elevates it. A smooth muscle called Mueller's gives the lids tone and helps maintain elasticity.
Tiny oil-producing meibomian glands line the inner edge of the lids. These glands produce oil that lubricates the eye. Rows of lashes protect the eyes from the elements and debris.
Not only do the eyelids provide protection and moisture, they display expression and emotions that are an important part of our individuality.
St. Luke's Cataract & Laser
Institute provides this on-line information for educational and
communication purposes only and it should not be construed as
personal medical advice. Information published on this St.
Luke's website is not intended to replace, supplant, or augment a
consultation with an eye care professional regarding the
viewer/user's own medical care. St. Luke's disclaims any and
all liability for injury or other damages that could result from use
of the information obtained from this site.