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A pair of movable folds of skin which act as protective coverings of the eye. The upper eyelid extends downward from the eyebrow and is the more moveable of the two. When the eye is open and looking straight ahead, it just covers the upper part of the cornea; when it is closed, it covers the whole cornea. The lower eyelid reaches just below the cornea when the eye is open and rises only slightly when it shuts. Each eyelid consists of the following layers, starting anteriorly: (1) skin, (2) a layer of subcutaneous connective tissue, (3) a layer of striated muscle fibres of the orbicularis muscle, (4) a layer of submuscular connective tissue, (5) a fibrous layer, including the tarsal plates, (6) a layer of smooth muscle, (7) the palpebral conjunctiva. Syn. blephara; lids; palpebrae. See ablephary; blepharitis; ciliosis; ectropion; entropion; epicanthus; lid eversion; eyelid lamella; lagophthalmos; palpebral ligament; myokymia; orbital septum; phthiriasis; Cogan's lid twitch sign; Collier's sign; Dalrymple's sign; inferior palpebral sulcus; superior palpebral sulcus; tarsorrhaphy; tarsus; xanthelasma.
eyelids lamella The eyelid is sometimes conceptualized as consisting of an anterior and a posterior lamella. The anterior lamella consists of the skin, the layer of subcutaneous connective tissue and the layer of striated muscle fibres of the orbicularis muscle. The posterior lamella consists of the tarsal plates, a layer of smooth muscle (Müller's palpebral muscle), and the palpebral conjunctiva.
eyelids retractor muscles The eyelid muscles that open the palpebral aperture. The upper eyelid is elevated by the levator palpebrae superioris muscle and the superior tarsal muscle (of Müller) and the lower eyelid is depressed by the inferior tarsal muscle (of Müller).
Millodot: Dictionary of Optometry and Visual Science, 7th edition. © 2009 Butterworth-Heinemann

Patient discussion about eyelids

Q. eyelids what causes your eye lids too twitch? my left eye lid has been twitching on and off for about a week what causes it and how can i get it to stop.

A. Not an answer, just another question - how long can this go on? My eyelid has been twitching, (likely lack of sleep) for almost a month now. Any treatment that I should seek?

More discussions about eyelids
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References in periodicals archive ?
Managing director of Ocusoft, Trevor McCormack, said: "This next-generation combination therapy is fast-acting against microorganisms and expedites healing of the eyelids while addressing inflammation and long-term eyelid hygiene."
And there was 21% lower coverage of the area around the eyelids with moisturiser and 14% with sunscreen.
Eyelid surgery, or blepharoplasty, removes that excess skin and fat (and sometimes muscle) to lift the eyelids.
Mix water with mild soap (a tear-free baby shampoo is a good idea) and then use a cotton swab or washcloth to wipe off your eyelids with the mixture.
To the Editor: Blepharoptosis is a disease commonly seen in the Asian population, defined as an abnormal lower upper eyelid margin that is <2.0 mm above the midpoint of the pupil when a person looks straightforward.
Bouchard said, 'Lax, rubbery eyelids are found in people who have one of three related conditions: lax eyelid condition (rubbery lids); lax eyelid syndrome (lax eyelids plus conjunctivitis); and floppy eyelid syndrome (lax eyelid syndrome in obese young men).
Eyelid tumours are by far the most common neoplasms encountered in ophthalmic clinical practice and are estimated to represent more than 90% of all ophthalmic tumours.
Heindl, "Eyelids," in Applied pathology of ophthalmic microsurgeon, G.
The inferior meatus was packed with 4% lidocaine with 1 : 1,000 epinephrine, and the medial part of the lower and upper eyelids was infiltrated with 2% lidocaine with 1: 100,000 epinephrine.
It can cause blurred vision, sore eyelids and sticky eyes.
Oust Demodex Cleanser (available in both pre-moistened pads and a foaming eyelid cleanser) is an extra-strength cleanser with tea tree oil that effectively relieves irritation by removing oil, debris, pollen and other contaminants from eyelashes, eyelids and the face, as well as aiding in the removal of adult demodex mites and their offspring when used daily.
Summary: Patient's eyelids were removed to prevent the spread of multiple tumours