eyelid

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eyelid

 [i´lid]
either of two movable folds (upper and lower) protecting the anterior surface of the eyeball.

eye·lid

(ī'lid), [TA]
One of two movable folds that cover the front of the eyeball when closed; formed of a fibrous core (tarsal plate) and the palpebral portions of the orbicularis oculi muscle covered with skin on the superficial, anterior surface and lined with conjunctiva on the deep, posterior surface; rapid contraction of the contained muscle fibers produces blinking; each has fixed (orbital) and free margins, the latter separated centrally by the palpebral fissure, united at the lateral and medial palpebral commissures, and bearing eyelashes, openings of tarsal and ciliary glands and (medially) the lacrimal puncta.
Synonym(s): palpebra [TA], blepharon, lid

eyelid

/eye·lid/ (-lid) either of two movable folds (upper and lower) protecting the anterior surface of the eyeball.

eyelid

(ī′lĭd′)
n.
Either of two folds of skin and muscle that can be closed over the exposed portion of the eyeball.

eyelid

Etymology: AS, eage + hlid
one of two movable folds of protective thin skin over the eye, with eyelashes and ciliary and meibomian glands along its margin. It consists of loose connective tissue containing a thin plate of fibrous tissue lined with mucous membrane (conjunctiva). The orbicularis oculi muscle and the oculomotor nerve control the opening and closing of the eyelid. The upper and lower eyelids are separated by the palpebral fissure. Also called palpebra [pal′-pəbrə] .

eye·lid

(ī'lid) [TA]
One of the two movable folds covering the front of the eyeball when closed; formed of a fibrous core (tarsal plate) and the palpebral portions of the orbicularis oculi muscle covered with skin on the superficial, anterior surface and lined with conjunctiva on the deep, posterior surface; rapid contraction of the contained muscle fibers produces blinking; they each have fixed (orbital) and free margins, the latter separated centrally by the palpebral fissure, united at the lateral and medial palpebral commissures, and bearing eyelashes, the openings of tarsal and ciliary glands and (medially) the lacrimal puncta.
Synonym(s): palpebra [TA] , blepharon, lid.

eyelid

either of two movable cutaneous folds (upper and lower) protecting the anterior surface of the eyeball. Most mammals and birds have a third eyelid that moves across the eye from the medial canthus.

eyelid abnormality
includes entropion, ectropion, ptosis.
eyelid coloboma
a congenital, full thickness defect of varying degrees in an eyelid margin.
eyelid drooping
see ptosis.
eyelid eversion
eyelid inflammation
eyelid inversion
premature opening eyelid
opening of eyelids in puppies and kittens before the normal age of 7 to 10 days may result in exposure keratitis because of inadequate production of tears.
eyelid snapping
winking.
eyelid speculum
an instrument used to keep the eyelids apart.
third eyelid
see membrana nictitans.

Patient discussion about eyelid

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 eyelid
References in periodicals archive ?
HA injections in the lower eyelid correct two important components in retracted lower eyelids.
The use of porous polyethylene (Medpor) lower eyelid spacers in lid heightening and stabilisation.
sup][4] Briefly, a flap is created to connect the lateral upper eyelid posterior lamella fornix tissue to the lower eyelid margin.
The mean [+ or -] SD PRTT values for the lower eyelid of OS and OD were 19.
The mass on the right lower eyelid was located 2 mm medial to lateral outer canthus.
A 71-year-old man presented with a nodular lesion on his left lower eyelid.
Even so, a considerable residual lagophthalmos and lower eyelid retraction remained (Figure 1).
On December 7, an opthalmologist examined Cohen's eye and found two sutures in her eyelid that had scratched her cornea and lacerated her lower eyelid.
Mohs surgery is the optimal technique to remove basal and squamous cell carcinomas from the lower eyelid and other anatomical structures where unnecessary resection would cause further disfigurement.
Most often, BCCs were located on the lower eyelid (246, or 57%).

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