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 ?
In the current study, we noted a significant difference between tear measurements when the PRTT thread was placed under the upper eyelid margin and in the lower conjunctival fornix.
Hughes flaps, also called tarsoconjunctival bridge flaps, advance the tarsal plate and conjunctiva from the ipsilateral upper eyelid to repair the defect in the lower eyelid (10,11).
the distance from the upper eyelid margin to corneal light reflex in primary gaze (MRD1) (normal: 4 to 5 mm);
Reid was caught by an accidental clash of heads that split his left upper eyelid open from rim to rim and there was even a squabble as two rival cuts men sought to come to his aid.
Symptoms of the disease include lethargy, depression, swelling in the lower legs, conjunctivitis and swelling around the eye socket and upper eyelid.
Its sole function is to raise the upper eyelid - without it, we would all have the drooping eyes of a bloodhound.
The treatment's long-term effects remain unknown and require further study However, Duvoisin says, since the immediate and localized side effects of Type A toxin (such as drooping of the upper eyelid or difficulty in swallowing) are transitory, treatable and rarely serious when the toxin is properly administered, botulinum therapy appears safe and "relatively easy"
Written by The Morrow Institute's Sheila Barbarino, MD, FAAO, the article entitled, "Stab Incision for Upper Eyelid Medial Fat Removal," explains how the surgeons quickly and easily remove the age-related fat pad located at the inner corner of the eye.
Since appearing in the series Christopher has had three hair transplants, had his nose reshaped twice, undergone an upper eyelid lift and had teeth veneers, fillers and Botox.
Ptosis, also known as eyelid drooping, is a condition where falling of the upper eyelid occurs due to weakness of the eyelid muscle.
Pull the lower eyelid down with the middle finger of your dominant hand and lift the upper eyelid with your other hand.
Maki developed a mathematical model to simulate the direction tear film travels when entering the eye from the lacrimal glands above the upper eyelid.

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