An eyelid is a thin fold of skin that covers and protects the human eye. The levator palpebrae superioris muscle retracts the eyelid, exposing the cornea to the outside, giving eyelid allergy. This can be either voluntarily or involuntarily. The human eyelid features a row of eyelashes along the eyelid margin, which serve to heighten the protection of the eye from dust and foreign debris, as well as from perspiration. Its key function is to regularly spread the tears and other secretions on the eye surface to keep it moist, eyelid allergy, since the cornea must be continuously moist.
They keep the eyes from drying out when asleep. Moreover, the blink reflex protects the eye from foreign bodies, eyelid allergy. The eyelid is made up of several layers; from superficial to deep, these are: The meibomian glands lie within the eyelid and secrete the lipid part of the tear film, eyelid allergy.
The skin eyelid allergy similar to areas elsewhere, but is relatively thin  and has more pigment cells. In diseased persons these may wander and eyelid allergy a discoloration of the lids. It contains eyelid allergy glands and hairs, the latter becoming eyelashes as the border of the eyelid is met. In humans, the sensory nerve supply to the upper eyelids is from the infratrochlearsupratrochlearsupraorbital and the lacrimal nerves from the ophthalmic branch V1 of the trigeminal nerve CN V.
The skin of the lower eyelid is supplied by branches of the infratrochlear at the medial angle, the rest is supplied by branches of the infraorbital nerve of the maxillary branch V2 of the trigeminal nerve. In humans, the eyelids are supplied with blood by two arches on each upper and lower lid. The arches are formed by anastomoses of the lateral palpebral arteries and medial palpebral arterieseyelid allergy off from the lacrimal artery and ophthalmic arteryrespectively.
The human eyelid features a row of eyelashes along the eyelid margin, which serve to heighten the protection of the eye from dust and foreign debris. Any condition that affects the eyelid is called eyelid disorder. The most common eyelid disorders, their causes, eyelid allergy, symptoms and treatments are the following:. Most of the cosmetic eyelid surgeries are aimed to enhance the look of the face and to boost self-confidence by restoring a youthful eyelid appearance.
Eyelid allergy are latex allergy precautions in surgery to remove fat and excess skin that may be found on the eyelids after a certain age. Eyelid surgeries are also performed to improve peripheral vision or to treat chalazioneyelid allergy, eyelid tumors, ptosisextropiontrichiasisand other eyelid-related conditions. Eyelid surgeries are overall safe procedures but they carry certain risks since the area on which the operation is performed is so close to the eye, eyelid allergy.
Blepharoplasty is a cosmetic surgical procedure performed to correct deformities and improve or modify the appearance of the eyelids. The procedure is particularly popular in East Asia, where it has been reported to be the most common aesthetic procedure in Taiwan and South Korea.
The use of double sided tape to create the illusion of creased, or "double" eyelids has become a prominent practice in China eyelid allergy other Asian countries. There is a social pressure for women to have this surgery, and also to use the alternative taping practices, eyelid allergy.
After deathit is common in many cultures to pull the eyelids of the deceased down to close the eyes. This is a typical part of the last offices. From Eyelid allergy, the free encyclopedia, eyelid allergy. For the South Korean film, see Eyelids film. For the levator palpebrae, see levator palpebrae superioris muscle.
The orbit of the eye. Superior rectus muscle Inferior rectus muscle Lateral rectus muscle Medial rectus muscle Superior oblique muscle Trochlea of superior oblique Inferior oblique muscle. Retrieved from " https: Human eye eyelid allergy Human anatomy.
Upper and lower eyelids, eyelid allergy. Anatomical terminology [ edit on Wikidata ], eyelid allergy.