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The upper eyelid crease is a common variation between people of White and East Asian ethnicities. [9] Westerners commonly perceive the East Asian upper eyelid as a "single eyelid". [9] However, East Asian eyelids are divided into three types – single, low, and double – based on the presence or position of the lid crease. [10]
An epicanthic fold or epicanthus [6] is a skin fold of the upper eyelid that covers the inner corner (medial canthus) of the eye. [3] However, variation occurs in the nature of this feature and the possession of "partial epicanthic folds" or "slight epicanthic folds" is noted in the relevant literature.
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Ptosis, also known as blepharoptosis, [1] is a drooping or falling of the upper eyelid.This condition is sometimes called "lazy eye", but that term normally refers to the condition amblyopia.
Blepharochalasis – An immune-mediated inflammation of the eyelid that is characterized by exacerbations and remissions of eyelid edema which results in a stretching and subsequent atrophy of the eyelid tissue, leading to the formation of redundant folds over the lid margins. It typically affects only the upper eyelids, and may be unilateral ...
The upper or lower eyelid can be involved, and one or both eyes may be affected. When entropion occurs in both eyes, this is known as "bilateral entropion". Repeated cases of trachoma infection may cause scarring of the inner eyelid, which may cause entropion. [3] In human cases, this condition is most common to people over 60 years of age. [4]
Blepharochalasis is an inflammation of the eyelid that is characterized by exacerbations and remissions of eyelid edema, which results in a stretching and subsequent atrophy of the eyelid tissue, leading to the formation of redundant folds over the lid margins. It typically affects only the upper eyelids, and may be unilateral as well as ...
Blepharitis is the irritation of the lid margin, where eyelashes join the eyelid. The eyelids are red and itching, the skin often becomes flaky, and the eyelashes may fall out. Distichiasis is the abnormal growth of lashes from certain areas of the eyelid. Trichiasis refers to ingrown eyelashes. Eyelashes may become infested with parasitic crab ...