A drooping eyelid is called ptosis or blepharoptosis. In ptosis, the upper eyelid falls to a position that is lower than normal. Severe ptosis may cover part or all of the pupil and interfere with vision, resulting in amblyopia. [1, 2] Note the images below:
Ptosis can affect one eye or both eyes and can present at birth or be more apparent later in childhood. Ptosis that is present at birth or within the first year of life is called congenital ptosis. Most cases of congenital ptosis are isolated and do not affect vision, but refractive errors and amblyopia should always be excluded. Any ptosis that develops over a period of days or weeks can signal a serious medical problem and needs further neurologic and physical evaluation.
The eyelids are elevated by the contraction of the levator palpebrae superioris.
In most cases of congenital ptosis, a droopy eyelid results from a localized myogenic dysgenesis. Rather than normal muscle fibers, fibrous and adipose tissues are present in the muscle belly, diminishing the ability of the levator to contract and relax. Therefore, the condition is commonly called congenital myogenic ptosis.
Congenital ptosis can also occur when the innervation to the levator is interrupted through neurologic or neuromuscular junction dysfunction. Some forms of congenital ptosis may represent a form of congenital cranial dysinnervation disorder. 
The frequency of congenital ptosis in the United States has not been officially reported. However, in approximately 70% of known cases, congenital ptosis affects only one eye.
The incidence rate of congenital ptosis worldwide is unknown.
If congenital ptosis obscures any part of the pediatric patient's visual field, surgery must be performed to correct the problem early in life. Otherwise, a permanent loss of vision may occur as a result of amblyopia. Note the following:
Congenital ptosis occurs equally among the different races.
Congenital ptosis occurs equally between males and females.
Congenital ptosis is usually present at birth but may manifest within the first year of life.
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