Muscular – In some people ptosis is actually caused by a weak levator muscle. The function of the levator muscle is to raise the eyelid. Muscular ptosis can occur in early childhood or adulthood.
Ptosis which occurs in early childhood is usually due to a weak levator muscle. If the ptosis affects the child’s vision, early correction is necessary. In some cases the ptosis will actually keep a child from walking well because the child must lift the chin in order to see. If the ptosis is not that severe, ptosis repair is usually delayed until the child is more cooperative, between 4 and 6 years of age. Mild ptosis in childhood can worsen as the person ages, requiring surgical repair in young adulthood.
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Involutional ptosis is corrected by tightening the levator muscle. The function of the levator muscle is to raise the eyelid. Ptosis repair is performed through an incision in the normal crease in the upper lid.
Muscular ptosis can also be acquired later in life as the muscle weakens. In some cases, muscular ptosis is associated with other muscular or neurologic problems.