Ptosis (pronounced toe’ sis), or drooping of the upper eyelid, may occur for several reasons such as: disease, injury, birth defect, previous eye surgery and age.
In most cases, it is caused by either a weakness of the levator muscle (muscle that raises the lid), or a problem with the nerve that sends messages to the muscle.
Children born with ptosis may require surgical correction of the lid if it covers the pupil. In some cases, it may be associated with a crossed or misaligned eye (strabismus).
Left untreated, ptosis may prevent vision from developing properly, resulting in amblyopia, or lazy eye.
Patients with ptosis often have difficult blinking, which may lead to irritation, infection and eyestrain.
If a sudden and obvious lid droop is developed, an eye care practitioner should be consulted immediately.