Ptosis

• Ptosis (pronounced toe’ sis) is a drooping of the upper eyelid,
• It 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.
• An ophthalmologist that specialises in oculoplastic surgery is best placed to perform the corrective surgery

Link: www.geteyesmart.org/eyesmart/diseases/ptosis.cfm