Ptosis

Ptosis is the medical term for the inability to elevate the upper eyelid. It occurs when there is a dysfunction of the levator muscle due to a nerve or muscle problem. The most common form is the degenerative type, where the levator muscle is stretched or torn. Severe ptosis can reduce your vision. Causes may be congenital, degenerative (age-related), or induced by thyroid disorders, myasthenia gravis, etc. Congenital and age-related ptosis can be corrected by shortening the levator aponeurosis with surgery.