[mass noun] Drooping of the upper eyelid due to paralysis or disease, or as a congenital condition.
- ‘Symptoms include nasal congestion, ptosis of one eyelid, miosis, and conjunctional hyperemia.’
- ‘On physical examination, slight proptosis of the left eye and ptosis of the left upper eyelid were noted.’
- ‘Symptoms range from isolated ptosis, diplopia or mild proximal muscle weakness to severe generalized weakness.’
- ‘The first sign frequently presents as ocular muscle weakness resulting in diploplia (double vision) and/or ptosis (drooping eyelid).’
- ‘Problems from inexpert use are droopy eyelid - a condition called ptosis - or a near-frozen forehead, a lop-sided mouth or drooling.’
Mid 18th century: from Greek ptōsis, from piptein to fall.