Ptosis is a condition where there is dropping or  falling on an eyelid, also called as lazy eye. Simple ptosis Ptosis associated with deformities of lids and blepharophimosis Ptosis associated with varying degrees of external ophthalmoplegia Ptosis associated with synkinetic movements of jaw and synkinetic ptosis sympathetic Ptosis associated with cong sympathetic palsy periodic Ptosis associated with cyclic oculomotor syndrome intermittent pseudo Ptosis associated with dunes retraction syndrome