5Berke RN, Wadsworth JA. Histology of levator muscle in congenital and acquired ptosis. Arch Ophthalmol 1955 ,53(3 ) :413-428.
6Isaksson I, Mellgren J. Pathological- anatomical ehoges in the levator palpebrac supefiofis muscle in congenital blepharoptosis. Acta Pathol Microbiol Scand Suppl 1961 ,51 (144) :157-160.
7Isaksson I. Studies oil congenital genuine blepharoptosis. Morphological and functional investigations of the upper eyelid. Acta Ophthalmol Suppl 1962 ,72 : 1-121.
8Kuwabara T, Cogan DG, Johnson CC. Structure tithe muscles of the upper eyelid. Arch Ophthalmol 1975 ,93 ( 11 ) : 1189-1197.
9Sutuh FC. Histological changes in congenital and acquired blepharoptesis. Eye 1988 ,2(2) : 179-184.
10Clark BJ, Kemp EG, Behan WM, et al. Abnormal extracellular material in the levator palpebrae superiofis complex in congenital ptosis. Arch Ophthalmol 1995 , 113 ( 11 ) : 1414-1419.
