title: [Precise determine the position of the opposite upper lid after correcting the congenital unilateral ptosis and their relationship].
abstract: OBJECTIVE
  The good results should be obtained after correction of the congenital unilateral ptosis for bilateral eyes.
  
  
  METHODS
  A formula was made and determined the position of the opposite upper lid according to Hering's law.
  
  
  RESULTS
  Thirty-two patients with congenital unilateral ptosis were operated. The correct rate is 94.12% according to the formula and the control is 66.67%.
  
  
  CONCLUSIONS
  The position of the opposite upper lid should be determined after the ptosis eye corrected before operation in order to obtain a good results.
authors.affiliation: Plastic Surgery Hospital, Hangzhou 310014, China.
authors.forename: H
authors.initials: H
authors.lastname: Sun
authors.forename: J
authors.initials: J
authors.lastname: Song
authors.forename: J
authors.initials: J
authors.lastname: Yao
mesh_terms: D000293:Adolescent; D000328:Adult; D000886:Anthropometry; D019882:Blepharoplasty / Q000379:methods; D001763:Blepharoptosis / Q000151:congenital* / Q000601:surgery*; D002648:Child; D005143:Eyelids / Q000033:anatomy & histology*; D005260:Female; D006801:Humans; D008297:Male; D008433:Mathematics