title: [Upper and lower eyelid position in different degrees of downgaze and upgaze].
abstract: OBJECTIVE
  To quantify the relation between eye and eyelids placement in different positions during downgaze and upgaze in healthy subjects.
  
  
  METHODS
  The position of the eye and eyelids of 10 healthy individuals was quantified by palpebral fissure image processing with NIH Image software. Upper and lower mid-pupil margin distance was measured in 7 positions: -30, -20, -10, 0, +10, +20 and +30 degrees (positive signs correspond to upgaze and negative signs to downgaze) along vertical meridian.
  
  
  RESULTS
  The upper mid-pupil margin distance decreases in upgaze and even more in downgaze. The lower mid-pupil margin distance increases in upgaze and decreases in downgaze. About the palpebral fissure height, it gets larger in upgaze until 20 degrees and smaller in downgaze.
  
  
  CONCLUSIONS
  Our data showed that the interpalpebral fissure height varies with vertical meridian gaze amplitude and that considerations about mid-pupil margin distance must consider the amount of upgaze or downgaze.
authors.affiliation: Departamento de Oftalmologia, Otorrinolaringologia e Cirurgia de Cabeça e Pescoço, Faculdade de Medicina de Ribeirão Preto, USP, Ribeirão Preto, SP, Brasil.
authors.forename: Dante Augusto
authors.initials: DA
authors.lastname: Mastropietro
authors.forename: Luciano Ambrósio
authors.initials: LA
authors.lastname: Alves
authors.forename: Antônio Augusto
authors.initials: AA
authors.lastname: Velasco e Cruz
mesh_terms: D000293:Adolescent; D000328:Adult; D005133:Eye Movements / Q000502:physiology*; D005143:Eyelids / Q000033:anatomy & histology / Q000502:physiology*; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D008297:Male; D011680:Pupil / Q000502:physiology; D055815:Young Adult