title: [Blepharoptosis in contact lens wearers].
abstract: OBJECTIVE
  To investigate the occurrence of acquired blepharoptosis in contact lens wearers.
  
  
  METHODS
  Prospective analysis of 50 contact lens wearers being followed at the Contact Lenses Section of the Ophthalmology Service at the "Complexo Hospitalar Santa Casa de Porto Alegre" between April and November 2004. The margin reflex distance (MRD) was evaluated for the 99 eyelids of contact lens wearers and for the 52 eyelids of controls. A patient whose measurement was less than 2 mm or with an assymetry of margin reflex distance greater or equal to 2 mm were considered with blepharoptosis. The contact lens type and duration of contact lenses wear were evaluated.
  
  
  RESULTS
  Five patients presented ptosis, all of them were hard contact lens wearers, one had bilateral and four had unilateral ptosis. The study shows that the contact lens wearers had the margin reflex distance 0.88 mm smaller than the non-wearers. The margin reflex distance values decreased progressively in the studied groups: controls, gelatinous contact lens wearers and rigid contact lens wearers.
  
  
  CONCLUSIONS
  The study suggests that contact lens wearers have alterations in the margin reflex distance values, especially the rigid contact lens wearers.
authors.affiliation: Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, São Paulo, SP, Brasil.
authors.forename: Tiana Gabriela
authors.initials: TG
authors.lastname: Burmann
authors.forename: Fabiana Borba
authors.initials: FB
authors.lastname: Valiatti
authors.forename: Luciane
authors.initials: L
authors.lastname: Obalski
authors.forename: Italo
authors.initials: I
authors.lastname: Marcon
mesh_terms: D000293:Adolescent; D000328:Adult; D001763:Blepharoptosis / Q000175:diagnosis / Q000453:epidemiology / Q000209:etiology*; D016022:Case-Control Studies; D003261:Contact Lenses / Q000009:adverse effects* / Q000706:statistics & numerical data; D003263:Contact Lenses, Hydrophilic / Q000009:adverse effects; D005139:Eyeglasses; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged