title: Dryness and discomfort with silicone hydrogel contact lenses.
abstract: OBJECTIVE
  The purpose of this study was to determine whether symptoms of dryness and discomfort are experienced differently with silicone hydrogel lenses compared to conventional hydrogels, in symptomatic and asymptomatic subjects.
  
  
  METHODS
  Thirty-nine symptomatic and asymptomatic subjects wore four types of lenses: Focus NIGHT & DAY (CIBA Vision), Focus DAILIES (CIBA Vision), ACUVUE 2 (Johnson & Johnson Visioncare) and Proclear Compatibles (CooperVision) contralaterally for 7 hours and rated comfort and dryness on a zero-to-100 point visual analog scale at 0, 1, 3, 5 and 7 hours.
  
  
  RESULTS
  In both groups, no lens differences were found for comfort and dryness, but the comfort and dryness ratings of the symptomatic group decreased significantly (became worse) over the 7-hour period.
  
  
  CONCLUSIONS
  These results demonstrate that dryness and comfort is the same over time with silicone hydrogel as with the other three lenses.
authors.affiliation: Centre for Contact lens Research, School of Optometry, University of Waterloo, Waterloo, Ontario, Canada. dfonn@sciborg.uwaterloo.ca
authors.forename: Desmond
authors.initials: D
authors.lastname: Fonn
authors.forename: Kathryn
authors.initials: K
authors.lastname: Dumbleton
mesh_terms: D000328:Adult; D001672:Biocompatible Materials / Q000009:adverse effects*; D003263:Contact Lenses, Hydrophilic / Q000009:adverse effects*; D004311:Double-Blind Method; D015352:Dry Eye Syndromes / Q000209:etiology* / Q000503:physiopathology; D005260:Female; D006305:Health Status Indicators; D006801:Humans; D008297:Male; D017060:Patient Satisfaction; D012826:Silicone Elastomers / Q000009:adverse effects*; D013997:Time Factors
chemical_list: D001672:Biocompatible Materials; D012826:Silicone Elastomers