title: Clinical performance of different care systems with silicone hydrogel contact lenses.
abstract: OBJECTIVE
  To assess the clinical and subjective performance of a one-step hydrogen peroxide (H2O2) lens care system compared to a multi-purpose disinfecting system (MPDS) when used with silicone hydrogel (SiH) lenses.
  
  
  METHODS
  This was an eight-week, contralateral (lens type) clinical trial with a randomized, cross-over (care system) design. The H2O2 system was Clear Care ((AO Sept Plus) CIBA VISION) and the MPDS was OPTI-FREE RepleniSH (Alcon) and the SiH materials were lotrafilcon B (Air Optix; CIBA VISION) and senofilcon A (Acuvue OASYS, Johnson & Johnson Vision Care). Investigators and subjects were masked to lens care and lens type, respectively. Clinical variables and ocular health assessments were conducted at a baseline, two-week and four-week visit for each cross-over phase. Comfort, dryness and vision were rated on 0-100 scales. Wearing times and comfortable wearing times were also recorded.
  
  
  RESULTS
  Twenty-six subjects were enrolled: nine male, 17 female, mean age (+/-standard deviation) 31+/-12 years (range 17-59 years) and 24 subjects completed the study. Clinical variables showed no difference between solutions (all p > 0.05), however one subject exhibited solution-induced corneal staining with both lens materials and the MPDS. There was no difference between solutions in subjective overall ratings of comfort, dryness or vision (p > 0.05). The H2O2 resulted in longer reported comfortable wearing times than the MPDS (10.93 +/- 1.71 vs 9.84 +/- 1.47 h; repeated measures ANOVA, p < 0.01).
  
  
  CONCLUSIONS
  While both lens care systems performed well with the SiH lenses used, the H2O2 resulted in a longer reported comfortable wearing time then the MPDS.
authors.affiliation: Centre for Contact Lens Research, School of Optometry, University of Waterloo, 200 University Ave. West, Waterloo, ON N2L3G1, Canada. njmacdou@uwaterloo.ca
authors.forename: Nancy
authors.initials: N
authors.lastname: Keir
authors.forename: Craig A
authors.initials: CA
authors.lastname: Woods
authors.forename: Kathryn
authors.initials: K
authors.lastname: Dumbleton
authors.forename: Lyndon
authors.initials: L
authors.lastname: Jones
mesh_terms: D000293:Adolescent; D000328:Adult; D000891:Anti-Infective Agents, Local / Q000494:pharmacology; D018639:Contact Lens Solutions / Q000494:pharmacology*; D003262:Contact Lenses, Extended-Wear; D018592:Cross-Over Studies; D015352:Dry Eye Syndromes / Q000517:prevention & control; D004866:Equipment Contamination / Q000517:prevention & control*; D005260:Female; D006801:Humans; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D006861:Hydrogen Peroxide / Q000494:pharmacology*; D008297:Male; D008875:Middle Aged; D012826:Silicone Elastomers; D055815:Young Adult
chemical_list: D000891:Anti-Infective Agents, Local; D018639:Contact Lens Solutions; D012826:Silicone Elastomers; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate; D006861:Hydrogen Peroxide