title: Gas permeable and soft contact lens wear in children.
abstract: OBJECTIVE
  To compare children's reports of comfort, vision, and contact lens-related issues in gas permeable (GP) and soft (SCL) contact lens wearers.
  
  
  METHODS
  Subjects were 116 8- to 11-year old children in the Contact Lenses and Myopia Progression Study. Aspects of contact lens wear were compared for children remaining in their original treatment group (either GPs or SCLs) for 3 years. Questionnaires were completed at every visit, as was visual acuity. Comparisons were made between the two groups using logistic regression or mixed linear models analyses as appropriate to examine the contact lens wearing experience. Additionally, children crossing over from GP wear to SCLs were compared with children remaining in GP lenses to determine the potential factors related to GP dissatisfaction.
  
  
  RESULTS
  Seventy percent of GP wearers and 93% of SCL wearers wore their assigned lenses every visit. GP wearers wore their lenses significantly fewer hours per week than the SCL wearers (76.2 h/week vs. 86.8 h/week, respectively, p = 0.003). GP wearers had statistically significantly better visual acuity though the difference was not clinically meaningful (p < 0.001). Comfort was poorer among the GP wearers using the Ocular Pain subscale (p < 0.001) but did not differ using a subjective question about comfort. Symptoms were more frequent in GP wearers than SCL wearers (p = 0.002) and were related to reports of discomfort. Significant factors relating to crossing over from GPs to SCLs were lower wearing time with GPs and itching.
  
  
  CONCLUSIONS
  Children are able to successfully wear GP and soft contact lenses. Long-term adaptation occurred more frequently to SCLs than to GPs. The amount of time GP lens wearers are able to comfortably wear their contact lenses and the amount of itching may help determine whether they will remain in that modality.
authors.affiliation: The Ohio State University College of Optometry, Columbus, Ohio 43210, USA. ljordan@optometry.osu.edu
authors.forename: Lisa A
authors.initials: LA
authors.lastname: Jones-Jordan
authors.forename: Jeffrey J
authors.initials: JJ
authors.lastname: Walline
authors.forename: Donald O
authors.initials: DO
authors.lastname: Mutti
authors.forename: Marjorie J
authors.initials: MJ
authors.lastname: Rah
authors.forename: Kelly K
authors.initials: KK
authors.lastname: Nichols
authors.forename: Jason J
authors.initials: JJ
authors.lastname: Nichols
authors.forename: Karla
authors.initials: K
authors.lastname: Zadnik
mesh_terms: D000064:Acclimatization; D002648:Child; D003262:Contact Lenses, Extended-Wear / Q000009:adverse effects / Q000706:statistics & numerical data*; D003263:Contact Lenses, Hydrophilic / Q000009:adverse effects / Q000706:statistics & numerical data*; D005740:Gases; D006801:Humans; D016014:Linear Models; D009216:Myopia / Q000628:therapy*; D017060:Patient Satisfaction; D010539:Permeability; D014785:Vision, Ocular; D014792:Visual Acuity
chemical_list: D005740:Gases
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