title: The predictability of retention and discontinuation of contact lenses.
abstract: BACKGROUND
  The objective of this research was to investigate the possibility of predicting the retention or discontinuation of contact lenses on the basis of their effect on the quality of life of the wearer. While most studies of discontinuation of assistive technology devices have focused on other than psychosocial causes of discontinuation, there is reason to believe that a major cause is the psychosocial effect of the device on the user.
  
  
  METHODS
  Participants were 418 adult volunteers who had been fitted with contact lenses. One hundred eighty of the participants had discontinued wearing their lenses, while 238 were still wearing their lenses. The participants were asked to complete a recently developed questionnaire, the Psychosocial Impact of Assistive Devices Scales (PIADS), which measures the psychosocial impact of assistive devices, and is used also to predict retention and discontinuation of other assistive devices.
  
  
  RESULTS
  Overall correct prediction of the 418 respondents was 68.9%. The PIADS was better at predicting discontinuation than retention among males, while the reverse was true for females.
  
  
  CONCLUSIONS
  The PIADS was shown to be a valid instrument to predict retention and discontinuation of contact lenses.
authors.affiliation: School of Occupational Therapy, University of Western Ontario, London, Canada. jjutai@uwo.ca
authors.forename: Jeffrey
authors.initials: J
authors.lastname: Jutai
authors.forename: Hy
authors.initials: H
authors.lastname: Day
authors.forename: William
authors.initials: W
authors.lastname: Woolrich
authors.forename: Graham
authors.initials: G
authors.lastname: Strong
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003261:Contact Lenses / Q000706:statistics & numerical data*; D005260:Female; D006305:Health Status Indicators; D006801:Humans; D008297:Male; D008875:Middle Aged; D017063:Outcome Assessment, Health Care; D017060:Patient Satisfaction; D011788:Quality of Life; D012029:Refraction, Ocular; D012030:Refractive Errors / Q000628:therapy*; D016312:Treatment Refusal