Development of an instrument to measure glaucoma medication self-efficacy and outcome expectations

B. Sleath, S. J. Blalock, A. Robin, M. E. Hartnett, D. Covert, B. Devellis, A. Giangiacomo

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose The Purpose of this study was to develop and evaluate the psychometric properties of (a) a glaucoma medication self-efficacy scale and (b) a glaucoma outcome expectations scale.Patients and MethodsTwo instruments were developed: a glaucoma medication self-efficacy scale and a glaucoma outcome expectations scale. Packets containing (a) the instruments and patient demographic questions and (b) a letter explaining the study were distributed to 225 glaucoma patients from three ophthalmology practices between August and December 2007. The instrument was completed by 191 patients for a response rate of 85%. Principal components factor analysis with a varimax rotation and Cronbach's α reliability were used to analyse the data. To assess discriminant validity, we administered the scales and two self-reported measures of adherence in a separate sample of 43 glaucoma patients who were currently using at least one glaucoma medication.Results Our results yielded a 21-item self-efficacy in overcoming barriers that might interfere with the use of glaucoma medications scale, a 14-item self-efficacy in carrying out specific tasks required to use eye drops correctly scale, and a four-item glaucoma outcome expectations scale. Results of the Cronbach's α reliability indicated that the scales are internally consistent. The self-efficacy scales were both significantly associated with two patient self-reported measures of glaucoma medication adherence, which show discriminant validity.Conclusion sEye care providers and researchers can use these scales to identify patients with low self-efficacy in using their glaucoma medications and patients who do not believe that following their eye care providers advice can help their vision.

Original languageEnglish (US)
Pages (from-to)624-631
Number of pages8
JournalEye
Volume24
Issue number4
DOIs
StatePublished - Apr 2010

Keywords

  • Adherence
  • Expectations
  • Glaucoma
  • Outcome
  • Self-efficacy

ASJC Scopus subject areas

  • Ophthalmology
  • Sensory Systems

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