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Patient-Reported Spectacle Independence Questionnaire (PRSIQ): Development and Validation.

Robert Morlock1, R J Wirth2, Steven R Tally3

  • 1PRO-Spectus, San Diego, California.

American Journal of Ophthalmology
|March 26, 2017
PubMed
Summary

A new questionnaire, the Patient-Reported Spectacle Independence Questionnaire (PRSIQ), accurately measures spectacle independence after cataract surgery. This tool helps assess patient-reported outcomes and functional vision without glasses.

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Area of Science:

  • Ophthalmology
  • Patient-Reported Outcomes

Background:

  • Cataract surgery aims to restore vision, but quantifying spectacle independence is crucial for assessing surgical success.
  • Existing methods may not fully capture the nuances of patient-reported spectacle independence.

Purpose of the Study:

  • To develop and validate a questionnaire to quantify spectacle independence following cataract surgery.
  • To create a reliable and valid patient-reported outcome measure for post-cataract surgery vision.

Main Methods:

  • A mixed-methods approach involving literature review, expert and patient interviews, and cognitive testing.
  • Development of the Patient-Reported Spectacle Independence Questionnaire (PRSIQ) based on qualitative findings.
  • Quantitative validation using confirmatory factor analysis, item response theory, reliability, and validity analyses.

Main Results:

  • Qualitative data revealed discrepancies between patients' self-assessment of spectacle independence and actual correction use.
  • The PRSIQ was developed to assess both patient-reported behavior and functional vision at various distances without correction.
  • Quantitative analyses confirmed the PRSIQ's discriminant and convergent validity, supporting its use.

Conclusions:

  • The Patient-Reported Spectacle Independence Questionnaire (PRSIQ) is a validated tool for measuring spectacle independence post-cataract surgery.
  • The PRSIQ provides robust evidence for assessing spectacle independence through its total score.