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Developing a preference-based Glaucoma Utility Index using a discrete choice experiment.

Jennifer M Burr1, Mary Kilonzo, Luke Vale

  • 1Health Services Research Unit, University of Aberdeen, Aberdeen, United Kingdom. j.m.burr@abdn.ac.uk

Optometry and Vision Science : Official Publication of the American Academy of Optometry
|August 19, 2007
PubMed
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Researchers developed the Glaucoma Utility Index, a new measure for glaucoma patients. This tool assesses health outcomes based on patient preferences, showing vision and mobility impact utility the most.

Area of Science:

  • Ophthalmology
  • Health Economics
  • Psychometrics

Background:

  • Glaucoma significantly impacts patients' quality of life.
  • Existing health outcome measures may not fully capture the patient experience in glaucoma.
  • A need exists for a utility-based measure specific to glaucoma.

Purpose of the Study:

  • To develop and estimate a utility-based health outcome measure for glaucoma, termed the Glaucoma Utility Index.
  • To quantify patient preferences for different health states associated with glaucoma.

Main Methods:

  • A six-dimensional profile instrument was developed based on focus groups with glaucoma patients.
  • The discrete choice experiment (DCE) approach was used to derive utility weights.
  • Preference data were collected from 473 individuals with glaucoma.

Related Experiment Videos

Main Results:

  • Regression analysis of 286 consistent DCE responses yielded the Glaucoma Utility Index.
  • Central/near vision, mobility, and activities of daily living significantly impacted utility.
  • Loss of utility was greatest for severe difficulties in vision, followed by mobility and daily activities.

Conclusions:

  • The Glaucoma Utility Index, developed via DCE, is a valid preference-based measure for glaucoma.
  • The index shows theoretical and convergent validity with generic health outcomes and glaucoma severity.
  • Further research is recommended to refine the index using clinically defined glaucoma status and explore QALY frameworks.