Back to Search
Start Over
Are standard instruments valid for the assessment of quality of life and symptoms in glaucoma?
- Source :
-
Optometry and vision science : official publication of the American Academy of Optometry [Optom Vis Sci] 2007 Aug; Vol. 84 (8), pp. 789-96. - Publication Year :
- 2007
-
Abstract
- Purpose: To determine if the impact of Visual Impairment Instrument (IVI) and Glaucoma Symptom Scale (GSS) are valid instruments to assess participation in daily living and ophthalmic complaints, respectively, in a glaucoma population.<br />Methods: Patients with glaucoma were recruited from private and public clinics and completed the IVI and GSS questionnaires. The two scales were assessed for fit to the Rasch model. Unidimensionality, individual item and person fit to the model, response category performance (how respondents differentiate between the response options), differential item functioning (how subgroups, despite equal levels of the underlying trait, respond differently to an individual item), and targeting of items to patients (good spread of items across the full range of patients' scores) were assessed.<br />Results: One hundred seventy-five participants (mean age = 71 year) were recruited. The majority (65%) had primary open angle glaucoma and good presenting visual acuity >or=6/9 in the better eye (87%). Only one-third of the participants had severe visual field loss in both eyes. Disordered thresholds were evident across all GSS items, indicating that the categories were difficult to discriminate and required category collapsing (5 to 3 categories). There was no evidence of person and item misfit, differential item functioning, and multidimensionality. However, both scales displayed ineffective person-item targeting as a large number of participants demonstrated little difficulty with the most difficult items.<br />Conclusions: Because of unsatisfactory targeting, The IVI and GSS are suboptimal scales to assess patients with glaucoma but relatively good vision. It is likely that items could be added to optimize the performance of both instruments. There may however be a need to develop a glaucoma-specific instrument to assess Quality of Life in this population.
- Subjects :
- Activities of Daily Living
Adult
Aged
Aged, 80 and over
Female
Glaucoma complications
Glaucoma, Open-Angle physiopathology
Humans
Male
Middle Aged
Models, Psychological
Models, Statistical
Psychometrics methods
Vision Disorders etiology
Visual Fields
Glaucoma physiopathology
Quality of Life
Surveys and Questionnaires standards
Visual Acuity
Subjects
Details
- Language :
- English
- ISSN :
- 1040-5488
- Volume :
- 84
- Issue :
- 8
- Database :
- MEDLINE
- Journal :
- Optometry and vision science : official publication of the American Academy of Optometry
- Publication Type :
- Academic Journal
- Accession number :
- 17700342
- Full Text :
- https://doi.org/10.1097/OPX.0b013e3181334b83