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Published on: February 11, 2014
The development of the Indian vision function questionnaire: field testing and psychometric evaluation
S K Gupta1, K Viswanath, R D Thulasiraj
1Dr Rajendra Prasad Centre for Ophthalmic Sciences, All India Institute of Medical Sciences, New Delhi, India.
The British Journal of Ophthalmology
|April 19, 2005
Summary
The Indian vision function questionnaire (IND-VFQ33) is a reliable and valid tool for assessing vision function. This patient-centered measure is suitable for populations in low-income countries.
Area of Science:
- Ophthalmology
- Public Health
- Psychometrics
Background:
- Patient-reported outcome measures (PROMs) are crucial for evaluating vision function.
- Existing vision function questionnaires may not adequately address the needs of diverse populations, particularly in low-income settings.
- There is a need for a culturally relevant and psychometrically sound vision function questionnaire for use in India.
Purpose of the Study:
- To develop and evaluate the Indian vision function questionnaire (IND-VFQ).
- To assess the acceptability, reliability, validity, and responsiveness of the IND-VFQ.
- To provide a patient-defined measure of vision function for populations in low-income countries.
Main Methods:
- A 45-item interviewer-administered questionnaire was developed from qualitative studies.
- The questionnaire was administered to patients with cataract, glaucoma, diabetic retinopathy, age-related macular degeneration, and normal controls.
- Standard psychometric methods were used for item reduction and evaluation of properties.
Main Results:
- Psychometric item reduction resulted in a 33-item questionnaire (IND-VFQ33).
- The IND-VFQ33 demonstrated good acceptability, high internal consistency (alpha >0.80), and excellent test-retest reliability (>0.89).
- All scales showed moderate convergent/discriminant validity and good responsiveness to change after cataract surgery.
Conclusions:
- The IND-VFQ33 is a psychometrically sound measure of vision function.
- It addresses a gap in patient-defined measures for populations in low-income countries.
- The IND-VFQ33 is a valuable tool for research and clinical practice in ophthalmology.
