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Rasch analysis of the Indian vision function questionnaire.

Vijaya K Gothwal1, Deepak K Bagga, Rebecca Sumalini

  • 1Meera and L B Deshpande Centre for Sight Enhancement, Vision Rehabilitation Centres, L V Prasad Eye Institute, Kallam Anji Reddy Campus, L V Prasad Marg, Banjara Hills, Hyderabad 500034, Andhra Pradesh, India. vijayagothwal@gmail.com

The British Journal of Ophthalmology
|February 7, 2012
PubMed
Summary

The Indian Vision Function Questionnaire's general functioning scale measures both visual functioning and mobility. These two distinct constructs, validated using Rasch analysis, offer effective assessment for visually impaired individuals in India.

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Area of Science:

  • Ophthalmology and Vision Science
  • Psychometrics and Measurement

Background:

  • Assessing vision function in visually impaired populations is crucial for rehabilitation.
  • The Indian Vision Function Questionnaire (IND-VFQ) is a tool used for this purpose.
  • Evaluating the psychometric properties of such questionnaires ensures their validity and reliability.

Purpose of the Study:

  • To evaluate the psychometric properties of the IND-VFQ's general functioning, psychosocial impact, and visual symptoms scales.
  • To apply the Rasch measurement model to assess scale precision, unidimensionality, and targeting.
  • To determine the suitability of the IND-VFQ for visually impaired patients in India.

Main Methods:

  • 236 visually impaired patients completed the 33-item IND-VFQ.
  • Rasch analysis was employed to examine measurement precision (person separation), unidimensionality, and targeting.
  • Item analysis and subscale identification were conducted based on Rasch model outputs.

Main Results:

  • The general functioning scale initially showed adequate measurement precision but lacked unidimensionality.
  • Seven mobility items formed a separate, valid subscale with good targeting.
  • After removing mobility items and a misfitting item, the remaining 13 items represented visual functioning but had suboptimal targeting.

Conclusions:

  • The general functioning scale of the IND-VFQ comprises two distinct unidimensional constructs: visual functioning and mobility.
  • Rasch-scaled versions of both visual functioning and mobility subscales demonstrate good psychometric properties.
  • These validated subscales are effective tools for assessing visually impaired patients in India.