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Related Experiment Videos

What do different visual function questionnaires measure?

Robert W Massof1, Lohrasb Ahmadian

  • 1Lions Vision Research and Rehabilitation Center, Wilmer Eye Institute, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA. rmassof@lions.med.jhu.edu

Ophthalmic Epidemiology
|September 27, 2007
PubMed
Summary
This summary is machine-generated.

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Four visual function questionnaires (VFQs) measure the same vision-related ability in visually impaired patients. These VFQs are distinct from the physical and mental health measures of the SF-36.

Area of Science:

  • Ophthalmology
  • Psychometrics
  • Rehabilitation

Background:

  • Numerous visual function questionnaires (VFQs) exist, varying in structure and content.
  • All VFQs aim to assess vision-related functional ability in individuals with visual impairments.

Purpose of the Study:

  • To determine if four popular VFQs measure the same underlying construct in visually impaired patients.
  • To compare the measurement properties of the ADVS, NEI-VFQ, VF-14, and VAQ.

Main Methods:

  • 407 low vision clinic patients completed two of four VFQs (ADVS, NEI-VFQ, VF-14, VAQ) and the SF-36 via telephone.
  • Rasch analysis was applied to patient responses for each VFQ and the SF-36's mental and physical health domains.
  • Principal components analysis was used to evaluate the factor structure of the instruments.

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Main Results:

  • Person measure estimates from the four VFQs were highly correlated, indicating they measure a similar construct.
  • SF-36 mental and physical health domains were uncorrelated with each other and with the VFQs.
  • Principal components analysis revealed three distinct factors: VFQs loaded on the first, SF-36 mental health on the second, and SF-36 physical health on the third.

Conclusions:

  • The four studied VFQs consistently measure vision-related functional ability in low vision patients.
  • This vision-related ability is independent of the physical and mental health aspects assessed by the SF-36.