The Impact of Vision Impairment Questionnaire: An Evaluation of Its Measurement Properties using Rasch Analysis

Ecosse Luc Lamoureux · Julie Pallant · Konrad Pesudovs · Jennifer B. Hassell · Jill Elizabeth Keeffe

228 citations0/0 files storedInvestigative Ophthalmology & Visual Science

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Psychometric Methodologies and Testing Ophthalmology and Visual Impairment Studies Health Education and Validation

Abstract

PURPOSE: To explore the psychometric properties of the Impact of Vision Impairment scale (IVI) by using Rasch analysis. METHODS: Three hundred fourteen first-time referrals to low-vision clinics completed the 32-item IVI. The data were Rasch-analyzed with a partial credit model using RUMM2020 software (RUMM Laboratory, Perth, WA, Australia). The overall fit of the model, response scale, individual item fit, differential item functioning, unidimensionality, and person-separation reliability were assessed. RESULTS: Initially, 26 items displayed disordered thresholds. However, collapsing the response scale to three categories (4 items) and four categories (28 items) produced ordered response thresholds for all items. Four items with high proportions of missing responses, poor spread, high skewness, and deviation between observed and expected model curves were then removed. This adjustment produced overall fit to the Rasch model (item-trait interaction chi(2) = 118.3; P = 0.32). The final mean (SD) person and item fit residuals ere 0.06 (0.85) and -0.20 (1.45), respectively. The person-separation reliability was 0.9, indicating that the scale was able to discriminate between several different groups of participants. The revised scale was well targeted to the participants, with similar mean locations for items (0.00) and persons (0.16). A significant difference between participants of mild, moderate, and severe visual impairment (ANOVA; P 0.001) supported the criterion validity of the Rasch-scaled IVI. CONCLUSIONS: The results provide support for the measurement properties of the Rasch-scaled 28-item version of the IVI and of its potential for assessing outcomes of low-vision rehabilitation. A raw score-to-Rasch person measure conversion is supplied.

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References

1961Probabilistic Models for Some Intelligence and Attainment Tests 1982A Rasch Model for Partial Credit Scoring 1978A Rating Formulation for Ordered Response Categories 1994Differential Item Functioning.1982Rating scale analysis 2007An introduction to the Rasch measurement model: An example using the Hospital Anxiety and Depression Scale (HADS)2002Detecting and evaluating the impact of multidimensionality using item fit statistics and principal component analysis of residuals.1989Observations are always ordinal; measurements, however, must be interval.

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2013Quality Assessment of Ophthalmic Questionnaires 2010Remediating serious flaws in the National Eye Institute Visual Function Questionnaire 2007The Impact of Vision Impairment Questionnaire: An Assessment of Its Domain Structure Using Confirmatory Factor Analysis and Rasch Analysis 2010The Psychometric Validity of the NEI VFQ-25 for Use in a Low-Vision Population 201351 Improving the individual work performance questionnaire using rasch analysis

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