The Activities of Daily Vision Scale for cataract surgery outcomes: re-evaluating validity with Rasch analysis.
Publication date
2003Keyword
Anterior segment diseaseLens disease
Eye disease
Analysis
Surgery
Vision
Cataract
Evaluation scale
Peer-Reviewed
Yes
Metadata
Show full item recordAbstract
PURPOSE. The Activities of Daily Vision Scale (ADVS) has been extensively validated by traditional methodology. In the current study, Rasch analysis was used to explore further the validity of the ADVS and to determine whether improvements could be made. METHODS. Forty-three patients with cataract underwent visual acuity (VA) and contrast sensitivity (CS) testing and completed the ADVS. The data were Rasch analyzed and the value of response scale and item reduction explored. A shortened version and the original ADVS were tested for criterion validity by determining correlations with VA and CS. RESULTS. The ADVS data contained nonnormally distributed items and items with ceiling effects and empty response categories. Therefore, items benefited from shortening the response scale, the optimum length being three responses. There was poor targeting of item difficulty to patient ability, because many patients with cataract were sufficiently able that they had no difficulty with many activities. Items were eliminated if the task was too easy or did not fit with the overall concept of visual disability determined by the Rasch model. A reduced ADVS version was established that had adequate precision, equivalent criterion validity, and improved targeting of item difficulty to patient ability, but this version was still not ideal. CONCLUSIONS. Despite careful traditional validation, the ADVS data contained inadequacies exposed by Rasch analysis. Through Rasch scaling, particularly with response scale reduction, the ADVS can be improved, but additional questions seem to be needed to suit the more able, including patients undergoing second eye cataract surgery. There remains a need to develop Rasch-scaled measures of visual disability for use in ophthalmic outcomes research.Version
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Pesudovs, K., Garamendi, E., Keeves, J.R. and Elliott, D.B. (2003). The Activities of Daily Vision Scale for cataract surgery outcomes: re-evaluating validity with Rasch analysis. Investigative Ophthalmology and Visual Science. Vol. 44, No. 7, pp. 2892-2899.Link to Version of Record
https://doi.org/10.1167/iovs.02-1075Type
Articleae974a485f413a2113503eed53cd6c53
https://doi.org/10.1167/iovs.02-1075