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 @entity1 with @entity231 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 abnormally 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 @entity1 ability, because many @entity1 with @entity231 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 @entity227 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 @entity1 ability, but this version was still not ideal. CONCLUSIONS: Despite careful traditional validation, the ADVS data contained inadequacies exposed by Rasch analysis. Through @entity2653 , particularly with response scale reduction, the ADVS can be improved, but additional questions seem to be needed to suit the more able, including @entity1 undergoing second eye @entity231 surgery. There remains a need to develop Rasch-scaled measures of @entity227 for use in ophthalmic outcomes research.

The Activities of Daily Vision Scale for XXXX surgery outcomes: re-evaluating validity with Rasch analysis.

@entity1 :: ('9606', 'Species') :: ['patients', 'patient'] @entity227 :: ('MESH:D014786', 'Disease') :: ['visual disability'] @entity2653 :: ('MESH:C538175', 'Disease') :: ['Rasch scaling'] @entity231 :: ('MESH:D002386', 'Disease') :: ['cataract']
@entity231 :: (MESH:D002386,Disease) :: ['cataract']
