Measuring benefits and patients' satisfaction when glasses are not needed after cataract and presbyopia surgery: scoring and psychometric validation of the Freedom from Glasses Value Scale (FGVS©)

BMC Ophthalmology

Research Article

Gilles Berdeaux¹  Benoit Arnould²  Muriel Viala-Danten²  Juliette Meunier² 

[1] Health Economics Eurmea, Alcon Laboratories, 4, rue Henri Sainte-Claire Deville, 92563, Rueil-Malmaison Cedex, France;Statistics and Psychometrics, Mapi Values, 27, rue de la Villette, 69003, Lyon, France;

关键词: Cataract;    Global Evaluation;    Astigmatism;    Dimension Score;    Item Reduction;   

DOI  :  10.1186/1471-2415-10-15

 received in 2009-06-16, accepted in 2010-05-24,  发布年份 2010

来源: Springer

【 摘 要 】

BackgroundThe purpose of this study was to reduce the number of items, create a scoring method and assess the psychometric properties of the Freedom from Glasses Value Scale (FGVS), which measures benefits of freedom from glasses perceived by cataract and presbyopic patients after multifocal intraocular lens (IOL) surgery.MethodsThe 21-item FGVS, developed simultaneously in French and Spanish, was administered by phone during an observational study to 152 French and 152 Spanish patients who had undergone cataract or presbyopia surgery at least 1 year before the study. Reduction of items and creation of the scoring method employed statistical methods (principal component analysis, multitrait analysis) and content analysis. Psychometric properties (validation of the structure, internal consistency reliability, and known-group validity) of the resulting version were assessed in the pooled population and per country.ResultsOne item was deleted and 3 were kept but not aggregated in a dimension. The other 17 items were grouped into 2 dimensions ('global evaluation', 9 items; 'advantages', 8 items) and divided into 5 sub-dimensions, with higher scores indicating higher benefit of surgery. The structure was validated (good item convergent and discriminant validity). Internal consistency reliability was good for all dimensions and sub-dimensions (Cronbach's alphas above 0.70). The FGVS was able to discriminate between patients wearing glasses or not after surgery (higher scores for patients not wearing glasses). FGVS scores were significantly higher in Spain than France; however, the measure had similar psychometric performances in both countries.ConclusionsThe FGVS is a valid and reliable instrument measuring benefits of freedom from glasses perceived by cataract and presbyopic patients after multifocal IOL surgery.

【 授权许可】

Unknown   
© Berdeaux et al; licensee BioMed Central Ltd. 2010. This article is published under license to BioMed Central Ltd. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.