Meera and L B Deshpande Centre for Sight Enhancement, Vision Rehabilitation Centres, L V Prasad Eye Institute, Hyderabad, India.
Invest Ophthalmol Vis Sci. 2013 Jul 18;54(7):4871-81. doi: 10.1167/iovs.13-11892.
A multi-attribute utility instrument (MAUI) consists of a descriptive system in which the items and responses seek information about a concept of the universe of health-related quality of life (QoL), and responses to these items then are weighted and combined to produce the index. To our knowledge, the 6-item Vision and Quality of Life Index (VisQoL) is the only available vision-related MAUI, developed and validated in Australia, specifically for visually impaired (VI) populations. To our knowledge, the psychometric properties of the VisQoL have not yet been investigated in an Indian VI sample; this was the aim of our study.
The Indian VisQoL was administered to 349 VI adults face-to-face by a trained interviewer at the Vision Rehabilitation Centres of a tertiary eye care facility, South India. Rasch analysis was used to assess the psychometric properties.
Rescoring was necessary for all except one item before ordered thresholds were obtained. All items fit the Rasch model and unidimensionality was confirmed. Person separation was acceptable (2.01), indicating that the instrument can discriminate among three strata of participants" vision-related QoL (VRQoL). The VisQoL items were targeted substantially to the participants" VRQoL (-0.69 logits). One item ("ability to have friendships") demonstrated large differential item functioning by work status; working participants reported the item to be more difficult (-1.13 logits) relative to other items when compared to the nonworking participants.
The 6-item Indian VisQoL satisfies unidimensional Rasch model expectations in VI patients. Disordering of response categories was evident; replication is required before a common rescoring option should be considered.
多属性效用仪器（MAUI）由一个描述性系统组成，其中项目和响应旨在获取有关健康相关生活质量（QoL）概念的信息，然后对这些项目进行加权和组合以生成指数。据我们所知，6 项视力和生活质量指数（VisQoL）是唯一可用的与视力相关的 MAUI，它是在澳大利亚开发和验证的，专门针对视力受损（VI）人群。据我们所知，VisQoL 的心理测量特性尚未在印度 VI 样本中进行研究；这是我们研究的目的。
在印度南部的一家三级眼科保健机构的视力康复中心，由经过培训的访谈者面对面地向 349 名 VI 成年人施测印度 VisQoL。使用 Rasch 分析评估心理测量特性。
在获得有序阈值之前，所有项目都需要重新评分，除了一个项目。所有项目都符合 Rasch 模型，证实了单维性。人员分离是可接受的（2.01），表明该仪器可以区分参与者的三个视力相关生活质量（VRQoL）层次。VisQoL 项目主要针对参与者的 VRQoL（-0.69 对数单位）。有一个项目（“建立友谊的能力”）根据工作状况显示出较大的差异项目功能；与非工作参与者相比，工作参与者报告该项目比其他项目更难（-1.13 对数单位）。
6 项印度 VisQoL 在 VI 患者中满足单维 Rasch 模型的期望。反应类别混乱明显；在考虑通用重新评分选项之前，需要进行复制。
