Tantirattanakulchai Pankaew, Hounnaklang Nuchanad, Win Nanda, Khambhiphant Bharkbhum, Pongsachareonnont Pear Ferreira
College of Public Health Sciences, Chulalongkorn University, Bangkok, Thailand.
Department of Ophthalmology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand.
Heliyon. 2024 Aug 18;10(16):e36353. doi: 10.1016/j.heliyon.2024.e36353. eCollection 2024 Aug 30.
The Impact of Vision Impairment (IVI) questionnaire is used to assess vision-related quality of life (VRQOL) among patients with visual impairment. This study aims to evaluate the factor structure of the IVI in the context of Thai culture to assess psychometric properties.
This cross-sectional study was conducted between February and July 2022. Purposive sampling was used to include 502 patients with visual impairment who received treatment at a tertiary eye center, King Chulalongkorn Memorial Hospital, Bangkok, Thailand. The data were collected using the interviewer-administered questionnaire. The participants were randomly divided into two groups: one employed for exploratory factor analysis (EFA; n = 251) and the other for confirmatory factor analysis (CFA; n = 251).
EFA yielded 28 items that supported a four-factor structure: behaviors related to mobility and independence (8 items), reading (3 items), self-dependence (7 items), and emotional impact of vision loss (10 items), with a total variance of 64.9 %. The model fit was good: χ2/df = 1.66, CFI = 0.949, TLI = 0.940, RMSEA = 0.052, and SRMR = 0.041. The AIC and BIC for the bifactor four-factor model (17,484.86 and 17,879.41, respectively) were lower than those for the bifactor three-factor model (17,566.44 and 17,961.29, respectively), indicating that the former showed the best fit.
Given its good reliability and validity, the IVI scale has been extensively used to explore the impact of visual impairment on the VRQOL of patients in the clinical setting, thus greatly benefitting researchers, healthcare providers, and ophthalmologists.
视力损害影响（IVI）问卷用于评估视力损害患者与视力相关的生活质量（VRQOL）。本研究旨在评估在泰国文化背景下IVI的因子结构，以评估其心理测量特性。
本横断面研究于2022年2月至7月进行。采用目的抽样法，纳入了502名在泰国曼谷朱拉隆功国王纪念医院三级眼科中心接受治疗的视力损害患者。数据通过访谈员实施的问卷收集。参与者被随机分为两组：一组用于探索性因子分析（EFA；n = 251），另一组用于验证性因子分析（CFA；n = 251）。
探索性因子分析产生了28个项目，支持四因子结构：与移动性和独立性相关的行为（8个项目）、阅读（3个项目）、自我依赖（7个项目）以及视力丧失的情感影响（10个项目），总方差为64.9%。模型拟合良好：χ2/df = 1.66，CFI = 0.949，TLI = 0.940，RMSEA = 0.052，SRMR = 0.041。双因素四因子模型的AIC和BIC（分别为17,484.86和17,879.41）低于双因素三因子模型（分别为
