McAlinden Colm, Skiadaresi Eirini, Gatinel Damien, Cabot Florence, Huang Jinhai, Pesudovs Konrad
School of Medicine, Flinders Medical Centre and Flinders University, Adelaide, South Australia, Australia.
Optom Vis Sci. 2013 Aug;90(8):760-4. doi: 10.1097/OPX.0b013e3182993856.
The purpose of this study is to evaluate the interchangeability of the three subscales of the Quality of Vision (QoV) questionnaire: Frequency, Severity and Bothersome. This will indicate if any of the subscales are predictive of one another and whether respondents need to complete all three subscales.
Data from four studies were pooled together, totaling 1930 completed questionnaires. Patient groups consisted of spectacle wearers, contact lens wearers, post-laser refractive surgery (including laser in situ keratomileusis, laser-assisted subepithelial keratectomy, and photorefractive keratectomy surgeries for various refractive errors), patients with cataract, and patients having undergone lens implantation surgery (consisting of monofocal, multifocal, and pseudoaccommodative intraocular lenses). The Bland-Altman limits of agreement (LoA) method was used to assess the interchangeability between the three subscales of the QoV questionnaire.
The mean difference, standard deviation of the differences, and the LoA for the Frequency versus Severity subscale was 2.8570, 6.784, and -10.4397 to 16.1537, respectively. The mean difference, standard deviation of the differences, and the LoA for the Frequency versus Bothersome subscale was 5.4674, 12.5768, and -19.1831 to 30.1179, respectively. The mean difference, standard deviation of the differences, and the LoA for the Severity versus Bothersome subscale was 2.6104, 9.4444, and -15.9006 to 21.1213, respectively.
The wide LoA found in this study indicate that the three subscales of the QoV questionnaire (Frequency, Severity and Bothersome.) measure different aspects of the latent trait, quality of vision. Users should continue to use all three subscales of the questionnaire to achieve a comprehensive assessment of subjective quality of vision.
本研究旨在评估视觉质量（QoV）问卷三个子量表的互换性：频率、严重程度和困扰程度。这将表明是否有任何子量表能够相互预测，以及受访者是否需要完成所有三个子量表。
汇总四项研究的数据，共有1930份完整问卷。患者群体包括眼镜佩戴者、隐形眼镜佩戴者、激光屈光手术后（包括针对各种屈光不正的准分子原位角膜磨镶术、激光辅助上皮下角膜磨镶术和光性屈光性角膜切削术）、白内障患者以及接受晶状体植入手术的患者（包括单焦点、多焦点和伪调节性人工晶状体）。采用Bland-Altman一致性界限（LoA）方法评估QoV问卷三个子量表之间的互换性。
频率与严重程度子量表的平均差异、差异标准差和LoA分别为2.8570、6.784和-10.4397至16.1537。频率与困扰程度子量表的平均差异、差异标准差和LoA分别为5.4674、12.5768和-19.1831至30.1179。严重程度与困扰程度子量表的平均差异、差异标准差和LoA分别为2.6104、9.4444和-15.9006至21.1213。
本研究中发现的较宽的LoA表明，QoV问卷的三个子量表（频率、严重程度和困扰程度）测量了潜在特质视觉质量的不同方面。使用者应继续使用问卷的所有三个子量表，以全面评估主观视觉质量。
