@article {Huang475, author = {Jinhai Huang and Jyoti Khadka and Rongrong Gao and Sifang Zhang and Wenpeng Dong and Fangjun Bao and Haisi Chen and Qinmei Wang and Hao Chen and Konrad Pesudovs}, title = {Validation of an instrument to assess visual ability in children with visual impairment in China}, volume = {101}, number = {4}, pages = {475--480}, year = {2017}, doi = {10.1136/bjophthalmol-2016-308866}, publisher = {BMJ Publishing Group Ltd}, abstract = {Objective To validate a visual ability instrument for school-aged children with visual impairment in China by translating, culturally adopting and Rasch scaling the Cardiff Visual Ability Questionnaire for Children (CVAQC).Methods The 25-item CVAQC was translated into Mandarin using a standard protocol. The translated version (CVAQC-CN) was subjected to cognitive testing to ensure a proper cultural adaptation of its content. Then, the CVAQC-CN was interviewer-administered to 114 school-aged children and young people with visual impairment. Rasch analysis was carried out to assess its psychometric properties. The correlation between the CVAQC-CN visual ability scores and clinical measure of vision (visual acuity; VA and contrast sensitivity, CS) were assessed using Spearman{\textquoteright}s r.Results Based on cultural adaptation exercise, cognitive testing, missing data and Rasch metrics-based iterative item removal, three items were removed from the original 25. The 22-item CVAQC-CN demonstrated excellent measurement precision (person separation index, 3.08), content validity (item separation, 10.09) and item reliability (0.99). Moreover, the CVAQC-CN was unidimensional and had no item bias. The person{\textendash}item map indicated good targeting of item difficulty to person ability. The CVAQC-CN had moderate correlations between CS (-0.53, p\<0.00001) and VA (0.726, p\<0.00001), respectively, indicating its validity.Conclusions The 22-item CVAQC-CN is a psychometrically robust and valid instrument to measure visual ability in children with visual impairment in China. The instrument can be used as a clinical and research outcome measure to assess the change in visual ability after low vision rehabilitation intervention.}, issn = {0007-1161}, URL = {https://bjo.bmj.com/content/101/4/475}, eprint = {https://bjo.bmj.com/content/101/4/475.full.pdf}, journal = {British Journal of Ophthalmology} }