Abstract
PurposeTo assess cataract surgery outcome using the Rasch scaled Chinese version of the Catquest short-form.MethodsThe Chinese translated and culturally adapted version of the Catquest-9SF was interviewer-administered to patients, pre and post cataract surgery. Rasch analysis was performed on the baseline data to revise the Catquest. For the surgical outcome assessment, we stacked pre- and post-surgical Catquest data to demonstrate improvement in visual function scores and responsiveness of the instrument to cataract surgery.ResultsA total of 247 cataract patients (median age, 70 yrs; male 51.0%) completed the Catquest 9SF at baseline.The Catquest-9SF possessed adequate measurement precision of 2.15. No disordering of response categories were observed and all the items perfectly fit to the Rasch model except item 7 (outfit >1.5). A slight reduction in precision was observed after removing misfitting item 7 (Catquest-8SF-CN), but the precision value was well above the acceptable value of 2.00. Notably, the instrument was well targeted (mean person location 0.30), demonstrated no evidence of multidimensionality and DIF. At 12 months post-surgery, 74 (30%) patients came for follow-up and completed the Catquest. There was a significant improvement in the Catquest scores post cataract surgery with a considerably large effect size.ConclusionThe Catquest-8SF-CN demonstrated promising Rasch based psychometric properties and was highly responsive to cataract surgery.
Highlights
Cataract is the leading cause of blindness and vision impairment in the world.[1,2,3] China boasts the largest population in the world and the largest population with cataract.[4,5,6] Even though, a simple surgical procedure can restore vision, the discord that exists between the number of people with cataract and the surgical rate has created a huge backlog of patients needing cataract surgery in China.[7,8] a large population has to live with treatable vision loss and the consequent low quality of life (QoL)
A slight reduction in precision was observed after removing misfitting item 7 (Catquest-8SF-CN), but the precision value was well above the acceptable value of 2.00
There was a significant improvement in the Catquest scores post cataract surgery with a considerably large effect size
Summary
Cataract is the leading cause of blindness and vision impairment in the world.[1,2,3] China boasts the largest population in the world and the largest population with cataract (estimated 2.5 million with cataract and incidence of 400 thousand per year).[4,5,6] Even though, a simple surgical procedure can restore vision, the discord that exists between the number of people with cataract and the surgical rate has created a huge backlog of patients needing cataract surgery in China.[7,8] a large population has to live with treatable vision loss and the consequent low quality of life (QoL). Over the past few decades, many cataract-specific PRO instruments have been developed and validated for use in the developed countries.[14,15,16,17,18] Among the existing cataract-specific PRO instruments, the Catquest-9SF is considered as one of the best cataractspecific instruments in terms of its sound psychometric properties, low respondent burden and responsiveness to cataract surgery.[10,15,18,19]
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