Using Rasch analysis to revisit the validity of the Cataract TyPE Spec instrument for measuring cataract surgery outcomes

Abstract

With minor modifications, the Cataract TyPE Spec questionnaire and its glare and near-vision subscales were good measures of visual functioning in the cataract patient. Additional items to suit the more able, including patients having second-eye surgery, could improve the measurement properties.

Improvements in visual ability with first-eye, second-eye, and bilateral cataract surgery measured with the Visual Symptoms and Quality of Life Questionnaire

“…6,[12][13][14] The VSQ also shares the same deficiency and the claim that it is specifically suited to measuring outcomes in second-eye surgery patients cannot be confirmed. Indeed, 2 items specifically designed for second-eye patients (difficulty pouring liquids and judging distances) were 2 of the 3 easiest items, as shown by their position at the top of the person-item map ( Figure 2).…”

“…However, our previous studies [12][13][14][15][16][17] found that these questionnaires are not sensitive to patients having second-eye surgery because of a ceiling effect (ie, high percentage of responses in the most able end category of the response categories). Ceiling effects occur when patients are able to perform all activities listed in a questionnaire; that is, they record a score of no disability (full functioning).…”

Assessment of patient satisfaction with outcomes of and ophthalmic care for cataract surgery

“…In our study, patients with other ocular diseases were not included; indeed, the percentage of cataract surgery patients with ocular comorbidities varies from 25.0% to 47.9%. 10,11 Because ocular comorbidities can affect the results of the cataract surgery, it would be interesting to assess the satisfaction in this population.…”

“…3 Other instruments to assess cataract surgery outcomes have been validated using Rasch analysis. [10][11][12] For example, the Impact of Visual Impairment questionnaire was validated in a cataract population. 10 This questionnaire measures cataract surgery outcome results across 3 subscales of participation in activities of daily living (reading and accessing information, mobility and independence, and emotional well-being).…”

Pilot Study of Industry Perspective on Requirement Engineering Education: Measurement of Rasch Analysis

“…Content [7,12], construct [3] and predictive [13] validity is crucial in getting the sufficient result of the study. Survey questionnaire in this research used two types of scale.…”