The Italian Catquest-9SF cataract questionnaire: translation, validation and application.

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Abstract

To validate the Catquest-9SF questionnaire in Italian, assess the change in visual disability with cataract surgery and determine the correlation between pre-operative Catquest-9SF scores and Lens Opacities Classification System (LOCS) III cataract grading.

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Most cited references 33

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Statistical methods for conducting agreement (comparison of clinical tests) and precision (repeatability or reproducibility) studies in optometry and ophthalmology.

Colm McAlinden, Jyoti Khadka, Konrad Pesudovs (2011)

The ever-expanding choice of ocular metrology and imaging equipment has driven research into the validity of their measurements. Consequently, studies of the agreement between two instruments or clinical tests have proliferated in the ophthalmic literature. It is important that researchers apply the appropriate statistical tests in agreement studies. Correlation coefficients are hazardous and should be avoided. The 'limits of agreement' method originally proposed by Altman and Bland in 1983 is the statistical procedure of choice. Its step-by-step use and practical considerations in relation to optometry and ophthalmology are detailed in addition to sample size considerations and statistical approaches to precision (repeatability or reproducibility) estimates. Ophthalmic & Physiological Optics © 2011 The College of Optometrists.

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The development of an instrument to measure quality of vision: the Quality of Vision (QoV) questionnaire.

Sophie E. Moore, Konrad Pesudovs, Colm McAlinden … (2010)

To develop an instrument to measure subjective quality of vision: the Quality of Vision (QoV) questionnaire. A 30-item instrument was designed with 10 symptoms rated in each of three scales (frequency, severity, and bothersome). The QoV was completed by 900 subjects in groups of spectacle wearers, contact lens wearers, and those having had laser refractive surgery, intraocular refractive surgery, or eye disease and investigated with Rasch analysis and traditional statistics. Validity and reliability were assessed by Rasch fit statistics, principal components analysis (PCA), person separation, differential item functioning (DIF), item targeting, construct validity (correlation with visual acuity, contrast sensitivity, total root mean square [RMS] higher order aberrations [HOA]), and test-retest reliability (two-way random intraclass correlation coefficients [ICC] and 95% repeatability coefficients [R(c)]). Rasch analysis demonstrated good precision, reliability, and internal consistency for all three scales (mean square infit and outfit within 0.81-1.27; PCA >60% variance explained by the principal component; person separation 2.08, 2.10, and 2.01 respectively; and minimal DIF). Construct validity was indicated by strong correlations with visual acuity, contrast sensitivity and RMS HOA. Test-retest reliability was evidenced by a minimum ICC of 0.867 and a minimum 95% R(c) of 1.55 units. The QoV Questionnaire consists of a Rasch-tested, linear-scaled, 30-item instrument on three scales providing a QoV score in terms of symptom frequency, severity, and bothersome. It is suitable for measuring QoV in patients with all types of refractive correction, eye surgery, and eye disease that cause QoV problems.

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Quality assessment of ophthalmic questionnaires: review and recommendations.

Colm McAlinden, Konrad Pesudovs, Jyoti Khadka (2013)

The aim of this article was to systematically review all the available ophthalmic patient-reported outcome (PRO) instruments (questionnaires) that demonstrated interval measurement properties to identify the instruments with the highest psychometric quality for use in different eye diseases and conditions. An extensive literature review was carried out to identify all existing ophthalmic PRO instruments. Instruments were then excluded if they did not have demonstrable interval measurement properties; the remaining instruments were reviewed. The quality of the following psychometric properties was assessed: content development (initial item development process), performance of the response scale, dimensionality (whether the instrument measures a single construct), measurement precision, validity (convergent, concurrent, discriminant, and known groups), reliability (test-retest), targeting (whether the items are appropriate [e.g., difficulty level] for the population), differential item functioning (whether subgroups of people respond differently to an item), and responsiveness. The search identified 48 PRO instruments that demonstrated interval measurement properties, and these were relevant to nine applications: glaucoma, dry eye, refractive errors, cataract, amblyopia and strabismus, macular diseases, adult low vision, children low vision, and others. These instruments were evaluated against the psychometric property quality criteria and were rated for quality based on the number of criteria met. This review provides a descriptive catalog of ophthalmic PRO instruments to inform researchers and clinicians on the choice of the highest-quality PRO instrument suitable for their purpose.

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Author and article information

Journal

Journal ID (iso-abbrev): Eye Vis (Lond)

Title: Eye and vision (London, England)

Publisher: Springer Nature

ISSN (Print): 2326-0254

Publication date (Electronic): 2016

Volume: 3

Affiliations

[1 ] University Eye Clinic of Trieste, Ospedale Maggiore, Trieste, Italy ; Department of Ophthalmology, Singleton Hospital, ABM University Health Board, Swansea, SA2 8QA UK.

[2 ] University Eye Clinic of Trieste, Ospedale Maggiore, Trieste, Italy.

[3 ] Department of Clinical Sciences, Ophthalmology, Faculty of Medicine, Lund University, Lund, Sweden.

[4 ] Cornea & Refractive Surgery Service, Massachusetts Eye & Ear Infirmary, Department of Ophthalmology, Harvard Medical School, Boston, USA.

[5 ] ABM University Health Board, Swansea, UK ; Flinders University, Bedford Park, Adelaide, South Australia Australia ; Wenzhou Medical University, Wenzhou, Zhejiang China.

Article

Publisher Item ID: 43

DOI: 10.1186/s40662-016-0043-9

PMC ID: 4848863

PubMed ID: 27127797

SO-VID: c3ddba5e-58a8-4493-87c0-275edf532001

History

Keywords: Cataract,Cataract surgery,Catquest-9SF,Patient-reported outcomes,Questionnaires,Rasch analysis

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Keywords: Cataract, Cataract surgery, Catquest-9SF, Patient-reported outcomes, Questionnaires, Rasch analysis

The Italian Catquest-9SF cataract questionnaire: translation, validation and application.

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Most cited references 33

Statistical methods for conducting agreement (comparison of clinical tests) and precision (repeatability or reproducibility) studies in optometry and ophthalmology.

The development of an instrument to measure quality of vision: the Quality of Vision (QoV) questionnaire.

Quality assessment of ophthalmic questionnaires: review and recommendations.

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