Abstract:: Purpose: Despite an insidious onset without symptoms, patients with open–angle glaucoma (OAG) may experience difficulty with daily activities from. Purpose.: To investigate, using Rasch analysis, whether the item Glaucoma Quality of Life (GQL) forms a valid scale and to optimize. Abbreviation / Long Form: GQL / Glaucoma Quality of Life Questionnaire Abbreviation: GQL (>> Co-occurring Abbreviation). Long Form: Glaucoma.

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Both statistics indicate how well items fit the underlying construct. The original GQL was developed in Gq-15. The impact of visual field loss was stronger in the worse eye than in the better eye on the GAL-9 score.

Lawerance Erlbaum Associates; Rasch analysis generates a person-item map that provides a visual observation of the relative position of item difficulty to person ability. In Figure 2the spread of each item calibration is visualized compared with the range of person ability estimates.

As is typical of glaucoma patients, the majority of the study population had low visual disability. Rasch analysis of visual function and quality of life questionnaires.

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Hence, an item bank with the use of CAT provides a rapid, precise, and accurate measurement of the impact of disease on patients. Nelson et al, 16 on the other hand, found a statistically significant difference in the GQL QOL scores of mild and severe glaucoma patients but did not find a statistically significant difference in scores of patients with mild and moderate glaucoma, as in the present study, or in those with moderate and severe glaucoma.

Discussion The two questionnaires had good reliability indices. Rasch analysis permits testing of differential item functioning DIF.


questionbaire On the basis of MD in better eye, One hundred eighteen glaucoma patients mean age, The GQL is a item questionnaire designed to take into account the effect of binocular visual field loss on visual function.

Interval-level data not only provide a valid measurement, they enable the use of robust parametric statistics.

Glaucoma Quality of Life Questionnaire (GQL) – Allie: Abbreviation / Long Form Info.

Fundamental Measurement in the Human Science. Adjusting to bright lights 6. POAG was defined as the presence of glaucomatous optic nerve head changes, open anterior chamber angles, and visual field loss gqk-15 or without an elevated IOP in one or both eyes.

Support Center Support Center. Impact of visual field loss on health-related QOL in glaucoma. Participants were free to withdraw from the study at any time and their decision did not affect any aspect of the care they were receiving from the institution.

A comparison showed no significant difference in the results after excluding these participants so the study results are presented without excluding them. Results Patients had the greatest difficulty with activities affected by glare and dark adaptation in the GQL Visual function quesfionnaire measured objectively by clinical examination. Exclusion criteria for cases The presence of refractive errors greater than 5 DS or 2 diopters Cylinder DCylvisually significant cataracts greater than Stage 2 Quesyionnaire III classification28 or any other ocular pathology were criteria for exclusion from the study.

Psychometric Properties and Trade-Offs. View Original Download Slide. In Rasch analysis, measurement precision of an instrument is denoted by person separation.

Sociodemographic and Visual Characteristics of the Glaucoma Patients. Measurement of health-related quality of life with glaucoma: Each x represents one participant. Methods The QOL of glaucoma patients being managed in Lagos University Teaching Hospital and an equal number of controls matched for quedtionnaire and sex was assessed using two vision-specific instruments: The NEIVFQ25 a nonglaucoma-specific questionnaire and the GQL a glaucoma-specific questionnaire are compared in this study with a view to assessing their correlation in this group of participants and to determine which of the instruments is better suited to assess QOL issues in Nigerian glaucoma patients, given the paucity of data on QOL for this population.


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There is also a clear decrease in QOL when mild cases are compared to controls. However, the unexplained variance explained by the first contrast was 2. Patients with secondary glaucoma or angle-closure glaucoma were also excluded.

A comparison of the NEIVFQ25 and GQL questionnaires in Nigerian glaucoma patients

Accuracy and precision of objective refraction from wavefront aberrations. The fact that there were an equal number of controls and cases as well as an equal number of cases with mild, moderate, or severe glaucoma strengthened the design of this study.

The participants are represented by x on the leftand items are located on the right of the dashed line. The development of an instrument to measure quality of vision: Indeed, the GAL-9 is the only PRO designed for use qyestionnaire glaucoma patients to have been demonstrated to have satisfactory psychometric properties the Glaucoma Symptom Scale does not.

Rasch analysis was performed on the GQL questionnaire data according to the Andrich Rating scale model using joint likelihood estimation with the Winsteps version 3.

Skalicky S Goldberg I. Poorer QOL and increasing difficulty with vision-related activities were associated with higher subscale scores. This article questionnairf been cited by other articles in PMC. Human grasp point selection.