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

On a scale from 15 no visual disability to 75 severe disability for all visual tasksthe mean GQL—15 summary score was The Glaucoma Symptom Scale.

Summary scores differed significantly among patients with mild, moderate, and severe glaucoma demonstrating a trend of poorer quality of life with increasing disease severity. Skalicky S Goldberg I. This is a measure of discriminative ability of an instrument.

Significant correlations between the GAL and visual parameters have demonstrated its validity. 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. Person-item map for the GAL Create an Account or Subscribe Now. Purchase this article with an account. You must be signed into an individual account to use this feature. The purpose of the 3-month period was to ensure that the surgical experience was not recent and would not significantly influence QOL responses.

Walking after dark 3. This finding that QOL is reduced significantly in patients with mild glaucoma may also explain why the questionnaires used in this study NEIVFQ25 and GQL could not differentiate between moderate and mild glaucoma patients. Invest Ophthalmol Vis Sci. This was also the case for participants with severe and mild glaucoma.


The items in the first PCA contrasts and the misfitting items were removed one by one until all items had fit statistics ranging from 0.

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The GQL has a five-category response scale that performs well. The minimum score was zero and the maximum score for each item was As is typical of glaucoma patients, the majority of the study population had low visual disability. Adjusting to bright lights 6.

This suggests that assessment of QOL should be done at the onset of the disease whether or not there is documentation of visual loss preperimetric glaucoma.

Depression and quality questionniare life in patients with glaucoma: The Glaucoma Symptom Scale: Table 2 shows the sociodemographic and visual characteristics of the participants. Psychometric properties of visual functioning index using Rasch analysis.

The nature of suffering and the goals of medicine. The impact of visual field loss was stronger in the worse eye than in the better eye on the GAL-9 score.

Patient reported outcomes in glaucoma: For glaucoma management, it is imperative that the two constructs under measurement be segregated into identifiable components.

The two questionnaires had good reliability indices. The average score quextionnaire each domain was calculated from the individual item scores.

This suggests that the belief that patients with mild glaucoma do not have a reduction in QOL until a visual threshold is reached is probably erroneous and corresponds with recent studies that suggest that QOL is reduced in glaucoma patients who are not even aware that they have the disease and in those who are in early stages of the disease. A significant association between instrument score and visual field loss was found in this study.


Published online Gq-15 3.

Observations are always ordinal; measurements, however, must be interval. Interval-level data not only provide a valid measurement, they enable the use of robust parametric questiomnaire.

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

Bumping into objects This site uses cookies. Duke University Press; Further analysis will reveal whether specific visual functions, such as glare and dark adaptation, are affected preferentially in early, moderate or advanced OAG. A higher score signified a better QOL. Why measurement matters for measuring patient vision outcomes. To investigate, using Rasch analysis, whether the item Glaucoma Quality of Life GQL forms a valid scale and to optimize its psychometric properties. There were ordered thresholds between all response categories, indicating that each category had distinct meaning.

This article has been cited by other articles in PMC. The summary NEIVFQ25 score was obtained by calculating the average of the domain scores with the exclusion of the general health domain score.

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