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-15 questionnaires in Nigerian glaucoma patients

Finding dropped objects Walking after dark 3. Hence, we have proposed a new name for the short-version instrument, the GAL-9 questionnaire. Quality of life in patients with early, moderate and advanced glaucoma.

In Rasch analysis, measurement precision of an instrument is denoted by person separation. The focus of this study was on primary open-angle glaucoma POAGwhich is the most common variant of glaucoma in Nigeria.

Patients had the greatest difficulty with activities affected by glare and dark adaptation in the GQL Patients with POAG on medical therapy or those who had had trabeculectomy at least 3 months before the study were eligible. Niger Postgrad Med J. The refractive status and vision profile: It is simply unlikely that many patients with glaucoma would endorse the categories of quite a lot of difficulty or severe difficulty.

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

The main problem identified in the Rasch analysis of the GQL is multidimensionality, illustrated by the PCA of the residuals and supported by item fit statistics. One can therefore infer that glare and poor adaptation to darkness may account for some of the difficulties glaucoma patients experience with driving.


None of the 15 items showed DIF by age or sex Table 3. The fact that there is no universally acceptable gold standard for categorizing disease severity in glaucoma could account for this. Gq,-15 person separation of 2. KerntNone; C.

Rasch analysis was performed to assess category function how respondents differentiated between the response optionsmeasurement precision discriminative abilityunidimensionality whether items measure a single constructtargeting whether items are of appropriate difficulty for the sampleand differential item functioning whether comparable subgroups qudstionnaire differently to an individual item.

Seeing objects coming from gal-15 side Associations between normally distributed data were described by Pearson correlation coefficient, whereas Spearman rank correlation was used if one datum or both data were not distributed normally. Glaucoma in Benin City, Nigeria. View Original Download Slide. The elimination of multidimensionality is essential to the validity of this instrument; therefore, item removal was undertaken.

Item 5 misfitted infit, 1. Such a process is lengthy, time consuming, and qquestionnaire not guarantee avoidance of poor targeting.

There was a strong correlation between the overall scores of both questionnaires rho: Evaluation of quality of life for patients with glaucoma. You will receive an email whenever this article is corrected, updated, or cited in the literature. Evaluation of the relationship between quality of vision and visual function in Japanese glaucoma patients. Depression and quality of life in patients with glaucoma: To measure and compare quality of life in patients with and without glaucoma using the Glaucoma Quality of Life Questionnaire, and to determine the association between glaucoma-related quality of life and clinical indices of glaucoma.


This has been reported by other researchers. The GQL and the NEIVFQ25 questionnaires showed high internal consistency, correlated strongly with each other, and were reliable in the assessment of glaucoma patients in this study. All the items in the GQL Table 1 are scored on a five-category difficulty scale, as follows: The purpose of the 3-month period was to ensure that the surgical experience was not recent and would not significantly influence QOL responses.

However, removing these categories may lead to loss of valuable psychometric information when the instrument is used on patients with higher disability.

Validation of a questionnaire for comparing the tolerability of ophthalmic medications. Nevertheless, the diagnosis, which requires lifelong follow-up and frequent ocular antihypertensive medication or surgery, can have a huge impact on a patient’s life.

One hundred thirty-two patients with a confirmed diagnosis of POAG were enrolled in the study. This feature is available to authenticated users only. Participants who had a history of glaucoma or unexplained blindness in a first-degree relative or who were being managed for systemic illness were also excluded from the study.

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Open in a separate window. Quality of life in patients with early, moderate and advanced glaucoma.

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