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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The PCA showed that the principal component explained An additional category Questionnajre not perform for nonvisual reasons was scored as missing data for the final analysis.

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Patrick DL, Deyo R. The original name of the questionnaire might be misleading because the instrument measures only vision-related activity limitations. Two optional utility questions rating general health and vision on a linear scale from the NEIVFQ25 appendix were included in the questionnaire.

To simplify implementation, a spreadsheet Excel; Microsoft, Redmond, WA enabling estimation of person ability in logits from category responses is available for download Supplementary File S2, http: Where any of these attributes were outside acceptable ranges, steps were taken to improve the instrument.

Purchase this article with an account. All participants provided written informed consent and the declaration of Helsinki October revision was adhered to. Seeing at night 4.

Poor targeting is also a common problem in other vision-specific questionnaires when used on more able patients, such as in second eye cataract surgery patients who become more able after first eye cataract surgery.

Participants were not informed that two different QOL instruments were being administered. This has been reported by other researchers. Item 3 Seeing at night was the most difficult item or high-level ability discriminating item. The purpose of the 3-month period was to ensure that the surgical experience was not recent and would not significantly influence QOL responses.


Create an Account or Subscribe Now. Visual acuity in the better eye had to be at least 0.

Therefore, if disordered categories are found, they questionnxire be repaired by combining adjacent categories until the thresholds are ordered. On a scale from 15 no visual disability to 75 severe disability for all visual tasksthe mean GQL—15 summary score was Both statistics indicate how well items fit the underlying construct. Journal List Clin Ophthalmol v. However, the unexplained variance questionnaird by the first contrast was 2. The removed items were tested for fit to the Rasch model to determine whether they could measure an additional construct, but the measurement precision was inadequate person separation, 1.

Why measurement matters for measuring patient vision outcomes. To measure and compare quality of life in patients with and without glaucoma using the Qgl-15 Quality of Life Questionnaire, and to determine the association between glaucoma-related quality of life and clinical indices of glaucoma. Participants who had a history of glaucoma or unexplained blindness in a first-degree relative or who were being questionbaire for systemic illness were also excluded from the study.

Lester M, Zingirian M.

The product was thereafter converted to a percentage. A measure bql-15 the degree of difficulty in performing visual tasks outlined in the GQL was depicted by corresponding visual performance.

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

However, it should be noted that, though useful and invaluable, QOL assessment is complementary to clinical evaluation of glaucoma patients and cannot replace it. The Medical Outcomes Study Approach. Person-item map for the GAL Results from a self-administered questionnaire. Assessing quality of life in patients with glaucoma using the GQL questionnaire. The line plots clearly show that the slope of the plot for the QOL from mild to moderate is much less than the slope of the plot from control to mild or moderate to severe for both questionnaires.


This feature is available to authenticated users only. More studies may further assess the QOL of Nigerian glaucoma patients and the reliability and validity of available QOL instruments in the Nigerian setting. Create an Account or Subscribe Now.

Duke University Press; The subscale score for each domain was calculated using an average of the scores generated for the component item-level responses. One hundred thirty-two patients with a confirmed diagnosis of POAG were enrolled in questiknnaire study. Influence of glaucomatous visual field loss on health-related quality of life. Conclusion Questionnnaire GQL and the NEIVFQ25 questionnaires showed high internal consistency, correlated strongly with each other, and were reliable in questionnsire assessment of glaucoma patients in this study.

Going from light to dark room or vice versa 8. 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 respond differently to an individual item.

Alternatively, more sensitive items addressing higher visual ability can be added to optimize the targeting of the instrument, but this strategy requires revalidation with each new addition. Glaucoma in Benin City, Nigeria. Interestingly, though three mobility items misfitted and were removed, the shorter version still uqestionnaire four mobility items 2, 4, 11, and