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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Validity refers to the assessment of whether an instrument measures what it purports to measure.

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

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. The refractive status and vision profile: The development, assessment, and selection of questionnaires.

Permission to republish any abstract or part of an abstract in any form must be obtained in writing from the ARVO Office prior to publication.

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. All participants provided written informed consent and the declaration of Helsinki October revision was adhered to.


The product was thereafter converted to a percentage. Therefore, infit is considered more informative. The standard cutoff range for MNSQ is from 0.

KhadkaNone; K. 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. Summary scores differed significantly among patients with mild, moderate, and severe glaucoma demonstrating a trend of poorer quality of life with increasing disease severity.

This shows that both questionnaires appeared to correlate nearly equally with the visual field indices in the present study. Quesfionnaire five items that initially misfit items 1, 8, 10, 12 and 15 were removed one at a time.

A comparison of the NEIVFQ25 and GQL-15 questionnaires in Nigerian glaucoma patients

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

Indeed, the GAL-9 is the only PRO designed for use in glaucoma patients to have been demonstrated to have satisfactory psychometric properties the Glaucoma Symptom Scale does not.

In Figure 2the spread of each item calibration is visualized compared with the range of person ability estimates.

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

Therefore, if disordered categories are found, they should be repaired by combining adjacent categories until the thresholds are ordered. Tripping over objects 9. Patrick DL, Deyo R.


To establish unidimensionality in the GQL, six items 1, 5, 8, 10, 12, and 15 were considered for removal on the basis of the PCA of the residuals and fit statistics. Results from a self-administered questionnaire. The relationship between visual field loss in glaucoma and health-related quality-of-life.

One hundred eighteen glaucoma patients completed the German version of the GQL by self-administration. Interestingly, though three mobility items misfitted and were removed, the shorter version still contains four mobility items 2, 4, 11, and All 15 items fit the Rasch model within liberal infit 0. McAlindenNone; M. Human grasp point selection. Assessing quality of life in patients with glaucoma using the GQL questionnaire.

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More studies may further assess the QOL of Nigerian glaucoma patients and the reliability and validity of available QOL instruments in the Nigerian setting. Glare and dark adaptation subscale scores of the GQL increased with increasing severity of disease mild: Both statistics indicate how well items fit the underlying construct.

On a scale from 15 no visual disability to 75 severe disability for all visual tasksthe mean GQL—15 summary score was Crossing the road