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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This suggests a high degree of correlation between similar domains or subscales of both instruments. Seeing objects coming from the side Eye Lond ; 16 1: Management of ocular hypertension: Poor targeting questionnakre because of items clustering at a certain point along the map, large gaps between items, and the higher or lower ability of the study population than the required level of ability to endorse the items.

For example they may be related to near vision correction rather than to glaucoma; hence, these items do not behave predictably across the whole population.

Because visual acuity qestionnaire not distributed normally, Spearman’s rank test was used to calculate correlation with the Glaucoma Activity Limitation-9 GAL-9 score. Finding dropped objects Psychometric properties of visual functioning index using Rasch analysis. Conclusion 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.

Support Center Support Center. This was perhaps influenced by the presence of cataract or innate photophobia in a subset of patients; thus, the item did not behave as quedtionnaire and again was removed from the scale. Crossing the road Such a process is lengthy, time consuming, and does not guarantee avoidance of poor targeting.

Patients had the greatest difficulty with activities affected by glare and dark adaptation in the GQL Two hundred sixty-four participants were recruited cases and controls for the present study. Its only limitation is poor targeting of item difficulty to person ability, which is an inevitable attribute of a vision-related activity limitation instrument for glaucoma patients, most of whom have only peripheral visual field defects and little difficulty with daily activities.


N Engl J Med. The shorter nine-item instrument had good person separation 2. The contrasts in the residuals report unexplained variance by the principal component. However, those items outside the range of 0. Discussion The two questionnaires had good reliability indices. A new name, the Glaucoma Activity Limitation GAL-9 questionnaire, is proposed for the short version, which better reflects the construct under measurement.

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

This study shows that the GQL functions within the Rasch model in terms of measurement precision, response questionnzire functioning, and DIF. Translation and back-translation methods were used by competent bilingual translators to ensure accuracy. 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. Rasch analysis of visual function and quality of life questionnaires.

The number of people with qudstionnaire worldwide in and Activity limitations are the difficulties in executing vision-related tasks as a result of impairment, such as questionnalre to cross the road because of glaucomatous visual field loss. The study population consisted of patients who came for regular follow-up in the glaucoma unit qiestionnaire the Department of Ophthalmology at Ludwig-Maximilians-University in Munich, Germany. Walking after dark 3. The same is true in questionnaires.

A new questionnaire, the GQL—15, has been specifically developed to assess quality of life QoL in glaucoma patients by measuring severity of visual disability for 5 key activity groups: Similarly, items loading on first contrast by a minimum of 0. 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.


Table 2 shows the sociodemographic questonnaire visual characteristics of the participants. You will receive an email whenever this article is corrected, updated, or cited in the literature.

This strongly suggests that the nine-item instrument is unidimensional. A cross-sectional analysis using the Geriatric Depression Scale, assessment of function related to vision and the Glaucoma Quality of Life Only a modest or weak correlation existed between the pattern standard deviation of patients and both the NEIVFQ25 rho: Items with fit statistics outside the acceptable range appear in bold. Hence, an item bank with the use of CAT provides a rapid, precise, and accurate measurement of the impact of disease on patients.

The nature of suffering and the goals of medicine.

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

Rasch analysis is a probabilistic mathematical model that estimates item difficulty, person ability, and threshold for each response category on a single continuum logit scale. Although it may seem inconsistent to remove some items and retain others within these two conceptual areas, the key issue is that the items retained behave predictably within the whole item set across the entire glaucoma population whereas the removed items did not.

Other studies have also reported that visual field loss in the worse eye has a great influence in self-reported visual disability in patients with glaucoma.

Quality of life in newly diagnosed glaucoma patients: Quality of life in patients with early, moderate and advanced glaucoma.