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 subscale score for each domain was calculated using an average of the scores generated for the component item-level responses. Patients’ perception of visual impairment in glaucoma: Participation restrictions are barriers to involvement in life situations caused by activity limitation, such as inability to go shopping because of questiojnaire to cross the road.

Item response scores of the GQL were added to obtain the summary scores. Sociodemographic and Visual Characteristics of the Glaucoma Patients. Poor targeting is also questuonnaire 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.

The QOL of glaucoma patients being managed in Lagos University Teaching Hospital and an equal number of controls matched for age and sex was assessed using two vision-specific instruments: This strongly suggests that the nine-item instrument is unidimensional.

Validation of a questionnaire for comparing the tolerability of ophthalmic medication.

The fact that there were an equal number of controls and cases as well as an equal number of cases with mild, moderate, or severe glaucoma strengthened the design of this questionnairw. 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.

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

Similarly, three items that are related to light and dark adaptation 3, seeing at night; 6, adjusting to dim lights; 7, going from a light room to a dark room or vice versa are also retained in the short version. Similarly, items loading on first contrast by a minimum of 0.


Published online Sep 3. Detecting and evaluating the impact of multidimensionality using item fit statistics and principal component analysis of residuals.

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

This was perhaps influenced by the presence of cataract or innate photophobia in a subset of patients; thus, the item did not behave as expected and again questionaire removed from the scale. Psychometric Properties and Trade-Offs. However, the unexplained variance explained by the first contrast was 2. Participants were not informed that two different QOL instruments were being administered. Seeing objects coming from the side Patients were 18 years of age or older, spoke German, and had no questionnairr impairment.

This tailoring of item presentation ensures targeting of item difficulty to person ability. As is typical of glaucoma patients, the majority of the study population had low visual disability.

By default, the item mean is placed at 0 logit. Using the GQL, the glare and dark adaptation subscale was the most affected, while the NEIVFQ25 revealed that the general vision and driving subscales were the most affected. Rasch analysis estimates the raw questionnaire data to interval-level data. However, the association was not distinctly different as in the worse and better eye visual field loss. Because visual acuity was not distributed normally, Spearman’s rank test was used to calculate correlation with the Glaucoma Activity Limitation-9 GAL-9 score.

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

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.


Each x represents one participant. Support Center Support Center.

Therefore, infit is considered more informative. Visual function was measured objectively by clinical examination. The product was thereafter converted to a percentage.

There were three groups of 44 participants each, based on severity of disease mild, moderate, and severe. The shorter nine-item instrument had good person separation 2. Generic and disease-specific measures in assessing health status and quality of life.

The Glaucoma Symptom Scale: Which quality of life score is best for glaucoma patients and why? All 15 items fit the Rasch model within liberal infit 0. A cross-sectional analysis using the Geriatric Depression Scale, assessment of function related to vision and the Glaucoma Quality of Life There was a moderate correlation rho: The Glaucoma Quality of Life Questionnaire correlated well with objective measures of visual function and discriminated between quality of life in patients with glaucoma and subjects without glaucoma.

By continuing to use our website, you are agreeing to our privacy policy. Summary scores differed significantly among patients with mild, moderate, and severe glaucoma demonstrating a trend of poorer quality of life with increasing disease severity.

The impact of glaucoma on the quality of life of patients in Norway. The study population consisted of patients who came for regular follow-up in the glaucoma unit of the Department of Ophthalmology at Ludwig-Maximilians-University in Munich, Germany.

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You can manage this and all other alerts in My Account. Poorer QOL and increasing difficulty with vision-related activities were associated with higher subscale scores.

The data were analyzed in two phases: Vision-related quality of life.