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.

Author: Kazijin Kazikasa
Country: South Africa
Language: English (Spanish)
Genre: Finance
Published (Last): 13 September 2013
Pages: 267
PDF File Size: 4.6 Mb
ePub File Size: 7.72 Mb
ISBN: 336-1-71830-206-1
Downloads: 23209
Price: Free* [*Free Regsitration Required]
Uploader: Tygoktilar

A cross-sectional analysis using the Geriatric Depression Scale, assessment of function related to vision and the Glaucoma Quality of Life Further analysis will reveal whether specific visual functions, such as glare and dark adaptation, are affected preferentially in early, moderate or advanced OAG. Similarly, items loading on first contrast by a minimum of 0. The development, assessment, and selection of questionnaires.

Skalicky S, Goldberg I.

Reasonable mean-square fit values. By continuing to use our website, you are agreeing to our privacy policy. Disordering of the threshold bql-15 occur when a category is underused, its definition is unclear, or the number of categories exceeds the number of levels respondents can distinguish.

By continuing to use our website, you are agreeing to our privacy policy.

The corresponding visual performance was To investigate, using Rasch analysis, whether the item Glaucoma Quality of Life GQL forms a valid scale and to optimize its psychometric properties.

Two hundred sixty-four participants were recruited cases and controls for the present study. The categories are used in the order questilnnaire, and each occupies a wide portion of the measurement wuestionnaire. This suggests that the belief that patients with mild glaucoma do not have a reduction in QOL until a visual threshold is reached is probably erroneous and corresponds with recent studies that suggest that QOL is reduced in glaucoma patients who are not even aware that they have the disease and in those who are in questionaire stages of the disease.


National Center for Biotechnology InformationU.

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

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. It would also have been interesting to investigate the correlation between the binocular visual fields on the questionnaire score. In this study we assessed QoL using the GQL—15 in a cohort of patients with OAG and correlated suestionnaire visual disability with objective measures of visual function.

J Cataract Refract Surg. The Glaucoma research community questionnire FDA look to the qufstionnaire On the basis of MD in better eye, 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.

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

Observations are always ordinal; measurements, however, must be interval. Footnotes Disclosure The authors report no conflict of interest in this work. For this analysis, the person with higher ability and items of greater difficulty were located on the negative side of the logit scale and vice versa.

Walking after dark 3. Our analysis suggests that the GQL largely measures one construct vision-related activity limitation but is contaminated by a mobility construct that appears to be different. A new measure of patient satisfaction with ocular hypotensive medications: Clinical Decisions in Glaucoma. The GQL instrument demonstrated a well-functioning response scale. 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.

Significant correlations between the GAL and visual parameters have demonstrated its validity.

All the items in the GQL Table 1 are scored on a five-category difficulty scale, as follows: Patients had the greatest difficulty with activities affected by glare and dark adaptation in the GQL The focus of this study was on primary open-angle glaucoma POAGwhich is the most common variant of glaucoma in Nigeria. Yql-15 in a separate window. The category threshold is the crossover point between response categories and indicates the point at which the likelihood of choosing either response category is the same.


Patients with POAG on medical therapy or those who had had trabeculectomy at least 3 months before the study were eligible. Quality of life in glaucoma and its relationship with visual function. As in the longer version, the remaining nine items were also free of DIF by age and sex. These activities may be important in glaucoma patients, 41 but Rasch analysis identified these items tap a different construct so are as a source of noise and multidimensionality in this activity limitations scale.

Psychometric Questionnarie and Trade-Offs.

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

A number of glaucoma-specific questionnaires or instruments have been developed in the past two decades. 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.

The same is true in questionnaires. Figure 1 shows the ordered response options with a distinct peak for each response category. This has been reported by other researchers. They showed similarities in their correlation with visual function, visual field indices, and their ability to differentiate between patients with varying severity of glaucoma. Figure 4 clearly shows that participants had the greatest difficulty with tasks affected by glare and dark adaptation.

The authors plan to validate these versions in a subsequent multicenter study. Health Qual Life Outcomes.