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: Dile Togis
Country: Libya
Language: English (Spanish)
Genre: Travel
Published (Last): 28 February 2014
Pages: 407
PDF File Size: 14.96 Mb
ePub File Size: 14.15 Mb
ISBN: 116-1-35776-173-7
Downloads: 7050
Price: Free* [*Free Regsitration Required]
Uploader: Kigasar

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

The enrolment strategy aimed to match the cases and controls by 5-year age categories and by sex. Evaluation of quality of life for patients with glaucoma.

Highlighting their importance, the US Food and Drug Administration has also endorsed that PRO measures be included in all clinical trial end points for disease impact and outcome assessment in glaucoma.

It would also have been interesting to investigate the correlation between the binocular visual fields on the questionnaire score. Patrick DL, Deyo R. Rasch analysis was performed on the GQL questionnaire data according to the Andrich Rating scale model using joint likelihood estimation with the Winsteps version 3. They showed similarities in their correlation with visual function, visual field indices, and their ability to differentiate between patients with varying severity of glaucoma.

The degree of refractive error acceptable was less than 5 DS from emmetropia or less than 2 DCyl of astigmatism. Interval-level data not only provide a valid measurement, they enable the use of robust parametric statistics.

The focus of this study was on primary open-angle glaucoma POAGwhich is the most common variant of glaucoma in Nigeria. 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.

This study shows that the GQL functions within the Rasch model in terms of measurement precision, response category functioning, and DIF.


Using a prospective, cross-sectional study, we collected demographic information via interviews and administered quesfionnaire questionnaire to assess glaucoma-related quality of life in patients with glaucoma and 31 subjects without glaucoma.

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.

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. 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 ggql-15 to an individual item.

A comparison showed no significant difference in the results after excluding these participants so the study results are presented without excluding them.

All the items of the GQL are scored on a five-category response scale of increasing difficulty and, therefore, have four thresholds. Quality of life in patients with early, moderate and advanced glaucoma. Nevertheless, the diagnosis, which requires lifelong follow-up and frequent ocular antihypertensive medication or surgery, can have a huge impact on a patient’s life. Optimizing rating scale category effectiveness.

Evaluation of the relationship between quality of vision and visual function in Japanese glaucoma patients. The data were analyzed in two phases: Purchase this article with an account. Participants who questionnaife 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.

Going from light to dark room or vice versa 8. The 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

However, a difference of person and item means of bql-15 to 1 logit is acceptable. Adjusting to bright lights 6. Figure 4 clearly shows that participants had the greatest difficulty with tasks affected by glare and dark adaptation. Despite an insidious onset without symptoms, patients with open—angle glaucoma OAG may experience difficulty with daily activities from its queztionnaire stage questionnairf.


Iester M Zingirian M. Such a process is lengthy, time consuming, and does not guarantee avoidance of poor targeting. A new measure of patient satisfaction with ocular hypotensive medications: Generic and disease-specific measures in qkestionnaire health status and quality of life.

The minimum score was zero and the maximum score for each item was Item response scores of the GQL were added to obtain the summary scores. Further analysis will reveal whether specific visual functions, such as glare and dark adaptation, are affected preferentially in early, moderate or advanced OAG. Categories with low frequency can be problematic because they do not provide stable threshold values, and it may be recommended that they be collapsed into adjacent categories to eliminate noise that may arise from unstable calibrations.

Poorer QOL and increasing difficulty with vision-related activities were associated with higher subscale scores. Summary scores differed significantly among patients with mild, moderate, and severe glaucoma demonstrating a trend of poorer quality of life with increasing disease severity.

Mild glaucoma patients had a mean age of Patients with mental or systemic illness, and hearing, cognitive or mobility defects were excluded from the study. The GQL instrument demonstrated a well-functioning response scale.

On a scale from 15 no visual disability to 75 severe disability for all visual tasksthe mean GQL—15 summary score was J Cataract Refract Surg. The categorization questionnalre the severity of glaucoma into mild, moderate, and severe disease was determined using the degree of visual field loss.

As is typical of glaucoma patients, the majority of the study population had low visual disability. KerntNone; C.

The Glaucoma Symptom Scale: Skalicky S Goldberg I.