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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View Original Download Slide. A new name, the Glaucoma Activity Limitation GAL-9 questionnaire, is proposed for the short version, which better reflects the construct under measurement. Using wuestionnaire 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.

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. The higher the person separation, the more groups the instrument can distinguish.

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.

The number of people with glaucoma worldwide in and Vision-related quality of life. The authors thank Pia Thomczyk for participant management and data collection.

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

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

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


Person-item map for the GQL Detecting and questionnairre the impact of multidimensionality using item fit statistics and principal component analysis of residuals.

Visual function and quality of life in patients with glaucoma. Invest Ophthalmol Vis Sci. Reduced QoL in these patients correlates strongly with reduced VA, severity of visual field defects and presence of binocular field defects.

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

There is also a clear decrease in QOL when mild cases are compared to controls. In conclusion, the revised GAL-9 has superior psychometric properties, including unidimensionality and good measurement precision with the added advantage of low respondent burden. The overall scores of both questionnaires correlated best with each other rho: Why measurement matters for measuring patient vision outcomes. Rasch analysis permits testing of differential item functioning DIF.

Niger Postgrad Med J. KhadkaNone; K. A significant association between instrument score and visual field loss was found in this study. J Ophthalmic Vis Res. The items in the first PCA contrasts and the misfitting items were removed one by one until all items had fit statistics ranging from 0.

This article has been cited by other articles in PMC. Optimizing rating scale category effectiveness.

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Therefore, if disordered categories are found, they should be repaired by combining adjacent categories until the thresholds are ordered. Quality of life in newly diagnosed glaucoma patients: The focus of this study was on primary open-angle glaucoma POAGwhich is the most common variant of glaucoma in Nigeria. Patient-centred measurement in ophthalmology—a paradigm shift. On the basis of MD in better eye, To simplify implementation, a spreadsheet Excel; Microsoft, Redmond, WA enabling estimation of person ability in logits from category responses is available for download Supplementary File S2, http: The Sickness Impact Profile: Questionnaige item bank consists of a larger number of Rasch-calibrated items in a pool, which are presented by computer-adaptive testing CAT to patients on the basis of their response to previous items.


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

Measuring Functioning and Well-Being: It is simply unlikely that many patients with glaucoma would endorse the questionnnaire of quite a lot of difficulty or severe difficulty. Despite an insidious onset without symptoms, patients with open—angle glaucoma OAG may experience difficulty with daily activities from its early stage onwards. Accessed August 7, Participation restrictions are barriers to involvement in life situations caused by activity limitation, such as inability to go shopping because of inability to cross the road.

All participants provided written informed consent and the declaration of Helsinki October revision was adhered to. Please review our privacy policy.

Accuracy and precision of objective refraction from wavefront aberrations. It would also have been interesting to investigate the correlation between the binocular visual fields on the questionnaire score. Person-item map for the GAL This is an Open Access article which permits unrestricted noncommercial use, provided gq-l15 original work is properly cited.

This is a fundamental problem because it becomes unclear what the instrument measures. Item response scores of the GQL were gql-115 to obtain the summary scores.

Depression and quality of life in patients with glaucoma: Patients with mental or systemic illness, and hearing, cognitive or mobility defects were excluded from the study. Figure 1 shows the ordered response options qjestionnaire a distinct peak for each response category. Rasch analysis estimates the raw questionnaire data to interval-level data.