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 two questionnaires had good reliability indices.

Walking on uneven ground 5. This suggests a high degree of correlation between similar domains or subscales of both instruments. Disordering of the threshold can occur when a category is underused, its definition is unclear, or the number of categories exceeds the number of levels respondents can distinguish. A cross-sectional analysis using the Geriatric Depression Scale, assessment of function related to vision glq-15 the Glaucoma Quality of Life PesudovsNone; C. In conclusion, the revised GAL-9 has superior psychometric properties, including unidimensionality and good measurement precision with the added advantage of low respondent burden.

It is simply unlikely that many patients with glaucoma would questionnaide the categories of quite a lot of difficulty or severe difficulty.

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

Interestingly, though three mobility items misfitted and were removed, the shorter version still contains four mobility items 2, 4, 11, and Going from light to dark room or vice versa 8. 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. Activity limitations are the difficulties in executing vision-related tasks as a result of impairment, such as inability to cross the road because of glaucomatous visual field loss.

A scale of 0 to 5 was used to code the item level responses: The GQL had an excellent measurement precision but demonstrated poor targeting of item difficulty to person ability and multidimensionality, indicating that it was measuring more than one construct.

The item measure of the scale ranged from 1. The original GQL was developed in English. This site uses cookies.


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

Create an Account or Subscribe Now. Rasch analysis was queztionnaire on the GQL questionnaire data according to the Andrich Rating scale model using joint likelihood estimation with the Winsteps version 3. Therefore, if disordered categories are found, they should be repaired by combining quedtionnaire categories until the thresholds are ordered. Indeed, the GAL-9 is the only PRO designed for use in glaucoma patients to have been demonstrated to have satisfactory psychometric properties the Glaucoma Symptom Scale does not.

The overall scores of both questionnaires correlated best with each other rho: Which quality of life score is best for glaucoma patients questioonnaire why? However, it was not a unidimensional scale. 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. Table 2 shows the sociodemographic and visual characteristics of the participants.

To calculate the subscale scores for the four domains of the GQL, the item level responses were scored on a questiionnaire interval scale ranging from 0, indicating no difficulty, toindicating severe difficulty.

No further contrast exceeded 2. J Ophthalmic Vis Res. Adjusting to bright lights 6. Two items 1 and 15 were underfitting, and three items 8, 12, and 10 were overfitting the Rasch model Table 3.

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 study. The primary aim of the present study was to auestionnaire the psychometric properties of the GQL using Rasch analysis and to assess whether it forms a valid scale. Invest Ophthalmol Vis Sci. This shows that both questionnaires appeared to correlate nearly equally with the visual field indices in the present study.

Similarly, items loading on first contrast by a minimum of 0.

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

Both statistics indicate how well items fit the underlying construct. The person separation value for the GQL was excellent 3. Given that MD and the nine-item questionnaire score person estimate in logit were normally distributed, Pearson’s correlation coefficient was used to calculate correlation between them. The Visual Activities Questionnaire: In this study we assessed QoL using the GQL—15 in a cohort of patients with Tql-15 and correlated self—reported visual disability with objective measures of visual function.


Lawerance Erlbaum Associates; One can therefore infer that glare and poor quetsionnaire to darkness may account for some of the difficulties glaucoma patients experience with driving. Duke University Press; The GQL has a five-category response scale that performs well.

Because visual acuity was not distributed normally, Spearman’s rank test was used to calculate correlation with the Glaucoma Questionhaire Limitation-9 GAL-9 score.

Both questionnaires, however, did not detect a significant difference in the QOL scores of patients with mild and moderate glaucoma.

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Patients with mental or systemic illness, and hearing, cognitive or mobility defects were excluded from the study. 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.

Participants were free to withdraw from the study at any time and their decision did not affect any aspect of the care they were receiving from the institution. The fact that there is no universally acceptable gold standard for categorizing disease severity in glaucoma could account for this.

N Engl J Med. Sociodemographic and Visual Characteristics of the Glaucoma Patients. Hence, the shorter version is a better measure than the GQL of vision-related activity limitation in patients with glaucoma. The GQL is a item questionnaire designed to take into account the effect of binocular visual field loss on visual function. An additional category Do not perform for nonvisual reasons was scored as missing data for the final analysis.

The relationship between visual field loss in glaucoma and health-related quality-of-life.