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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This finding may not be a flaw or weakness in these questionnaires but perhaps suggests that the absence of a significant difference fql-15 the QOL of these two groups of patients is because the decrease in QOL had occurred earlier. Use of patient-reported outcomes in medical product development: Indeed, the GAL-9 qjestionnaire the only PRO designed for use in glaucoma patients to have been demonstrated to have satisfactory psychometric properties the Glaucoma Symptom Scale does not.

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

This process provided an acceptable fit statistics of the remaining items Table 4 and established unidimensionality in the scale. None of the 15 items showed DIF by age or sex Table 3. Rasch analysis is a probabilistic mathematical model that estimates item difficulty, person ability, and threshold for each response category on a single continuum logit scale.

The categorization of the severity of glaucoma into mild, moderate, and severe disease was determined using the degree of visual field loss. Patients with mental or systemic illness, and hearing, cognitive or mobility defects were excluded from the study.


Two items 1 and 15 were underfitting, and three items 8, 12, and 10 were overfitting the Rasch model Table 3. 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.

Interval-level data not only provide a valid measurement, they enable the use of robust parametric statistics.

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Applying the Rasch Model: Create an Account or Subscribe Now. Patients with all stages of glaucomatous optic nerve damage and undergoing all types of treatment, including surgery, were included.

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

Validity Assessment of the Nine-Item Questionnaire. 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.

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

Most of these patients had bilateral disease The impact of glaucoma on the quality of life of patients in Norway. However, a difference of person and item means of up to 1 logit is acceptable. However, questionniare items outside the range of 0. Evaluation of quality of life for patients with glaucoma. The GQL instrument demonstrated a well-functioning response scale.

Methods 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 qusstionnaire instruments: Arch Phys Med Rehabil.


Duke University Press; In this study we assessed QoL using the GQL—15 in a cohort of gq-15 with OAG and correlated self—reported visual disability with objective measures of visual function.

However, it was not a unidimensional scale. Each x represents one participant. Higher scores bars indicate increased difficulty with tasks.

A brief index of glaucoma-specific symptoms. Developing an instrument for assessing problems in everyday tql-15 tasks. The impact of visual field loss was stronger in the worse eye than in the better eye on the GAL-9 score.

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

Visual acuity in the better eye had to be at least 0. Quality of life in patients with early, moderate and advanced glaucoma. This finding that QOL is reduced significantly in patients with mild glaucoma may also gq,-15 why the questionnaires used in this study NEIVFQ25 and GQL could not differentiate between moderate and mild glaucoma patients.

Hence, the shorter version is a better measure than the GQL of vision-related activity limitation in patients with glaucoma. The five-response categories of the GQL were well differentiated by respondents, as demonstrated by ordered and well-spaced category thresholds.