Turkish Version of the Glaucoma Quality of Life-15 Questionnaire

Reliability and Validity of the Turkish Version of the Glaucoma Quality of Life-15 Questionnaire

Glaucoma is a disease with irreversible loss of visual field and optic neuropathy and is the most important cause of irreversible vision loss after cataract in the world. Although clinical evaluations reveal the level of glaucoma quantitatively, it is necessary to evaluate the impact of this pathology on daily functions and quality of life with a holistic perspective and to provide appropriate advice to patients according to the information obtained. Glaucoma Quality of Life -15 Questionnaire (GQoL-15) was developed by Nelson et al. in 2003 to evaluate the quality of life of glaucoma patients. The aim of this study is to translate GQoL-15 into Turkish and evaluate its test-retest reliability for Turkish-speaking population.

Study Overview

• Status: Completed
• Conditions: Quality of Life; Glaucoma
• Intervention / Treatment: Behavioral: Determining quality of life

• Study Type: Observational
• Enrollment (Actual): 127

Contacts and Locations

Study Locations

• Turkey
  • İstanbul, Turkey
    • Yücel Öztürk

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 18 years to 58 years (Adult)
• Accepts Healthy Volunteers: N/A
• Genders Eligible for Study: All

• Sampling Method: Non-Probability Sample

Study Population

Primary Open-Angle Glaucoma patients

Description

Inclusion Criteria:

• Diagnosis of primary open angle glaucoma more than 6 months with visual field tests,
• Have the sufficient cognitive level to answer the scale questions.

Exclusion Criteria:

• To have retinal or optic nerve pathologies that may cause loss of visual field or decrease in visual field except glaucoma,
• To undergo eye surgery in the last 3 months.

Study Plan

How is the study designed?

Design Details

• Observational Models: Case-Only
• Time Perspectives: Prospective

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Glaucoma Quality of Life 15 Questionnaire total score	GQoL-15 total score was got after calculate the all subscale values. Subscales are as; 1) Central and near vision (two questions); 2) Peripheral vision (six questions); 3) Dark adaptation (six questions); 4) Outdoor mobility (one question). The item responses for each factor are marked on a five-point scale (1 meaning no difficulty and 5 meaning severe difficulty), 0 is marked if the participant does not perform the activity because of non-visual causes. Higher GQL-15 total scores and subscale scores are reveals lower QoL.	6 months
25-item National Eye Institute Visual Functioning Questionnaire (NEI-VFQ 25)	NEI-VFQ 25 total score was got after calculate the all values. It is comprised of 25 items which are; general health and vision, ocular pain, difficulty with vision activities, distance-vision activities, limitation of social functioning, mental health problems, role limitations, dependency on others, driving difficulties, difficulty with color vision and difficulty with peripheral vision. A total score of NEI-VFQ 25 is generated by averaging the scores of all subscales except general health. The item responses for factors are marked on a five or six point scale. Subscale score can be calculated, overall total lower score indicates better vision-related QoL.	6 months

Collaborators and Investigators

• Sponsor: Acibadem University
• Collaborators: Haydarpasa Numune Training and Research Hospital
• Investigators: Principal Investigator: Özgül Öztürk, Acibadem University

Study record dates

Study Major Dates

• Study Start (Actual): May 27, 2019
• Primary Completion (Actual): March 1, 2020
• Study Completion (Actual): March 1, 2020

Study Registration Dates

• First Submitted: May 27, 2019
• First Submitted That Met QC Criteria: May 29, 2019
• First Posted (Actual): May 30, 2019

Study Record Updates

• Last Update Posted (Actual): April 8, 2020
• Last Update Submitted That Met QC Criteria: April 7, 2020
• Last Verified: April 1, 2020

More Information

Terms related to this study

• Additional Relevant MeSH Terms: Eye Diseases; Ocular Hypertension; Glaucoma
• Other Study ID Numbers: ATADEK 2019-7/2

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: No

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: No
• Studies a U.S. FDA-regulated device product: No