Assessing the Turkish DDIVAT for Visual Acuity Measurement (NCT07240480) | Clinical Trial Compass
Not Yet RecruitingNot Applicable
Assessing the Turkish DDIVAT for Visual Acuity Measurement
200 participantsStarted 2025-12-01
Plain-language summary
The goal of this observational methodological study is to validate the Turkish version of the DDIVAT visual acuity measuring device in a Turkish-speaking adult population.
The main questions it aims to answer are:
Does the Turkish version of the DDIVAT provide reliable and valid visual acuity measurements in Turkish speakers?
Are the results of the DDIVAT comparable to those obtained with the standard Snellen chart used in clinical practice?
Researchers will compare DDIVAT visual acuity test results with Snellen chart results to see if both methods produce consistent measurements.
Participants will:
Be adults aged 18 years or older, including both patients and healthy volunteers.
Undergo visual acuity testing using the DDIVAT system displayed on a smart TV connected to the university server.
Have their visual acuity re-measured using the standard Snellen optotype under the same conditions.
No medication or invasive procedure will be used. The study carries no risk to participants.
Who can participate
Age range
18 Years
Sex
ALL
See this in plain English?
AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Inclusion Criteria:
* Adults aged 18 years or older
Turkish-speaking individuals able to understand the study purpose
Willingness to participate and provide written informed consent
Participants with or without refractive errors (e.g., myopia, hyperopia, astigmatism)
Exclusion Criteria:
* Age below 18 years
Individuals unable to complete visual acuity testing
Presence of severe ocular pathology (e.g., corneal opacity, retinal detachment) that prevents accurate measurement
Cognitive or communication difficulties preventing informed consent
Questions worth asking your doctor
Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.
1Based on my diagnosis and history, is this trial worth exploring for me — or is there a standard treatment we should try first?
2What does this trial's phase tell us about how much is already known about its safety and benefit?
3What would taking part actually involve for me — visits, tests, time, and travel?
4What are the known and possible risks or side effects I should weigh, and how would they be monitored?
5If this trial isn't the right fit, what other options or trials would you suggest I look into?
Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.
Questions for the trial coordinator
The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.
1What does taking part actually involve week to week — how many visits, where, and how long does each one take?
2What costs are covered by the study, and what might I have to pay for myself, including travel, parking, or time off work?
3What happens during screening, and what happens if the study team confirms I don't meet the criteria after those tests?
4Who pays for the scans, blood work, and other tests the trial requires — the study, my insurance, or me?
5How will being in the trial affect my regular care, and will my own doctor stay informed and involved?
6Can I leave the trial at any point if I change my mind, and what would happen to my care if I do?
A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.
What they're measuring
1
Agreement between DDIVAT (Turkish version) and Snellen chart visual acuity measurements
Timeframe: During a single study visit (same day assessment)