Assessing the Turkish DDIVAT for Visual Acuity Measurement

Sponsor
Trakya University
Study ID
NCT07240480
Status
Not Yet Recruiting

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Conditions

  • Astigmatism
  • Hyperopia
  • Myopia
  • Refractive Errors
  • Visual Acuity

Eligibility Criteria

Sex
ALL
Age
18 Years - N/A
Healthy Volunteers
Accepted

Interventions

  • DDIVAT Visual Acuity Test (Turkish Version) — DIAGNOSTIC_TEST
    Participants' visual acuity will be measured using the Turkish version of the DDIVAT digital visual acuity device and compared with Snellen chart results. No treatment or invasive procedure will be performed.

Study Details

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.

Key Dates

First listed
Nov 21, 2025
Start date
Dec 1, 2025
Status verified
Oct 2025
Primary completion
Apr 30, 2026
Completion
May 31, 2026

Study Design

Enrollment
200 participants (estimated)

Arms

  • Arm: Participants Undergoing Visual Acuity Testing
    All enrolled participants (n = 200) will complete two visual acuity measurements during a single visit: one using the DDIVAT (Digital Device Independent Visual Acuity Test) Turkish version and one using the standard Snellen chart. The study compares the agreement and test-retest reliability of these two methods. No intervention, medication, or treatment is applied.

Primary Outcome Measure

Agreement between DDIVAT (Turkish version) and Snellen chart visual acuity measurements [ Time Frame: During a single study visit (same day assessment) ]

Central Contacts

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