Validation of DDIVAT Digital Optotypes for Distance Visual Acuity Testing Among the Bulgarian Population

To compare distance visual acuity in Bulgarian patients over 18 years of age using two different methods - the Snellen method and the DIDIVAT digital online optotypes. For the purpose of this study, it is planned to examine native visual acuity (with and without prescribed optical correction), without additional mydriasis in both ways, of 150 Bulgarian patients (75 women and 75 men) over 18 years of age, hospitalized in a university eye clinic at St. George University Hospital and healthy volunteers willing to participate in the study. The statistical analysis that will be performed will aim to compare whether the two methods for determining distance visual acuity are identical in results, as well as to validate the application for the Bulgarian population.The study is expected to prove that the distance visual acuity of patients examined by both methods is identical.

NCT Number	NCT07208838
Lead Sponsor	Plovdiv Medical University Collaborators: Democritus University of Thrace
Conditions	Vision Screening
Enrollment	150 participants
Start Date	2025-10-01
Primary Completion	2026-07-01 (estimated)
Study Completion	2026-07-01 (estimated)
Updated on ClinicalTrials.gov	2025-10-06