Development and Validation of a Web-based Digital Distance Visual Acuity Test
Trial Snapshot
- Phase
- Not Applicable
- Enrollment
- 300
- Locations
- 2
- Primary Endpoint
- Distance visual acuity using DDVIT vision test
Study Overview
Brief Summary
Primary objective of this study is the development and validation of a web-based application for the examination of the distance visual acuity of normal- and low-vision patients.
Detailed Description
Present study aims to develop and validate a web-based digital distance visual acuity test (Democritus Distance Vision Test - DDVIT). DDVIT is an application, which will be easily accessed through a simple internet connection. This application will provide the possibility of a simple but reliable examination of patients, establishing a commonly accepted way of measuring the distance visual acuity among rural doctors, general practitioners and ophthalmologists.
Specifically, present study aims to develop a new online distance visual acuity test (DDVIT) according to the standards of the Early Treatment Diabetic Retinopathy Study (ETDRS) test and to evaluate the level of agreement between the two visual acuity tests, as well as the test-retest reliability of the online DDVIT visual acuity test.
The first part of the study is the development of the online visual acuity test (letters, numbers, symbols) including the following smart features:
- Adjustment of the font size according to the size of the computer screen used for the examination
- Real time calculation of the patient-screen distance through a face detection system
- Automatic calculation of the reading time of each line (each logMAR)
- Entering the number of patient's reading errors for each line
- Automatic calculation of the visual acuity in the following score units:
- Number of Letters (max 85)
- Visual Acuity Score (max 100)
- logMAR
- Decimal
- Snellen Fraction
Study Design
- Study Type
- Observational
- Observational Model
- Cohort
- Time Perspective
- Prospective
Eligibility Criteria
- Ages
- 18 Years to 75 Years (Adult, Older Adult)
- Sex
- All
- Accepts Healthy Volunteers
- No
Inclusion Criteria
- •Patients of our outpatient ophthalmology clinic
- •Age between 18 to 75 years
Exclusion Criteria
- •Attention-deficiency
- •Former diagnosis of mental and/or psychiatric diseases
- •Inability to cooperate
Outcomes
Primary Outcomes
Distance visual acuity using DDVIT vision test
Time Frame: 4 months
The distance visual acuity of the one randomly selected eye of each participant will be evaluated by the examiner using DDVIT vision test.
Distance visual acuity using ETDRS vision test
Time Frame: 4 months
The distance visual acuity of the same eye of each participant will be evaluated by the same examiner using the web-based ETDRS vision test under the same predetermined environmental lighting conditions.
Secondary Outcomes
No secondary outcomes reported
Investigators
Georgios Labiris
Professor (Associate) of Democritus University of Thrace
Democritus University of Thrace