Blindness, Vision Impairment
Conditions
Keywords
Visual acuity, Smartphone
Brief summary
Visual acuity (VA) is the most common measure of visual function globally. In clinical settings and during screening events, VA is an important measure to quantify changes in vision over time. Additionally, in the context of epidemiological studies and population-based surveys, VA is a critical measure to determine the presence and degree of vision impairment and to report on the indicators of effective eye care service coverage (i.e. refractive error and cataract surgery), that are currently considered by World Health Organization (WHO) for monitoring progress towards the Universal Health Coverage. There are numerous applications for assessing VA; however, the number of validated applications is limited. In this study, the investigators aim to evaluate the external validity, intra- and inter-observer reliability, and feasibility of two applications (Easy Vision and Peek Acuity) for testing the visual acuity.
Interventions
DEVICEAssessment of distance and near visual acuity using Vision Screening module of Easy Vision application
The presenting visual acuity will be assessed using the Vision Screening module of the Easy Vision application.
DEVICEAssessment of distance and near visual acuity using Test Yourself module of Easy Vision application
The presenting visual acuity will be assessed using the Test Yourself module of the Easy Vision application.
DEVICEAssessment of distance and near visual acuity using Peek Acuity application
The presenting visual acuity will be assessed using the Peek Acuity application.
OTHERAssessment of distance and near visual acuity using the conventional methods
The presenting visual acuity will be assessed using the conventional methods \[Chart: Tumbling E optotype for assessing distance visual acuity and Handheld chart: Tumbling E Near Point Vision Chart for assessing near visual acuity\]
Sponsors
Shahid Beheshti University of Medical Sciences
Study design
Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
HEALTH_SERVICES_RESEARCH
Masking
SINGLE (Outcomes Assessor)
Eligibility
Sex/Gender
ALL
Age
10 Years to No maximum
Healthy volunteers
Yes
Inclusion criteria
• Age ≥10 years old
Exclusion criteria
• Subjects who are not able to respond to the examiner
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Distance visual acuity assessment with Easy Vision versus Peek Acuity versus conventional distance visual acuity chart | Through study completion [an average of 6 months] | To assess the agreement between two smartphone-based evaluation of distance visual acuity (LogMAR unit) with Easy Vision and Peek Acuity and a conventional distance visual acuity chart (Tumbling E optotype) |
| Near visual acuity assessment with Easy Vision versus Peek Acuity versus conventional near visual acuity chart | Through study completion [an average of 6 months] | To assess the agreement between two smartphone-based evaluation of near visual acuity (LogMAR unit) with Easy Vision and Peek Acuity and a conventional near visual acuity chart (Handheld chart: Tumbling E Near Point Vision Chart) |
Countries
Iran
Outcome results
None listed