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.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
HEALTH_SERVICES_RESEARCH
Masking
SINGLE
Enrollment
120
The presenting visual acuity will be assessed using the Vision Screening module of the "Easy Vision" application.
The presenting visual acuity will be assessed using the Test Yourself module of the "Easy Vision" application.
The presenting visual acuity will be assessed using the "Peek Acuity" application.
The presenting visual acuity will be assessed using the conventional methods \["Chart: Tumbling E optotype" for assessing distance visual acuity and "Handheld chart: Tumbling E Near Point Vision Chart" for assessing near visual acuity\]
Ophthalmic Research Center, Shahid Beheshti University of Medical Sciences
Tehran, Iran
Distance visual acuity assessment with Easy Vision versus Peek Acuity versus conventional distance visual acuity chart
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)
Time frame: Through study completion [an average of 6 months]
Near visual acuity assessment with Easy Vision versus Peek Acuity versus conventional near visual acuity chart
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)
Time frame: Through study completion [an average of 6 months]
This platform is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional.