Assessment of the Validity, Reliability, and Feasibility of Two Smartphone Applications for Testing the Visual Acuity

Assessment of the Validity, Reliability, and Feasibility of Two Smartphone Applications for Testing the Visual Acuity

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.

Inclusion criteria:

• Age ≥10 years old

Exclusion criteria:

• Subjects who are not able to respond to the examiner