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

Study Overview
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Brief Summary
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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.

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

Conditions
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Vision Impairment, Blindness

Intervention / Treatment
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* Device: Assessment of distance and near visual acuity using Vision Screening module of Easy Vision application
* Device: Assessment of distance and near visual acuity using Test Yourself module of Easy Vision application
* Device: Assessment of distance and near visual acuity using Peek Acuity application
* Other: Assessment of distance and near visual acuity using the conventional methods


Participation Criteria
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Eligibility Criteria
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Inclusion criteria: • Age ≥10 years old Exclusion criteria: • Subjects who are not able to respond to the examiner

Ages Eligible for Study
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Minimum Age: 10 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Health Services Research
Allocation: Randomized
Intervention Model: Crossover Assignment
Masking: Single


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Visual acuity assessment using Vision Screening module of Easy Vision application<br> | Device: Assessment of distance and near visual acuity using Vision Screening module of Easy Vision application<br>* The presenting visual acuity will be assessed using the Vision Screening module of the Easy Vision application.<br>|
| Experimental: Visual acuity assessment using Test Yourself module of Easy Vision application<br> | Device: Assessment of distance and near visual acuity using Test Yourself module of Easy Vision application<br>* The presenting visual acuity will be assessed using the Test Yourself module of the Easy Vision application.<br>|
| Experimental: Visual acuity assessment using Peek Acuity application<br> | Device: Assessment of distance and near visual acuity using Peek Acuity application<br>* The presenting visual acuity will be assessed using the Peek Acuity application.<br>|
| Other: Visual acuity assessment using the conventional methods<br> | Other: Assessment of distance and near visual acuity using the conventional methods<br>* 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]<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| 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) | 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) | Through study completion [an average of 6 months] | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Visual acuity, Smartphone