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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.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Visual acuity assessment using "Vision Screening module" of "Easy Vision" application | Experimental |
| |
| Visual acuity assessment using "Test Yourself module" of "Easy Vision" application | Experimental |
| |
| Visual acuity assessment using "Peek Acuity" application | Experimental |
| |
| Visual acuity assessment using the conventional methods | Other |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Assessment of distance and near visual acuity using "Vision Screening module" of "Easy Vision" application | Device | The presenting visual acuity will be assessed using the Vision Screening module of the "Easy Vision" application. |
| 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] |
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Inclusion criteria:
• Age ≥10 years old
Exclusion criteria:
• Subjects who are not able to respond to the examiner
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| Ophthalmic Research Center, Shahid Beheshti University of Medical Sciences | Tehran | Iran |
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| Assessment of distance and near visual acuity using "Test Yourself module" of "Easy Vision" application | Device | The presenting visual acuity will be assessed using the Test Yourself module of the "Easy Vision" application. |
|
| Assessment of distance and near visual acuity using "Peek Acuity" application | Device | The presenting visual acuity will be assessed using the "Peek Acuity" application. |
|
| Assessment of distance and near visual acuity using the conventional methods | Other | 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] |
|
| ID | Term |
|---|---|
| D014786 | Vision Disorders |
| D001766 | Blindness |
| ID | Term |
|---|---|
| D012678 | Sensation Disorders |
| D009461 | Neurologic Manifestations |
| D009422 | Nervous System Diseases |
| D005128 | Eye Diseases |
| D012816 | Signs and Symptoms |
| D013568 | Pathological Conditions, Signs and Symptoms |
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