Visual Acuity Charts

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This app displays optically precise optotypes of eye charts for you to test nearsightedness or myopia accurately.

At exactly 6 meters away from the “patient”, the optotypes on the 6/6 line (Decimal 1.0 or LogMar 0.0) shall subtend 5 minutes of arc, which means that the chart should be sized such that these optotypes are 8.73mm tall, and the topmost (Snellen Fraction 6/60, Decimal 0.1, or LogMar 1.0) optotypes should be 87.3 mm tall. At exactly 20 feet away from the “patient”, the topmost optotypes should be 88.7 mm tall, because 20 feet equals 6.096 meters.

Supported Eye Charts:
1. Snellen Chart, with C, D, E, F, H, K, N, P, R, U V and Z, as defined in BS 4274-1:2003
2. Tumbling E Chart
3. Landolt C Chart
4. ETDRS Chart, with C, D, H, K, N, O, R, S, V, and Z
5. HOTV Chart
6. ETDRS European-wide Chart, with H, K, O, E, P, X, B, T, M and A
7. LEA Symbols for preschool-age children
8. Numbers

ETDRS chart with LogMAR notation is actually LogMAR chart.

Scenarios:
1. "Doctor" and "Patient".
2. Self-diagnosis with a mirror.
3. Self-diagnosis within arm's reach

Modes:
1. Autoplay
2. Manual

Predefined Test Distances:
* 6, 5, 4, 3, and 2 meters
* 20, 15, 12, 10, 6 feet

And an arm's reach distance may be defined in Settings.

Voice Hint is available for a "doctor" wearing a headphone when observing the responses from the "patient".

Disclaimer:
While this app may replace Snellen Chart, E-Chart, C-Chart, ETDRS Charts and HOTV Chart in print, it cannot replace doctors and optometrists who carry out comprehensive tests for your eyes. Please visit optometrists regularly and seek help from medical professional at early signs of visual acuity problems.

Hints:
You can test your visual acuity frequently with this app. For example, if you have young children to take care of, you may test their visual acuity monthly, fortnightly or weekly, so you can take preventive measures and seek help from medical professional early to prevent their visual acuity from getting worse.
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What's New

1. Setting to disable "Keep Screen On". By default, the app keeps screen on.
2. When using LogMAR notation, the scoring is (LogMAR value of the best line read) + 0.02 x (number of optotypes missed). LogMAR chart was developed at the National Vision Research Institute of Australia in 1976, and is designed to enable a more accurate estimate of acuity than do other charts, and is recommended, particularly in a research setting. In this app, EDTRS chart with LogMAR notation is actually LogMAR chart.
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Additional Information

Eligible for Family Library
Updated
December 17, 2018
Size
15M
Installs
1,000+
Current Version
1.3
Requires Android
4.2 and up
Content Rating
Everyone
Permissions
Offered By
Fonlow
Developer
Wakerley QLD 4154 Australia
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