Snellen Chart is a medical app developed by Fonlow.
Download Statistics
Snellen Chart has been downloaded 25 thousand times. In the last 30 days, the app was downloaded 530 times.
User Ratings
Snellen Chart is rated 4.33 out of 5 stars. The rating is based on 37 ratings.
App Information
Snellen Chart is FREE to download. The APK download size is 32.65 MB. The latest version available is 2.7.1. The last update was on March 27, 2026.
Technical Requirements
Snellen Chart requires Android 5.0+ or higher. The app has a content rating of Everyone. The app has been available on Google Play October 2019.
Description
Designed for children over the age of 6, parents with young children, and general practitioners, this eye chart app displays optically precise optotypes for accurate distance vision measurement. Early detection of myopia allows you to take preventive action, seek medical advice promptly, and prevent pseudomyopia from worsening into true myopia or stop nearsightedness from deteriorating further.
Predefined Test Distances: * 6, 5, 4, 3, and 2 meters * 20, 15, 12, 10, and 6 feet
Scenarios: 1. Doctor and patient 2. Self-diagnosis using a mirror 3. Self-diagnosis using a Bluetooth keyboard 4. Self-diagnosis within arm's reach
Notations: 1. Decimal (0.50) 2. Fraction (20/40) 3. LogMAR (0.30) 4. Fraction (5/10) 5. Fraction (6/12) 6. MAR (2) 7. VAS or VAR (85)
Test Modes: 1. Autoplay 2. Manual
By enabling “Record Scores” in Settings, you can track the progression of your visual acuity. Visual acuity scores for multiple test subjects can be recorded. The Visual Acuity Score (VAS) is an inversion of the LogMAR scale, calculated as VAS = 100 − 50 × LogMAR. It is more intuitive, as higher values indicate better visual acuity.
In the score review: - A score of 100 in blue indicates the reference standard - Scores above 100 in green indicate no myopia - Scores below 100 in red may indicate myopia
Myopia detection involves several steps, with distance visual acuity testing often being the first. A decline in visual acuity may indicate the onset of myopia, enabling early intervention.
Disclaimer: While this app may replace printed eye charts, it CANNOT replace doctors or optometrists who perform comprehensive eye exams essential for maintaining eye health. The app does not test for strabismus, esotropia, exotropia, hyperopia, or astigmatism—common early vision conditions. Please consult an optometrist regularly and seek professional medical advice at the first signs of visual acuity issues.
Recent changes: 1. Support 16KB Memory Page Sizes. 2. arm64-v8a only. 3. Adjust the privacy policy to clearly state the data usage.
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Looks like it will be good... But swiping causes my phone to exit. Having arrows on screen makes more sense. Using gestures causes complications. Also, how far away from someone's face should the phone be?
★★★★☆Pulkit Sharma· Jul 27, 2022
Nice app to vision acuity test at home. But you have to knowledge about 6/6 6/9, 20/40 20/20 etc. etc
★★★★★Otie Brown· Sep 22, 2025
I do myopia prevention. Having an easy to use Snellen, is critical to get out of myopia.
Google Play Rankings for Snellen Chart
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Technologies used by Snellen Chart
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