Eye Charts Description

Designed for children older than 6, parents with young children, and general practitioners, this eyechart 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 myopia or stop nearsightedness from deteriorating further.

Supported Eye Charts:
1. Snellen, with C, D, E, F, H, K, N, P, R, U V and Z, as defined in BS 4274-1:2003.
2. Tumbling E. Option to have shorter middle arm.
3. Landolt C.
4. ETDRS, with C, D, H, K, N, O, R, S, V, and Z.
5. European-wide, with H, K, O, E, P, X, B, T, M and A.
6. HOTV.
7. Numbers.
8. Shapes.

Test Distances:
* 6, 5, 4, 3, and 2 meters predefined
* 20, 15, 12, 10, 6 feet predefined
* Custom distance 0.5 - 30 meters, or 1.6 - 98 feet.

Scenarios:
1. "Doctor" and "Patient".
2. Self-diagnosis with a mirror – Stand in front of a mirror using the app in mirror mode with an eye patch covering one eye. The actual test distance is twice the distance between you and the mirror.
3. Self-diagnosis with a Bluetooth keyboard – Place the device at a few meters’ distance on a table, using keyboard arrow keys to indicate what you read.

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. Manual.
2. Auto scoring – Swipe gestures indicate correct or incorrect readings, and the app calculates scores. Enable "Record Scores" in settings to track visual acuity progression, with support for multiple test subjects.

According to “Visual Acuity Testing for Telehealth Using Mobile Applications” published in JAMA Ophthalmology on https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7809609/ , Visual Acuity Charts demonstrated the highest accuracy among 10 iPhone-based visual acuity chart applications.

Myopia detection requires several steps, and distant visual acuity testing is often the first. A decline in visual acuity may signal myopia development, enabling early intervention.

Disclaimer:
While this app may replace eye charts in print, however it CANNOT replace doctors and optometrists who carry out comprehensive eye exam for your basic eye health. The eye chart app does not test strabismus, esotropia, exotropia, hyperopia and astigmatism and which are common early vision conditions. Please visit optometrists regularly and seek help from medical professional at early signs of visual acuity problems.

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Is Eye Charts safe for my device?

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Yes, Eye Charts follows the Google Play content guidelines to ensure safe use on your Android device.

What is an XAPK file, and what should I do if the Eye Charts I downloaded is an XAPK file?

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A file with .xapk extension is a compressed package file. It is a container file format that incorporates APK and additional associated files required for the installation. The XAPK format was introduced to package the APK file and OBB file together for a seamless delivery and installation process. XAPK format can help reduce the package size of application. On mobile phones, users need to install the XAPK installer first, and then install XAPK files through that installer. You can find the installer here:https://apkcombo.com/how-to-install/. But on PC client, you just need to put the file on LDPlayer.

Can I play Eye Charts on my computer?

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Yes, you can play Eye Charts on your computer by installing LDPlayer, an Android emulator. After installing LDPlayer, simply drag and drop the downloaded APK file into the emulator to start playing Eye Charts on PC. Alternatively, you can open the emulator, search for the game or app you want to play, and install it from there.