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.

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.