Prevention is better than cure. Designed for children older than 6, parents with young children, and general practitioners, this app displays optically precise optotypes of eye charts for you to measure distant visual acuity accurately in order to detect nearsightedness or myopia early, so you can take preventive measures and seek help from medical professional early to prevent pseudomyopia from progressing to myopia, or prevent nearsightedness from getting worse.
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. Option to have shorter middle arm. 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. Numbers
Predefined Test Distances: * 6, 5, 4, 3, and 2 meters * 20, 15, 12, 10, 6 feet
Scenarios: 1. "Doctor" and "Patient". 2. Self-diagnosis with a mirror. With one eye covered by an eye patch and holding the device near the shoulder, you stand in front of a typical bathroom mirror using the mirror mode of the app and having the device's screen facing the mirror. The actual test distance is 2 times of the distance between you and the mirror. 3. Self-diagnosis with a Bluetooth keyboard. After putting the device standing a few meters away on a table, you use the keyboard's direction keys to indicate what your read. 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. Auto-scoring 2. Manual
In Auto-scoring, the app calculates the score according to your swiping on the screen. For different types of eye charts, the swiping responding to the testee’s reading could be different. Please press the Question mark button on the screen for more details.
For LogMAR notation, the score is (LogMAR value of the best line read) + 0.02 x (number of optotypes missed). And the maximum missed is 3. For VAS notation, the score is an inversion of the logMAR scale, based on VAS=100-50xlogMAR. For other notations, the score is the notation value of the best line read and optionally minus number of optotypes missed, and the maximum missed is 2.
By default, setting "Play Interval Until Next Optotype" is none. Available intervals in second includes: 2, 4, 6, 8, and 10. If the "patient" could not recognize the optotype within the interval, this counts a miss.
Through enabling “Record Scores” in Settings, you can keep track of the progression of your visual acuity. Visual acuity scores of multiple testees could be recorded.
Visual Acuity Score (VAS) is an inversion of the logMAR scale, based on VAS=100-50xlogMAR. It is more intuitive since higher values indicate better visual acuity.
In the scores review, score 100 in blue indicates the reference standard, scores above 100 in green indicates no myopia, while scores below 100 in red may indicate myopia.
You may copy the scores of current testee to the device's clipboard, then you may paste the scores to a drafted Email message or instant message. This may be handy for telemedicine / telehealth session when the medical practitioner asks for VA scores.
Testing for myopia takes several procedures and the first step is often to check distant visual acuity through a visual acuity chart. And the decrement of visual acuity may indicate the development of myopia.
Disclaimer: While this app may replace eye charts in print, however 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.
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* Support iPhone SE 3rd Generation and iPad Air 5th Generation.
2.8
2021-10-26
1. Setting for displaying multiple optotypes of current row. 2. When multiple optotypes are enabled in current row, wipe left or right or press the Next button to shuffle optotypes. 3. In Auto Scoring mode, the testee should read the central optotype. 4. Supports iPad 9th generation and iPad Mini 6th generation.
2.5.2
2020-05-16
1. Bug fixed: The eyesight testing screens do not respond to swipe gestures on iPhone/iPad with iOS 13.4.1.
2.5.1
2020-05-04
1. Bug fixed: on iPhone when inputting Custom Distance, the value is not persisted. 2. Better display in iOS Dark Appearance.
2.3
2020-04-05
1. Option for optotype E of Tumbling E Chart to have shorter middle arm. 2. Startup notation at Decimal 0.2 or LogMar0.7 or VAS 65 or Fraction 6/30. 3. Support iPad Pro 12.9-inch 4th generation, iPad Pro 11-inch 2nd generation and iPad 10.2 inch 7th generation.
2.2.5
2020-04-02
Maintenance build.
2.2.3
2019-09-24
Support iPhone 11.
2.2.2
2019-08-14
1. On iPad, if "Record Scores" is enabled, the Scores button will appear in the toolbar, while on iPhone, a menu button appears in the toolbar for Scores, Settings and About. 2. Faster startup.
2.2.1
2019-07-09
1. Support latest iPad models released in 2019.
2.2
2019-05-17
1. Support self-diagnosis with a Bluetooth keyboard. With eye charts that use letters or numbers, you may press the respective letter keys or number keys to signal right responses. With Tumbling E Chart and Landolt C Chart, you may use arrow keys or QWEADZXC of the QWERTY keyboard layout to signal right responses, similar to the way of swiping the screen.
2. The textual content of this app had been translated into these languages from English: Spanish/Español (es) Italian/Italiano (it) Russian/русский (ru) Hindi/हिन्दी, हिंदी, (hi) Portuguese/Português (pt) Chinese Simplified/简体中文 (zh-Hans) Chinese Traditional/繁體中文 (zh-Hant) Japanese/日本語 (ja) Korean/한국어 (ko) Thai/ไทย (th) Indonesian/bahasa Indonesia (id)
2.1.1
2019-04-18
Bug fixed: After the app falls into sleep then wakes up, the help content in the default screen may become for Autoplay.
2.1
2019-04-15
Improved the hint and help system.
2.0.1
2019-04-04
1. Bug fixed: date in the scores was displayed as UTC date. It should be local date. 2. Through enabling “Record Scores” in Settings, you can keep track of the progression of your visual acuity. Visual acuity scores of multiple testees could be recorded. Visual Acuity Score (VAS) is an inversion of the logMAR scale, based on VAS=100-50xlogMAR. It is more intuitive since higher values indicate better visual acuity. 3. In the scores review, score 100 in blue indicates the reference standard, scores above 100 in green indicates no myopia, while scores below 100 in red may indicate myopia.
2.0
2018-11-29
Through enabling “Record Scores” in Settings, you can keep track of the progression of your visual acuity. Visual acuity scores of multiple testees could be recorded. Visual Acuity Score (VAS) is an inversion of the logMAR scale, based on VAS=100-50xlogMAR. It is more intuitive since higher values indicate better visual acuity.
In the scores review, score 100 in blue indicates the reference standard, scores above 100 in green indicates no myopia, while scores below 100 in red may indicate myopia.
1.5
2018-11-29
1. Short haptics vibration (for iPhone 6s or above) or short notification sound when current optotype is changed successfully, if the voice hint is off. This gives you feedback if you as a "doctor" is not looking at the screen but the response from the "patient".