About & Pics

Description

Prevention is better than cure, while myopia is incurable. 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 detect nearsightedness or myopia accurately and early.

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

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

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.

Scenarios:
1. "Doctor" and "Patient".
2. Self-diagnosis with a mirror.
3. 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)

All charts in any VA notation follow the LogMAR design recommended by the International Council of Ophthalmology (ICO) to address design flaws in original Snellen chart.

Test Modes:
1. Autoplay
2. Manual

In Autoplay, the app calculates the score. 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: 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.

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:
Rather than taking eye exams annually, you can check 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 pseudomyopia from becoming myopia, or prevent nearsightedness from getting worse.

 Free in Google Play

Screenshots

Visual Acuity Charts - Detect Myopia screenshot 1Visual Acuity Charts - Detect Myopia screenshot 2Visual Acuity Charts - Detect Myopia screenshot 3Visual Acuity Charts - Detect Myopia screenshot 4Visual Acuity Charts - Detect Myopia screenshot 5Visual Acuity Charts - Detect Myopia screenshot 6Visual Acuity Charts - Detect Myopia screenshot 7Visual Acuity Charts - Detect Myopia screenshot 8Visual Acuity Charts - Detect Myopia screenshot 9Visual Acuity Charts - Detect Myopia screenshot 10Visual Acuity Charts - Detect Myopia screenshot 11Visual Acuity Charts - Detect Myopia screenshot 12Visual Acuity Charts - Detect Myopia screenshot 13Visual Acuity Charts - Detect Myopia screenshot 14

Version History

Launched Oct 07, 2018 (7 months ago).

Releasing new versions every 10 days, on average.

Apr 15
2019
(Current)
Version 2.1.1

Bug fixed: After the app falls into sleep then wakes up, the help content in the default screen may become for Autoplay.

Apr 13
2019
Version 2.1

Improved the hint and help system.

Apr 02
2019
Version 2.0.1

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 may indicate myopia.

Mar 28
2019
Version 2.0

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 may indicate myopia.

Feb 25
2019
Version 1.5

1. Short haptics vibration 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". This applies to all eye charts.

Jan 26
2019
Version 1.3.4

1. With notation VAS, the score is calculated as 100 - 50 x logMAR.
2. The app has its own optional brightness setting independent of the device's brightness setting. When a chart is viewed from a distance over 2 meters, it is reasonable to make the brightness of the app screen be brighter than the default device brightness which is generally for arm's reach distance.

Jan 24
2019
Version 1.3.2

1. With notation VAS, the score is calculated as 100 - 50 x logMAR.
2. The app has its own brightness setting independent of the device's brightness setting. When a chart is viewed from a distance over 2 meters, it is reasonable to make the brightness of the app screen be brighter than the default device brightness which is generally for arm's reach distance.

Jan 03
2019
Version 1.3.1

Support more VA notations: Fraction (5/10) based on 5 meters. MAR and VAS/VAR.

Dec 16
2018
Version 1.3

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.

Dec 14
2018
Version 1.2.6

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.

Nov 22
2018
Version 1.2.5

1. In About, display device make and model.
2. Show basic hint up to 3 times for new user.

Nov 05
2018
Version 1.2.3

Support LEA Symbols and LEA Numbers.

Nov 02
2018
Version 1.2.2

Support Modified ETDRS Chart for European-wide Use.

Oct 29
2018
Version 1.2

Support the variants of Snellen Chart: Sloan Chart and HOTV Chart

Oct 27
2018
Version 1.1.2

Improve randomization of generated optotypes, so the first optotype is always different from the last one in the upper row.

Oct 23
2018
Version 1.1.1

1. Bug fixed: the mirror mode in Snellen Chart interrupts the auto play of the other charts.

Oct 22
2018
Version 1.1

1. Auto play to calculate visual acuity score when the “doctor” is mimicking the response of the “patient” through swiping the touch screen. At the end of the test, the device will vibrate and the result is popping up.

2. In free mode or during the pause of auto play, swipe up to move to upper row with larger optotypes, or swipe down to lower row with small optotype; wipe left to move to prior optotype in the same row, and swipe right to next optotype in the same row.

Oct 13
2018
Version 1.0.3

Oct 09
2018
Version 1.0.1

This app reassembles Snellen Chart, Tumbling E Chart and Landolt C Chart traditionally in print through generating optotypes at exact physical sizes according to the test distance in metric units or imperial units.

To help you to detect early symptoms of nearsightedness or myopia, this app supports 3 modes:
1. "Doctor" and "Patient"
2. Self-diagnosis with a mirror
3. Self-diagnosis within arm's reach

Oct 07
2018
Version 1.0

This app reassembles Snellen Chart, Tumbling E Chart and Landolt C Chart traditionally in print through generating optotypes at exact physical sizes according to the test distance. You may even test your own visual acuity by yourself using the mirror mode of this app.

To help you to detect early symptoms of nearsightedness or myopia, this app supports 3 modes:
1. "Doctor" and "Patient"
2. Self-diagnosis with a mirror
3. Self-diagnosis within arm's reach

Previous 3 versions
20

Total Ratings

5
15
4
0
3
2
2
1
1
2
41

Total Ratings

5
33
4
2
3
2
2
1
1
3