Visual Acuity Charts

Prevention is best than remedy. Designed for kids older than 6, dad and mom with younger youngsters, and basic practitioners, this app displays optically precise optotypes of eye charts so that you can measure distant visual acuity accurately to have the ability to detect nearsightedness or myopia early, so you'll be able to take preventive measures and seek assist from medical professional early to prevent pseudomyopia from turning into myopia, or stop 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 center 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 a couple of meters

* 20, 15, 12, 10, 6 feet

Scenarios:

1. Doctor and Patient.

2. Self-diagnosis with a mirror. With one eye lined by a watch patch and holding the device close to the shoulder, you stand in entrance of a typical bathroom mirror using the mirror mode of the app and having the device's display 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 number of meters away on a desk, you utilize the keyboard's path keys to indicate what your learn.

4. Self-diagnosis inside arm's attain.

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

In Autoplay, the app calculates the rating. For LogMAR notation, the rating is (LogMAR value of the most effective line read) 0.02 x (number of optotypes missed). And the maximum missed is 3. For VAS notation, the rating is an inversion of the logMAR scale, primarily based on VAS=100-50xlogMAR. For other notations, the rating is the notation value of one of the best line read and optionally minus variety of optotypes missed, and the maximum missed is 2.

By default, setting Play Interval Until Next Optotype is none. Available intervals in second contains: 2, 4, 6, 8, and 10. If the patient couldn't acknowledge the optotype within the interval, this counts a miss.

Through enabling “Record Scores” in Settings, you'll be able to keep observe of the progression of your visual acuity. Visual acuity scores of a number of testees might be recorded.

Visual Acuity Score (VAS) is an inversion of the logMAR scale, based mostly on VAS=100-50xlogMAR. It is extra intuitive since greater values indicate better visual acuity.

In the scores evaluation, score 100 in blue indicates the reference normal, scores above 100 in inexperienced signifies no myopia, whereas scores below one hundred in pink could point out myopia.

You may copy the scores of present affected person to the system's clipboard, then you might paste the scores to a drafted Email message or instant message. This could additionally be handy for telemedicine / telehealth session when the medical practitioner asks for VA scores.

Testing for myopia takes a quantity of procedures and step one is commonly to check distant visual acuity via a visible acuity chart. And the decrement of visible acuity could point out the development of myopia.

Disclaimer:

While this app may replace eye charts in print, however it can not replace medical doctors and optometrists who perform comprehensive checks in your eyes. Please visit optometrists regularly and search help from medical skilled at early signs of visible acuity issues.