Near and Far vs Visual Acuity Charts Utilisation & Stats

Near and Far is a simple near and distance visual acuity screening tool for near and distance visual acuity for iPad™. The distance (far) test is based on a traditional Snellen chart. The distance test optotypes are of the Sloan type and are limited to the letters specified in the British Standard BS 4274-1:2003. They are designed to be read at 6 meters or 20 feet, but can be reversed for use with a mirror at 3 meters or 10 feet if necessary by left or right swiping the screen. To toggle between 3 meters and 20 feet, tap on the size indicator on the lower right of the far test screen. The letter combinations can be randomized by tapping on them. Potentially offensive letter combinations are filtered out. The near vision test uses the N type chart and features three sets of text which can be cycled by tapping on the text. Either Helvetica or Times New Roman font can be displayed. The test screens have been designed with minimal visible controls. There are no visible controls on the Near screen, and only "Smaller", "Larger" and Size controls on the "Far" screen. To return to the app home screen from any screens you swipe down. Due to the size requirements for the text, Near and Far is an iPad only app. It is necessary to manually calibrate the app via the "Calibrate" screen, before the "Near" and "Far" buttons are enabled. Calibration is necessary due to variations in scaling for the various existing iPad models as well as unknown future models. Calibration is performed by measuring a test line on the calibration screen. All features are enabled on the standard version. There are no In App Purchases and no advertisements. Warning: Vision testing and diagnosis of vision disorders should be performed by appropriately qualified health professionals in an appropriate environment. It is the responsibility of the user of this app to ensure that it is correctly calibrated and suitable for the intended use.

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Visual Acuity Charts

Prevention is better than cure. Designed for children older than 6, parents with young children, and general practitioners, this eyechart app displays optically precise optotypes of eye charts for you to measure distance vision accurately in order to detect 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, 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 ft. 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. 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 In Auto scoring, you use the swiping gestures to indicate correct readings or wrong readings, and the app calculates the score. 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 Testing for Telehealth Using Mobile Applications” published in JAMA Ophthalmology on https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7809609/ indicates Visual Acuity Charts is the most accurate among 10 eyechart apps on iPhones being tested. Checking for myopia takes several procedures and the first step is often to test 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 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.