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121<h1>Fonlow Eye Charts</h1>
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133    <h2>Measure Distant Visual Acuity to Detect Early Signs of Myopia</h2><p>Eye Charts is designed for children aged 6 and above, parents with young children, and general practitioners. It features optically accurate optotypes that enable precise measurement of distance vision. By detecting nearsightedness or myopia early, users can take&nbsp;<a href="https://visualacuity.info/Resources" target="_self">preventive measures</a>&nbsp;and seek medical assistance early to prevent pseudomyopia from developing into myopia or worsening existing nearsightedness.</p><h3 style="color: rgba(33, 37, 41, 1)">Charts</h3><ol><li><a href="https://en.wikipedia.org/wiki/Snellen_chart" target="_blank" style="color: rgba(13, 110, 253, 1)">Snellen Chart</a>, with C, D,&nbsp;<a href="https://visualacuity.info/Media/Default/Misc/E.png" target="_blank" style="color: rgba(13, 110, 253, 1)">E</a>, F, H,&nbsp;<a href="https://visualacuity.info/Media/Default/Misc/K.png" target="_blank" style="color: rgba(13, 110, 253, 1)">K</a>, N, P, R, U V and Z, as defined in&nbsp;<a href="https://books.google.com.au/books?id=-9ftET_IDkYC&amp;pg=PA97&amp;lpg=PA97&amp;dq=BS+4274-1:2003&amp;source=bl&amp;ots=Hv-lZXgzIJ&amp;sig=ACfU3U325AAzWn6HXgaug6_BSc6HoCTu5g&amp;hl=en&amp;sa=X&amp;ved=2ahUKEwifm7D8u_DjAhUFdCsKHdxfDjUQ6AEwEnoECAkQAQ#v=onepage&amp;q=BS%204274-1%3A2003&amp;f=false" target="_blank" style="color: rgba(13, 110, 253, 1)">BS 4274-1:2003</a></li><li><a href="https://en.wikipedia.org/wiki/E_chart" target="_blank" style="color: rgba(13, 110, 253, 1)">Tumbling E Chart</a>.</li><li><a href="https://en.wikipedia.org/wiki/Landolt_C" target="_blank" style="color: rgba(13, 110, 253, 1)">Landolt C Chart</a></li><li><a href="https://en.wikipedia.org/wiki/LogMAR_chart" style="color: rgba(13, 110, 253, 1)">ETDRS Chart</a>, with the Sloan letters C, D, H, K, N, O, R,&nbsp;<a href="https://visualacuity.info/Media/Default/Misc/S.png" target="_blank" style="color: rgba(13, 110, 253, 1)">S</a>, V, and Z</li><li>HOTV Chart</li><li>ETDRS European-wide Chart, with the Sloan letters H, K,&nbsp;<a href="https://visualacuity.info/Media/Default/Misc/O.png" target="_blank" style="color: rgba(13, 110, 253, 1)">O</a>, E, P, X, B, T, M and A, common to all three European alphabets (Latin, Greek, Cyrillic)</li><li><a href="https://visualacuity.info/Media/Default/Misc/8.png" target="_blank" style="color: rgba(13, 110, 253, 1)">Numbers</a></li><li>Shapes</li></ol>
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135<video width="300" controls="">
136    <source src="https://visualacuity.info/media/default/video/AppPreviewBasic.mp4" type="video/mp4">
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140    <source src="https://visualacuity.info/media/default/video/AppPreviewPlay.mp4" type="video/mp4">
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145    <source src="https://visualacuity.info/media/default/video/AppPreviewPlayMirror.mp4" type="video/mp4">
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149<p><a href="https://play.google.com/store/apps/details?id=com.fonlow.VAC" target="_blank"><img alt="Get it on Google Play" src="https://play.google.com/intl/en_us/badges/images/badge_new.png"></a></p>
150<p><a href="https://apps.apple.com/au/app/visual-acuity-charts/id1442509969?ign-itscg=30200&amp;ign-itsct=apps_box_badge" target="_blank" style="display: inline-block; overflow: hidden; border-radius: 13px; width: 125px; height: 41.5px"><img src="https://tools.applemediaservices.com/api/badges/download-on-the-app-store/black/en-us?size=125x41.5&amp;releaseDate=1543449600" alt="Download on the App Store" style="border-radius: 13px; width: 125px; height: 41.5px"></a>
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152</p><p>Content rating: 3+ with&nbsp;<a href="https://web.iarcservices.com/Dashboard/Certificate/9fae6c58-bd62-45cf-ad3d-68a05719bd75">IARC Rating Certificate</a></p>
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162    <h2>Scenarios</h2><ol><li><a href="/doctor-and-patient"><b>"Doctor" and "Patient"</b></a></li><li><a href="/Self-diagnosis"><b>Self-diagnosis with Mirror</b></a>, convenient for <a href="telemedicine" target="_self"><b>telemedicine/telehealth</b></a> when the patient is alone with a mirror on a wall.</li><li><a href="/bluetooth-keyboard"><b>Self-diagnosis with a Bluetooth keyboard</b></a>,&nbsp;convenient for telemedicine/telehealth when the patient is alone with a keyboard connected to the mobile device.</li><li><a href="/self-diagnosis-within-arm-s-reach"><b>Self-diagnosis within Arm's Reach</b></a></li></ol><p> <img src="/media/default/Gallery/DadAndSonEtdrsChart.png"><br></p><h2 style="color: rgba(0, 0, 0, 1); font-family: Verdana, Arial, Helvetica, sans-serif">Predefined Test Distances</h2><ul><li>6, 5, 4, 3, and 2 meters</li><li>20, 15, 12, 10, and 6 feet</li></ul><p>And&nbsp;a custom distance between 0.5m and 30m may be defined in <a href="settings-explained" title="Settings Explained"><strong>Settings</strong></a>.</p><p><strong>Remarks</strong></p><ul><li><p dir="ltr">Custom distance is handy for an arm-reach distance, ad-hoc distance in a GP's office, and a very long distance up to 30 meters for testing the eyesight of a top gun pilot.<br></p></li><li>The letters&nbsp;and&nbsp;orientations of E or C ring are randomly shuffled.&nbsp;This makes&nbsp;<a href="https://deadspin.com/that-time-chris-paul-memorized-an-eye-chart-to-try-and-1789074171" target="_blank">memorizing an eye chart and cheating a vision test</a>&nbsp;impossible.</li></ul><h3 style="color: rgba(0, 0, 0, 1); font-family: Verdana, Arial, Helvetica, sans-serif">Notations</h3><ol><li>Decimal (0.50)</li><li>Fraction (20/40)</li><li>LogMAR (0.30)</li><li>Fraction (5/10)</li><li>Fraction (6/12)</li><li>MAR (2)</li><li>VAS or VAR (85)</li></ol><p>All charts in any VA notation follow the&nbsp;<a href="http://www.icoph.org/dynamic/attachments/resources/icovisualacuity1984.pdf" target="_blank">LogMAR design recommended</a>&nbsp;by the&nbsp;<a href="https://www.icoph.org/" target="_blank">International Council of Ophthalmology</a>&nbsp;(ICO) and&nbsp;<a href="https://books.google.com.au/books?id=-9ftET_IDkYC&amp;pg=PA97&amp;lpg=PA97&amp;dq=BS+4274-1:2003&amp;source=bl&amp;ots=Hv-lZXgzIJ&amp;sig=ACfU3U325AAzWn6HXgaug6_BSc6HoCTu5g&amp;hl=en&amp;sa=X&amp;
162ved=2ahUKEwifm7D8u_DjAhUFdCsKHdxfDjUQ6AEwEnoECAkQAQ#v=onepage&amp;q=BS%204274-1%3A2003&amp;f=false" target="_blank">BS 4274-1:2003</a>&nbsp;to address design flaws in original Snellen chart.&nbsp;</p><h3 style="color: rgba(0, 0, 0, 1); font-family: Verdana, Arial, Helvetica, sans-serif">Modes</h3><ol><li><a href="auto-scoring"><strong>Auto-scoring</strong></a></li><li>Manual</li></ol><p><strong>Remarks:</strong></p><p>Testing for&nbsp;<a href="https://eyewiki.aao.org/Myopia">myopia</a>&nbsp;takes several procedures and the first step is often to check distant&nbsp;<a href="https://en.wikipedia.org/wiki/Visual_acuity">visual acuity</a>&nbsp;through a visual acuity chart. And the decrement of visual acuity may indicate the development of myopia.</p><p>Prevention is better than cure.&nbsp;According to&nbsp;<a href="https://www.aao.org/eye-health/diseases/myopia-nearsightedness">American Academy of Ophthalmology</a>, “<em>A great first step to prevent or slow the progression of nearsightedness is to encourage your child to spend more time outdoors</em>”, while “<a href="https://iovs.arvojournals.org/article.aspx?articleid=2466239">Light Exposure and Eye Growth in Childhood</a>” published in investigative ophthalmology &amp; visual science “<em>provides the first evidence of a modest but statistically significant relationship between objectively measured daily ambient light exposure and eye growth in children, consistent with more light exposure resulting in slower axial growth of the eye. These findings indicate a role for ambient light exposure in the previously documented association between outdoor activity and myopia and provide evidence to support interventions aimed at increasing daily light exposure in order to slow childhood myopia progression</em>”.&nbsp;</p><p></p><h2>Disclaimer</h2>
163While this app presents optically precise optotypes and may serve as a replacement for printed charts such as the Snellen, Tumbling E, Landolt C, ETDRS, and HOTV charts, it cannot replace doctors and optometrists who perform comprehensive <a href="https://myvision.org/eye-health/eye-exams/" target="_self">eye examinations</a> to assess overall eye health. Please visit an optometrist regularly and seek help from a medical professional at the earliest signs of visual acuity problems.<p></p><p><strong></strong>
164</p><p>This app does not test for strabismus, amblyopia, esotropia, exotropia, hyperopia, or astigmatism—common vision conditions that require clinical evaluation and diagnosis.</p><h3 style="color: rgba(0, 0, 0, 1); font-family: Verdana, Arial, Helvetica, sans-serif">Featured in:</h3><ul><li><a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7809609/">Visual Acuity Testing for Telehealth Using Mobile Applications</a>&nbsp; (<a href="https://europepmc.org/article/pmc/pmc7809609">europepmc.org mirror</a>) published in JAMA Ophthalmology validated that Eye Charts — formerly known as Visual Acuity Charts — is sufficiently accurate for clinical use.<br></li><li><a href="https://www.orthoptics.org.au/public/39/files/Telehealth%20Resources%20for%20Clinicians%20V3.pdf" target="_blank">Orthoptics Australia --&nbsp;Telehealth Resources: Testing Vision &amp; Eye Movements</a></li><li><a href="https://www.ajo.com/article/S0002-9394(20)30426-8/fulltext" target="_blank">American Journal of Ophthalmology -- Teleophthalmology: Evaluation of Phone-based Visual Acuity in a Pediatric Population</a></li><li><a href="https://www.aao.org/Assets/02dfcf41-49ae-4db7-b2dc-72e06250764f/637244819552230000/the-ease-of-implementing-telemedicine-into-your-practice-pdf" style="color: rgb(13, 110, 253);">The Ease of Implementing Telemedicine into Your Practice</a>&nbsp;by American Academy of Ophthalmology</li><li><a href="https://www.researchgate.net/publication/371952697_A_novel_smartphone_App_to_support_the_clinical_practice_of_pediatric_ophthalmology_and_strabismus_the_validation_of_visual_acuity_tests" style="color: rgb(13, 110, 253);">A novel smartphone App to support the clinical practice of pediatric ophthalmology and strabismus: the validation of visual acuity tests</a>&nbsp;(European Journal of Pediatrics)&nbsp;<a href="https://assets.researchsquare.com/files/rs-2608632/v1/4f6bfbe8-d255-4be0-89e7-6177d509251b.pdf" style="color: rgb(13, 110, 253);">PDF</a>.</li><li><a href="https://www.youtube.com/watch?v=Clp_axzAfeQ" target="_blank">UPMC Children's Hospital of Pittsburgh</a></li><li><a href="https://johnsoncityeye.com/tele-health/mobile/" target="_blank">JohnSon City Eye Clinic</a></li><li><a href="more-mentioned-by">More ...</a></li></ul>
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173<div class="field field-type-htmlfield field-name-paragraph-content">
174    <h2>Tips</h2>
175<ol>
176<li><a href="guidelines"><b>Guidelines</b></a></li>
177<li><a href="for-children-and-young-adults"><b>Testing for Children and Young Adults</b></a></li>
178<li><a href="Resources"><b>Eye Care Resources</b></a></li>
179<li><a href="faq"><b>FAQ</b></a></li>
180</ol>
181<h2>Device Gallery</h2><p>
181This app has been tested on various Android phones/tablets, iPhones and iPads to ensure optotypes are displayed on mobile screens accurately. And the localization includes <a href="https://play.google.com/store/apps/details?id=com.fonlow.VAC&amp;hl=es">Spanish</a>/<a href="https://apps.apple.com/es/app/visual-acuity-charts/id1442509969">español</a>, <a href="https://play.google.com/store/apps/details?id=com.fonlow.VAC&amp;hl=HI">Hindi</a>/मानक हिन्दी, <a href="https://play.google.com/store/apps/details?id=com.fonlow.VAC&amp;hl=it">Italian</a>/<a href="https://apps.apple.com/it/app/visual-acuity-charts/id1442509969">italiano</a>, <a href="https://play.google.com/store/apps/details?id=com.fonlow.VAC&amp;hl=ja">Japanese</a>/<a href="https://apps.apple.com/jp/app/visual-acuity-charts/id1442509969">日本語</a>, <a href="https://play.google.com/store/apps/details?id=com.fonlow.VAC&amp;hl=ko">Korean</a>/<a href="https://apps.apple.com/kr/app/visual-acuity-charts/id1442509969">한국어</a>, <a href="https://play.google.com/store/apps/details?id=com.fonlow.VAC&amp;hl=pt">Portuguese</a>/<a href="https://apps.apple.com/pt/app/visual-acuity-charts/id1442509969">português</a>, <a href="https://play.google.com/store/apps/details?id=com.fonlow.VAC&amp;hl=ru">Russian</a>/<a href="https://apps.apple.com/ru/app/visual-acuity-charts/id1442509969">русский язык</a>, <a href="https://play.google.com/store/apps/details?id=com.fonlow.VAC&amp;hl=th">Thai</a>/ภาษาไทย, <a href="https://play.google.com/store/apps/details?id=com.fonlow.VAC&amp;hl=zh">Simplified Chinese</a>/&nbsp;<a href="https://apps.apple.com/tw/app/visual-acuity-charts/id1442509969">简体</a> and <a href="https://play.google.com/store/apps/details?id=com.fonlow.VAC&amp;hl=zh-hant">Traditional Chinese</a>/&nbsp;<a href="https://apps.apple.com/hk/app/visual-acuity-charts/id1442509969">繁體</a>.&nbsp;</p><h3>iOS</h3><p><a href="/iPhone-Gallery">iPhone</a>,&nbsp;<a href="/iPad-Gallery">iPad</a></p><h3>Android</h3><p><a title="Google Device Gallery" href="/google-device-gallery">Google</a>,&nbsp;<a title="Samsung Device Gallery" href="/samsung-device-gallery">Samsung</a>, and&nbsp;<a href="/misc-device-gallery" title="HTC, LG, Acer, Motorola, Sony, One Plus, Vivo">others</a>.</p><h3><br style="color: rgba(0, 0, 0, 1); font-family: Verdana, Arial, Helvetica, sans-serif; font-size: 12.87px; font-weight: 700"></h3>
182</div>
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231      "description": "Set the optotype to display in mirror mode, and have the test subject read what is reflected in the mirror. And the eye chart app will calculate the score of distance visual acuity to detect early signs of myopia.",
232      "contentUrl": "https://visualacuity.info/media/default/video/AppPreviewPlayMirror.mp4",
233      "thumbnailUrl": "https://visualacuity.info/media/default/thumbnail/mirrorPlayThumb.png",
234      "uploadDate": "2025-08-30T12:00:00Z"
235    }
236  ]
237}
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238
239
240</div>
241
242    </div>
243</div>
244</section>
245
246
247    <div class="contentpart contentpart-html-custom-part">
248        
249
250<div class="field field-type-htmlfield field-name-html-custom-part-custom-html-field">
251    
252</div>
253
254    </div>
255
256
257
258</article>
259
260
261    </main>
262        <footer>
263            <div class="container">
264                
265
266<div class="widget-container">
267
268    <div class="widget widget-raw-html">
269    <div class="widget-body">
270        
271
272<div class="field field-type-htmlfield field-name-raw-html-content">
273    <footer class="footer">
274    <div class="container">
275        <div class="row align-items-center">
276            <div class="col-lg-4 text-lg-start">
277                Copyright © Fonlow 
277<script>document.write(new Date().getFullYear())</script>
277
278                
279                
280                                
281            </div>
282
283            <div class="col-lg-4 text-lg-end">
284                <a class="link-dark text-decoration-none me-3" href="VisualAcuityChartsPrivacyPolicy">Privacy Policy</a>
285            </div>
286        </div>
287    </div>
288</footer>
289</div>
290
291    </div>
292</div>
293
294</div>
295
296            </div>
297        </footer>
298    
298<script src="/OrchardCore.Resources/Scripts/popper.min.js?v=opng-X5k1M5uDUvXbW8uRcxP46CoHxtCjrYpsWlxSrc"></script>
298
299<script src="/OrchardCore.Resources/Scripts/bootstrap.min.js?v=W3BVkmhP32G5ZCevLlQBkw3dAcHMJFn4rvjB4Pgu0hA"></script>
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300<script src="/OrchardCore.Themes/Scripts/theme-manager.min.js?v=s-R3uAcmTH4Z8CFKBor9Qd_Zut1io-WjTU1zn1c57RU"></script>
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301
302</body>
303</html>

Line numbers count LF bytes from the start of the resource, as the search results do. Vendor segments are library code the classifier recognised; they are stored but not indexed. Bytes are shown as Latin1 characters, one per byte.