{"version":"1.0","provider_name":"Excimer Ophthalmology Clinics - diagnosis and treatment of eye diseases in adults and children","provider_url":"https:\/\/eximer.ua\/en\/","author_name":"verbova","author_url":"https:\/\/eximer.ua\/en\/blog\/author\/verbova\/","title":"Duochrome test","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"X76EBqLlFe\"><a href=\"https:\/\/eximer.ua\/en\/blog\/2025\/11\/04\/duochrome-test\/\">Duochrome test<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/eximer.ua\/en\/blog\/2025\/11\/04\/duochrome-test\/embed\/#?secret=X76EBqLlFe\" width=\"600\" height=\"338\" title=\"&#8220;Duochrome test&#8221; &#8212; Excimer Ophthalmology Clinics - diagnosis and treatment of eye diseases in adults and children\" data-secret=\"X76EBqLlFe\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" class=\"wp-embedded-content\"><\/iframe><script>\n\/*! This file is auto-generated *\/\n!function(d,l){\"use strict\";l.querySelector&&d.addEventListener&&\"undefined\"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!\/[^a-zA-Z0-9]\/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret=\"'+t.secret+'\"]'),o=l.querySelectorAll('blockquote[data-secret=\"'+t.secret+'\"]'),c=new RegExp(\"^https?:$\",\"i\"),i=0;i<o.length;i++)o[i].style.display=\"none\";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute(\"style\"),\"height\"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):\"link\"===t.message&&(r=new URL(s.getAttribute(\"src\")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener(\"message\",d.wp.receiveEmbedMessage,!1),l.addEventListener(\"DOMContentLoaded\",function(){for(var e,t,s=l.querySelectorAll(\"iframe.wp-embedded-content\"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute(\"data-secret\"))||(t=Math.random().toString(36).substring(2,12),e.src+=\"#?secret=\"+t,e.setAttribute(\"data-secret\",t)),e.contentWindow.postMessage({message:\"ready\",secret:t},\"*\")},!1)))}(window,document);\n\/\/# sourceURL=https:\/\/eximer.ua\/wp-includes\/js\/wp-embed.min.js\n<\/script>\n","thumbnail_url":"https:\/\/eximer.ua\/wp-content\/uploads\/2025\/11\/online-vision-1.jpg","thumbnail_width":724,"thumbnail_height":594,"description":"Online test for myopia, hyperopia, emmetropia.  Ametropia occurs when the length of the eye and its refractive power do not match. In this case, the image does not fall exactly on the retina, but is formed in front of it or behind it, which causes a loss of clarity of vision. How to determine whether the cause is myopia or hyperopia? For this, a duochrome test is used, which helps to distinguish the main types of ametropia."}