{"id":9783,"date":"2026-09-01T14:08:10","date_gmt":"2026-09-01T14:08:10","guid":{"rendered":"https:\/\/siview.ai\/?post_type=faq&#038;p=9783"},"modified":"2026-09-01T14:08:10","modified_gmt":"2026-09-01T14:08:10","slug":"what-method-does-siview-use-to-determine-the-presence-of-a-cylinder","status":"publish","type":"faq","link":"https:\/\/siview.ai\/en\/faq-en\/what-method-does-siview-use-to-determine-the-presence-of-a-cylinder\/","title":{"rendered":"What method does SiVIEW use to determine the presence of a cylinder?"},"excerpt":{"rendered":"<p>SiVIEW determines the presence of astigmatism using the Freeman 4-position method. This method consists of presenting several cylinder orientations: 0\u00b0, 90\u00b0, 135\u00b0, and 45\u00b0, in order to determine whether one of them is perceived as sharper or more comfortable by the patient. If one direction is preferred, the examination continues with steps to verify and [&hellip;]<\/p>\n","protected":false},"featured_media":0,"parent":0,"template":"","faq-box":[49,50],"faq-categorie":[105],"class_list":["post-9783","faq","type-faq","status-publish","hentry","faq-box-v1-en","faq-box-v2-en","faq-categorie-opto"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What method does SiVIEW use to determine the presence of a cylinder? &#8211; SiVIEW<\/title>\n<meta name=\"robots\" content=\"noindex, follow\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What method does SiVIEW use to determine the presence of a cylinder? &#8211; SiVIEW\" \/>\n<meta property=\"og:description\" content=\"SiVIEW determines the presence of astigmatism using the Freeman 4-position method. This method consists of presenting several cylinder orientations: 0\u00b0, 90\u00b0, 135\u00b0, and 45\u00b0, in order to determine whether one of them is perceived as sharper or more comfortable by the patient. If one direction is preferred, the examination continues with steps to verify and [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/siview.ai\/en\/faq-en\/what-method-does-siview-use-to-determine-the-presence-of-a-cylinder\/\" \/>\n<meta property=\"og:site_name\" content=\"SiVIEW\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/siview.ai\\\/en\\\/faq-en\\\/what-method-does-siview-use-to-determine-the-presence-of-a-cylinder\\\/\",\"url\":\"https:\\\/\\\/siview.ai\\\/en\\\/faq-en\\\/what-method-does-siview-use-to-determine-the-presence-of-a-cylinder\\\/\",\"name\":\"What method does SiVIEW use to determine the presence of a cylinder? &#8211; SiVIEW\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/siview.ai\\\/en\\\/#website\"},\"datePublished\":\"2026-09-01T14:08:10+00:00\",\"breadcrumb\":{\"@id\":\"https:\\\/\\\/siview.ai\\\/en\\\/faq-en\\\/what-method-does-siview-use-to-determine-the-presence-of-a-cylinder\\\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\\\/\\\/siview.ai\\\/en\\\/faq-en\\\/what-method-does-siview-use-to-determine-the-presence-of-a-cylinder\\\/\"]}]},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\\\/\\\/siview.ai\\\/en\\\/faq-en\\\/what-method-does-siview-use-to-determine-the-presence-of-a-cylinder\\\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Home\",\"item\":\"https:\\\/\\\/siview.ai\\\/en\\\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"What method does SiVIEW use to determine the presence of a cylinder?\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\\\/\\\/siview.ai\\\/en\\\/#website\",\"url\":\"https:\\\/\\\/siview.ai\\\/en\\\/\",\"name\":\"Siview\",\"description\":\"L\u2019intelligence artificielle au service de la r\u00e9fraction\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\\\/\\\/siview.ai\\\/en\\\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"en-US\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"What method does SiVIEW use to determine the presence of a cylinder? &#8211; SiVIEW","robots":{"index":"noindex","follow":"follow"},"og_locale":"en_US","og_type":"article","og_title":"What method does SiVIEW use to determine the presence of a cylinder? &#8211; SiVIEW","og_description":"SiVIEW determines the presence of astigmatism using the Freeman 4-position method. This method consists of presenting several cylinder orientations: 0\u00b0, 90\u00b0, 135\u00b0, and 45\u00b0, in order to determine whether one of them is perceived as sharper or more comfortable by the patient. If one direction is preferred, the examination continues with steps to verify and [&hellip;]","og_url":"https:\/\/siview.ai\/en\/faq-en\/what-method-does-siview-use-to-determine-the-presence-of-a-cylinder\/","og_site_name":"SiVIEW","twitter_card":"summary_large_image","schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/siview.ai\/en\/faq-en\/what-method-does-siview-use-to-determine-the-presence-of-a-cylinder\/","url":"https:\/\/siview.ai\/en\/faq-en\/what-method-does-siview-use-to-determine-the-presence-of-a-cylinder\/","name":"What method does SiVIEW use to determine the presence of a cylinder? &#8211; SiVIEW","isPartOf":{"@id":"https:\/\/siview.ai\/en\/#website"},"datePublished":"2026-09-01T14:08:10+00:00","breadcrumb":{"@id":"https:\/\/siview.ai\/en\/faq-en\/what-method-does-siview-use-to-determine-the-presence-of-a-cylinder\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/siview.ai\/en\/faq-en\/what-method-does-siview-use-to-determine-the-presence-of-a-cylinder\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/siview.ai\/en\/faq-en\/what-method-does-siview-use-to-determine-the-presence-of-a-cylinder\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/siview.ai\/en\/"},{"@type":"ListItem","position":2,"name":"What method does SiVIEW use to determine the presence of a cylinder?"}]},{"@type":"WebSite","@id":"https:\/\/siview.ai\/en\/#website","url":"https:\/\/siview.ai\/en\/","name":"Siview","description":"L\u2019intelligence artificielle au service de la r\u00e9fraction","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/siview.ai\/en\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"en-US"}]}},"_links":{"self":[{"href":"https:\/\/siview.ai\/en\/wp-json\/wp\/v2\/faq\/9783","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/siview.ai\/en\/wp-json\/wp\/v2\/faq"}],"about":[{"href":"https:\/\/siview.ai\/en\/wp-json\/wp\/v2\/types\/faq"}],"wp:attachment":[{"href":"https:\/\/siview.ai\/en\/wp-json\/wp\/v2\/media?parent=9783"}],"wp:term":[{"taxonomy":"faq-box","embeddable":true,"href":"https:\/\/siview.ai\/en\/wp-json\/wp\/v2\/faq-box?post=9783"},{"taxonomy":"faq-categorie","embeddable":true,"href":"https:\/\/siview.ai\/en\/wp-json\/wp\/v2\/faq-categorie?post=9783"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}