{"id":6812,"date":"2026-01-23T11:49:39","date_gmt":"2026-01-23T03:49:39","guid":{"rendered":"https:\/\/visioncare.com.hk\/?page_id=6812"},"modified":"2026-01-23T11:49:39","modified_gmt":"2026-01-23T03:49:39","slug":"intraocular-pressure-measurement","status":"publish","type":"page","link":"https:\/\/visioncare.com.hk\/en\/intraocular-pressure-measurement\/","title":{"rendered":"Intraocular Pressure Measurement"},"content":{"rendered":"<p class=\"p1\">Intraocular Pressure Measurement<\/p>\n<p class=\"p1\">Measurement of the intra-ocular pressure (IOP) of the eye is termed Tonometry.<\/p>\n<p class=\"p1\">As Intra-ocular pressure is one of the risk factors for glaucoma, it is measured as a routine procedure in a primary eye care examination as a screening and diagnostic tool for the assessment of glaucoma. The IOP values can also be used a measurement of efficacy of glaucoma treatment.<\/p>\n<p class=\"p1\">Normal IOP values range from 10 \u2013 21 mmHg. It should be noted that normal IOP values do not necessarily exclude the possible presence of glaucoma.<\/p>\n<p class=\"p1\">Clinically, there are two ways IOP can be measured:<\/p>\n<ol>\n<li>Contact Tonometry\n<ul>\n<li>The cornea is first anaesthetised before the contact tonometer is touching the cornea for a pressure reading in mmHg. (Photo 1)<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<ol start=\"2\">\n<li>Non-Contact Tonometry\n<ul>\n<li>No anaesthesia is required. A small puff of air is sent to the surface of the cornea and a digital device receives and interprets the deflected air for an IOP reading in mmHg. (Photo 2)<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<p>(Photo 1)<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-4502\" src=\"https:\/\/visioncare.com.hk\/wp-content\/uploads\/13-Intraocular-pressure-%E7%9C%BC%E5%A3%93-photo-1-300x200.jpg\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" srcset=\"https:\/\/visioncare.com.hk\/wp-content\/uploads\/13-Intraocular-pressure-\u773c\u58d3-photo-1-300x200.jpg 300w, https:\/\/visioncare.com.hk\/wp-content\/uploads\/13-Intraocular-pressure-\u773c\u58d3-photo-1-768x511.jpg 768w, https:\/\/visioncare.com.hk\/wp-content\/uploads\/13-Intraocular-pressure-\u773c\u58d3-photo-1-1024x681.jpg 1024w, https:\/\/visioncare.com.hk\/wp-content\/uploads\/13-Intraocular-pressure-\u773c\u58d3-photo-1.jpg 1366w\" alt=\"\" width=\"300\" height=\"200\" \/><\/p>\n<p>(Photo 2)<br \/>\n<img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-4504\" src=\"https:\/\/visioncare.com.hk\/wp-content\/uploads\/13-Intraocular-pressure-%E7%9C%BC%E5%A3%93-photo-2-300x225.jpg\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" srcset=\"https:\/\/visioncare.com.hk\/wp-content\/uploads\/13-Intraocular-pressure-\u773c\u58d3-photo-2-300x225.jpg 300w, https:\/\/visioncare.com.hk\/wp-content\/uploads\/13-Intraocular-pressure-\u773c\u58d3-photo-2-768x576.jpg 768w, https:\/\/visioncare.com.hk\/wp-content\/uploads\/13-Intraocular-pressure-\u773c\u58d3-photo-2.jpg 800w\" alt=\"\" width=\"300\" height=\"225\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Intraocular Pressure Measurement Measurement of the intra-ocular pressure (IOP) of the eye is termed Tonometry. As Intra-ocular pressure is one of the risk [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"class_list":["post-6812","page","type-page","status-publish","hentry"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.2 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Intraocular Pressure Measurement - Vision Care<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/visioncare.com.hk\/en\/intraocular-pressure-measurement\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Intraocular Pressure Measurement - Vision Care\" \/>\n<meta property=\"og:description\" content=\"Intraocular Pressure Measurement Measurement of the intra-ocular pressure (IOP) of the eye is termed Tonometry. As Intra-ocular pressure is one of the risk [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/visioncare.com.hk\/en\/intraocular-pressure-measurement\/\" \/>\n<meta property=\"og:site_name\" content=\"Vision Care\" \/>\n<meta property=\"og:image\" content=\"https:\/\/visioncare.com.hk\/wp-content\/uploads\/13-Intraocular-pressure-\u773c\u58d3-photo-1.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1366\" \/>\n\t<meta property=\"og:image:height\" content=\"909\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/visioncare.com.hk\/en\/intraocular-pressure-measurement\/\",\"url\":\"https:\/\/visioncare.com.hk\/en\/intraocular-pressure-measurement\/\",\"name\":\"Intraocular Pressure Measurement - Vision Care\",\"isPartOf\":{\"@id\":\"https:\/\/visioncare.com.hk\/en\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/visioncare.com.hk\/en\/intraocular-pressure-measurement\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/visioncare.com.hk\/en\/intraocular-pressure-measurement\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/visioncare.com.hk\/wp-content\/uploads\/13-Intraocular-pressure-%E7%9C%BC%E5%A3%93-photo-1-300x200.jpg\",\"datePublished\":\"2026-01-23T03:49:39+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/visioncare.com.hk\/en\/intraocular-pressure-measurement\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/visioncare.com.hk\/en\/intraocular-pressure-measurement\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/visioncare.com.hk\/en\/intraocular-pressure-measurement\/#primaryimage\",\"url\":\"https:\/\/visioncare.com.hk\/wp-content\/uploads\/13-Intraocular-pressure-%E7%9C%BC%E5%A3%93-photo-1-300x200.jpg\",\"contentUrl\":\"https:\/\/visioncare.com.hk\/wp-content\/uploads\/13-Intraocular-pressure-%E7%9C%BC%E5%A3%93-photo-1-300x200.jpg\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/visioncare.com.hk\/en\/intraocular-pressure-measurement\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u9996\u9801\",\"item\":\"https:\/\/visioncare.com.hk\/en\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Intraocular Pressure Measurement\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/visioncare.com.hk\/en\/#website\",\"url\":\"https:\/\/visioncare.com.hk\/en\/\",\"name\":\"Vision Care\",\"description\":\"\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/visioncare.com.hk\/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":"Intraocular Pressure Measurement - Vision Care","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/visioncare.com.hk\/en\/intraocular-pressure-measurement\/","og_locale":"en_US","og_type":"article","og_title":"Intraocular Pressure Measurement - Vision Care","og_description":"Intraocular Pressure Measurement Measurement of the intra-ocular pressure (IOP) of the eye is termed Tonometry. 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