{"id":6823,"date":"2026-01-23T12:02:04","date_gmt":"2026-01-23T04:02:04","guid":{"rendered":"https:\/\/visioncare.com.hk\/?page_id=6823"},"modified":"2026-01-23T12:02:04","modified_gmt":"2026-01-23T04:02:04","slug":"colour-vision-test","status":"publish","type":"page","link":"https:\/\/visioncare.com.hk\/en\/colour-vision-test\/","title":{"rendered":"Colour Vision Test"},"content":{"rendered":"<p class=\"p1\">Colour Vision Test<\/p>\n<p class=\"p1\">Colour vision is our ability to detect colours.<\/p>\n<p class=\"p1\">When we are unable to differentiate between colours, we have colour deficiency or colour blindness. If we cannot tell red from green, for example, we have red green colour defects. It is extremely rare to have people who is completely colour blind<\/p>\n<p class=\"p1\">Colour deficiency is usually inherited and affects males more but it can also be caused by eye diseases such as glaucoma, diabetic retinopathy, macular degeneration and stroke or long-term use of some medications.<\/p>\n<p class=\"p1\">Two common colour vision tests:<\/p>\n<ol>\n<li>Pseudoisochromatic plates for colour vision screening (e.g. Ishihara Colour Test).<\/li>\n<\/ol>\n<ol start=\"2\">\n<li>Arrangement test for types of colour defect in which a certain number of colour buttons have to be arranged in the correct order from a pilot button (e.g. Farnsworth D-15 Test).<\/li>\n<\/ol>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-4514\" src=\"https:\/\/visioncare.com.hk\/wp-content\/uploads\/18-Colour-Vision-Test-photo-300x200.jpg\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" srcset=\"https:\/\/visioncare.com.hk\/wp-content\/uploads\/18-Colour-Vision-Test-photo-300x200.jpg 300w, https:\/\/visioncare.com.hk\/wp-content\/uploads\/18-Colour-Vision-Test-photo-768x511.jpg 768w, https:\/\/visioncare.com.hk\/wp-content\/uploads\/18-Colour-Vision-Test-photo-1024x681.jpg 1024w, https:\/\/visioncare.com.hk\/wp-content\/uploads\/18-Colour-Vision-Test-photo.jpg 1366w\" alt=\"\" width=\"300\" height=\"200\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Colour Vision Test Colour vision is our ability to detect colours. When we are unable to differentiate between colours, we have colour deficiency [&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-6823","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>Colour Vision Test - 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\/colour-vision-test\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Colour Vision Test - Vision Care\" \/>\n<meta property=\"og:description\" content=\"Colour Vision Test Colour vision is our ability to detect colours. When we are unable to differentiate between colours, we have colour deficiency [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/visioncare.com.hk\/en\/colour-vision-test\/\" \/>\n<meta property=\"og:site_name\" content=\"Vision Care\" \/>\n<meta property=\"og:image\" content=\"https:\/\/visioncare.com.hk\/wp-content\/uploads\/18-Colour-Vision-Test-photo.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=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/visioncare.com.hk\/en\/colour-vision-test\/\",\"url\":\"https:\/\/visioncare.com.hk\/en\/colour-vision-test\/\",\"name\":\"Colour Vision Test - Vision Care\",\"isPartOf\":{\"@id\":\"https:\/\/visioncare.com.hk\/en\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/visioncare.com.hk\/en\/colour-vision-test\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/visioncare.com.hk\/en\/colour-vision-test\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/visioncare.com.hk\/wp-content\/uploads\/18-Colour-Vision-Test-photo-300x200.jpg\",\"datePublished\":\"2026-01-23T04:02:04+00:00\",\"breadcrumb\":{\"@id\":\"https:\/\/visioncare.com.hk\/en\/colour-vision-test\/#breadcrumb\"},\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/visioncare.com.hk\/en\/colour-vision-test\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"en-US\",\"@id\":\"https:\/\/visioncare.com.hk\/en\/colour-vision-test\/#primaryimage\",\"url\":\"https:\/\/visioncare.com.hk\/wp-content\/uploads\/18-Colour-Vision-Test-photo-300x200.jpg\",\"contentUrl\":\"https:\/\/visioncare.com.hk\/wp-content\/uploads\/18-Colour-Vision-Test-photo-300x200.jpg\"},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/visioncare.com.hk\/en\/colour-vision-test\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"\u9996\u9801\",\"item\":\"https:\/\/visioncare.com.hk\/en\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Colour Vision Test\"}]},{\"@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":"Colour Vision Test - 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\/colour-vision-test\/","og_locale":"en_US","og_type":"article","og_title":"Colour Vision Test - Vision Care","og_description":"Colour Vision Test Colour vision is our ability to detect colours. 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