{"id":33027,"date":"2025-12-05T03:03:26","date_gmt":"2025-12-05T11:03:26","guid":{"rendered":"https:\/\/www.clearly.ca\/thelook\/?p=33027"},"modified":"2025-12-05T03:03:29","modified_gmt":"2025-12-05T11:03:29","slug":"how-contact-lenses-work-2","status":"publish","type":"post","link":"https:\/\/www.clearly.ca\/thelook\/how-contact-lenses-work-2\/","title":{"rendered":"How do contact lenses work?"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\" id=\"h-what-are-contact-lenses\">What are contact lenses?\u00a0\u00a0<\/h2>\n\n\n\n<p><a href=\"https:\/\/www.clearly.ca\/en-ca\/contact-lenses\" target=\"_blank\" rel=\"noreferrer noopener\">Contact lenses<\/a>&nbsp;are&nbsp;very&nbsp;small, curved&nbsp;discs that users can place directly onto the surface of&nbsp;their&nbsp;eyes&nbsp;to correct&nbsp;their&nbsp;vision.&nbsp;&nbsp;They are usually made of soft, pliable plastic called hydrogel.&nbsp;&nbsp;<\/p>\n\n\n\n<p>Hydrogel absorbs and&nbsp;retains&nbsp;water, making it flexible enough to comfortably sit on the cornea (the front surface of the eye). This water retention also allows oxygen to pass through the&nbsp;contact&nbsp;lens&nbsp;so it can&nbsp;nourish and hydrate the cornea.&nbsp;&nbsp;<\/p>\n\n\n\n<p>While most people rely on contact lenses for vision correction, they can also be worn for cosmetic reasons.\u00a0For example,\u00a0<a href=\"https:\/\/www.clearly.ca\/en-ca\/contact-lenses\/coloured-contacts\" target=\"_blank\" rel=\"noreferrer noopener\">coloured\u00a0contacts<\/a>\u00a0give your eyes the appearance of being\u00a0a different\u00a0colour, and may or may not include vision correction. Special effects contacts are often used\u00a0with costumes \u2014 think\u00a0movie\u00a0sets\u00a0and\u00a0Halloween\u00a0\u2014\u00a0to give the eyes unnatural characteristics.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-how-do-contacts-work\">How do contacts work?\u00a0<\/h2>\n\n\n\n<p>Similar&nbsp;to&nbsp;eyeglasses,&nbsp;<a href=\"https:\/\/www.clearly.ca\/en-ca\/contact-lenses\/single-vision\" target=\"_blank\" rel=\"noreferrer noopener\">single-vision&nbsp;<\/a>contact&nbsp;lenses&nbsp;work by bending light to&nbsp;correct&nbsp;refractive errors.&nbsp;A refractive error&nbsp;is&nbsp;a&nbsp;type of vision problem that occurs&nbsp;when&nbsp;irregularities in the eye&nbsp;affect how light is focused.&nbsp;When light does not focus properly on the retina&nbsp;at the back of the eye,&nbsp;blurry vision may result.&nbsp;<\/p>\n\n\n\n<p>The following&nbsp;refractive errors&nbsp;can often be corrected with&nbsp;prescription&nbsp;contact lenses:&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Myopia (nearsightedness)<\/strong>\u00a0\u2013 Affects distance vision\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Hyperopia (farsightedness)<\/strong>\u00a0\u2013\u00a0Affects near vision\u00a0and sometimes distance vision\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Astigmatism<\/strong>\u00a0\u2013 Affects distance and near vision\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Presbyopia<\/strong>\u00a0\u2013 Affects near vision due to age-related changes\u00a0to the eye\u2019s lens\u00a0<\/li>\n<\/ul>\n\n\n\n<p>Contact lenses correct refractive errors by&nbsp;bending&nbsp;light before it enters the eyes. This allows light to focus correctly on the&nbsp;retina, the&nbsp;light-sensitive tissue at the back of the eye.&nbsp;<\/p>\n\n\n\n<p>If you\u00a0have presbyopia and\u00a0need vision correction at more than one distance,\u00a0your eye doctor may recommend\u00a0that you\u00a0<a href=\"https:\/\/www.clearly.ca\/en-ca\/contact-lenses\/multifocal\" target=\"_blank\" rel=\"noreferrer noopener\">try\u00a0multifocal contact lenses.<\/a>\u00a0Multifocal\u00a0lenses\u00a0such as progressive\u00a0and\u00a0<a href=\"https:\/\/www.clearly.ca\/thelook\/how-do-multifocal-bifocal-contacts-work\" target=\"_blank\" rel=\"noreferrer noopener\">bifocal contacts\u00a0work<\/a>\u00a0by\u00a0correcting\u00a0vision at multiple distances.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-types-of-contact-lenses\">Types of contact lenses<\/h2>\n\n\n\n<p>The&nbsp;different types&nbsp;of contact lenses are&nbsp;categorized&nbsp;by&nbsp;the&nbsp;materials&nbsp;they\u2019re&nbsp;made&nbsp;with&nbsp;and&nbsp;the&nbsp;purpose they serve.&nbsp;Below are some of&nbsp;the most common types of contacts that an eye doctor may prescribe:&nbsp;&nbsp;<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Soft\u00a0contact\u00a0lenses<\/strong>\u00a0\u2013 Made of soft, flexible plastics that\u00a0are\u00a0generally more\u00a0comfortable to wear than other types\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Rigid\u00a0gas\u00a0permeable (RGP)\u00a0contact\u00a0lenses<\/strong>\u00a0\u2013\u00a0Made of a firm, durable plastic;\u00a0often prescribed for\u00a0severe\u00a0astigmatism\u00a0or irregular corneas\u00a0\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Hybrid\u00a0contact\u00a0lenses<\/strong>\u00a0\u2013\u00a0Have a rigid\u00a0centre\u00a0surrounded by a soft outer ring, combining the\u00a0visual clarity\u00a0of RGP lenses\u00a0and the\u00a0comfort\u00a0of soft\u00a0contacts\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.clearly.ca\/en-ca\/contact-lenses\/toric-contacts\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>Toric contact lenses<\/strong><\/a>\u00a0\u2013\u00a0A\u00a0type of soft contact lenses prescribed for astigmatism\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Scleral\u00a0contact\u00a0lenses<\/strong>\u00a0\u2013\u00a0Have a\u00a0large\u00a0diameter\u00a0that\u00a0covers\u00a0the entire corneal surface and rests\u00a0on the\u00a0sclera (the\u00a0white part of the eye)\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Orthokeratology (Ortho-K)\u00a0lenses<\/strong>\u00a0\u2013\u00a0Specially designed\u00a0hard\u00a0contact lenses\u00a0that are\u00a0worn overnight to\u00a0temporarily\u00a0reshape the cornea; used\u00a0mainly to\u00a0correct myopia\u00a0\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Daily\u00a0wear\u00a0contact lenses\u00a0<\/strong>\u2013\u00a0Designed to be worn all day then removed at night before bed\u00a0for\u00a0storage or\u00a0disposal (this\u00a0is\u00a0determined\u00a0by\u00a0the recommended replacement schedule)\u00a0<\/li>\n<\/ul>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Extended-wear\u00a0contacts<\/strong>\u00a0\u2013 Made to\u00a0be worn continuously for up to\u00a030 days<\/li>\n<\/ul>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-how-are-contact-lenses-made\">How are contact lenses made?<\/h2>\n\n\n\n<p>Different\u00a0methods\u00a0are used to\u00a0ensure your contact lenses fit perfectly against your eyes. These\u00a0techniques\u00a0include:\u00a0<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-injection-moulding\">Injection\u00a0moulding<\/h3>\n\n\n\n<p>This creation method\u00a0is used for soft contact lenses. It\u00a0involves injecting molten plastic into a\u00a0mould\u00a0and then\u00a0putting it\u00a0under pressure to form the\u00a0lens. The\u00a0mould\u00a0has two parts that have different curvature for different lens prescriptions.<\/p>\n\n\n\n<p>After the plastic is shaped with the\u00a0moulds,\u00a0it\u2019s\u00a0cured in an oven,\u00a0then packaged and hydrated in water to\u00a0create\u00a0lens\u00a0flexibility. From there, contact solution is added to the\u00a0sterilized\u00a0contact lens container, then heat-sealed with a foil cover.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-lathe-cutting\">Lathe cutting<\/h3>\n\n\n\n<p>While this method is also used for soft lenses,&nbsp;it\u2019s&nbsp;most often used for rigid lenses. For context, lathe cutting is&nbsp;like&nbsp;creating an ice sculpture, where&nbsp;a block of&nbsp;material is carved&nbsp;into&nbsp;a&nbsp;desired shape.&nbsp;<\/p>\n\n\n\n<p>Rather than a block of ice,&nbsp;a non-hydrated disc of contact lens material is mounted on a machine.&nbsp;The machine&nbsp;then&nbsp;spins the material quickly&nbsp;\u2014&nbsp;about 100 rotations per second&nbsp;\u2014 while&nbsp;a laser cutter makes precise,&nbsp;digitally measured&nbsp;cuts into&nbsp;the lens material.&nbsp;&nbsp;<\/p>\n\n\n\n<p>Once the front and back of the lens\u00a0are\u00a0shaped by the laser cutter, the lens is polished and hydrated.\u00a0RGP lenses\u00a0are made\u00a0following\u00a0this same meticulous\u00a0process, but\u00a0they\u00a0are delivered to the eye doctor dry. The eye doctor will\u00a0then\u00a0soak the lenses before\u00a0giving\u00a0them to the patient.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-the-history-of-contact-lenses\">The history of contact lenses<\/h2>\n\n\n\n<p>Contact lenses\u00a0weren\u2019t\u00a0conceptualized\u00a0or\u00a0perfected right away. The\u00a0idea\u00a0for them started in the early 1500s and\u00a0slowly developed over time.\u00a0\u00a0Check out the general timeline\u00a0below to see\u00a0how\u00a0contact lenses\u00a0have\u00a0evolved\u00a0throughout the years:<\/p>\n\n\n\n<p><strong>1508&nbsp;<\/strong>\u2013 Leonardo da Vinci shares&nbsp;the first concept of contact lenses.&nbsp;<\/p>\n\n\n\n<p><strong>1887&nbsp;<\/strong>\u2013 The first contact lens&nbsp;is manufactured,&nbsp;made of&nbsp;glass&nbsp;and covering&nbsp;the&nbsp;whole&nbsp; eye.&nbsp;<\/p>\n\n\n\n<p><strong>1939&nbsp;<\/strong>\u2013 The first plastic contact lenses&nbsp;are made&nbsp;\u2014&nbsp;and&nbsp;they still cover the entire eye.&nbsp;<\/p>\n\n\n\n<p><strong>1948&nbsp;<\/strong>\u2013 Plastic contact lenses&nbsp;are remade to cover only the cornea rather than the whole&nbsp; eye.&nbsp;<\/p>\n\n\n\n<p><strong>1971&nbsp;<\/strong>\u2013 Soft contact lenses&nbsp;are invented.&nbsp;<\/p>\n\n\n\n<p><strong>1978&nbsp;<\/strong>\u2013 Gas permeable lenses&nbsp;are created.&nbsp;<\/p>\n\n\n\n<p><strong>1981&nbsp;<\/strong>\u2013 Extended-wear soft contacts become available.&nbsp;<\/p>\n\n\n\n<p><strong>1982&nbsp;<\/strong>\u2013 Bifocal soft contact lenses&nbsp;are invented.&nbsp;<\/p>\n\n\n\n<p><strong>1986&nbsp;<\/strong>\u2013 Gas permeable lenses&nbsp;are approved for overnight wear.&nbsp;<\/p>\n\n\n\n<p><strong>1996&nbsp;<\/strong>\u2013 Daily disposable soft contact lenses&nbsp;are introduced.&nbsp;<\/p>\n\n\n\n<p><strong>2002&nbsp;<\/strong>\u2013 Orthokeratology lenses&nbsp;are approved by the&nbsp;U.S. Food and Drug Administration (FDA)&nbsp;to be worn overnight.&nbsp;<\/p>\n\n\n\n<p><strong>2010<\/strong>&nbsp;\u2013 Custom-manufactured silicone-hydrogel lenses become available.&nbsp;<\/p>\n\n\n\n<p><strong>2018<\/strong>\u00a0\u2013 Photochromic\u00a0(light-adaptive)\u00a0contact lenses\u00a0are approved by the FDA.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-schedule-a-contact-lens-exam-fitting-to-learn-more\">Schedule a contact lens exam fitting to learn more<\/h2>\n\n\n\n<p>Whether&nbsp;you\u2019re&nbsp;interested in contacts to correct&nbsp;your vision or to give your eyes an interesting&nbsp;new look,&nbsp;your&nbsp;eye doctor&nbsp;can help.&nbsp;&nbsp;<\/p>\n\n\n\n<p>They can perform&nbsp;an eye exam&nbsp;to check your vision and eye health, then do a&nbsp;contact lens fitting&nbsp;to&nbsp;determine&nbsp;your&nbsp;<a href=\"https:\/\/www.clearly.ca\/thelook\/how-to-read-glasses-contact-lens-prescriptions\" target=\"_blank\" rel=\"noreferrer noopener\">contact lens prescription<\/a>. (It\u2019s&nbsp;different from your glasses prescription.)&nbsp;This ensures&nbsp;you get the best type of contacts for your needs and&nbsp;minimizes&nbsp;the risk of&nbsp;any&nbsp;complications.&nbsp;&nbsp;<\/p>\n\n\n\n<p><a href=\"https:\/\/www.clearly.ca\/en-ca\/store-locator\" target=\"_blank\" rel=\"noreferrer noopener\">Book an eye exam<\/a>\u00a0to get a\u00a0new\u00a0contact lens prescription or to update\u00a0your old\u00a0one.<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p><strong>SOURCES<\/strong>&nbsp;<\/p>\n\n\n\n<ol start=\"1\" class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.allaboutvision.com\/contacts\/faq\/contact-materials.htm\" target=\"_blank\" rel=\"noreferrer noopener\">What are contacts made of?<\/a>\u00a0All About Vision. January 2019.\u00a0\u00a0<\/li>\n<\/ol>\n\n\n\n<ol start=\"2\" class=\"wp-block-list\">\n<li><a href=\"https:\/\/my.clevelandclinic.org\/health\/articles\/10737-contacts\" target=\"_blank\" rel=\"noreferrer noopener\">Contacts<\/a>. Cleveland Clinic. July 2023.\u00a0<\/li>\n<\/ol>\n\n\n\n<ol start=\"3\" class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.nei.nih.gov\/learn-about-eye-health\/eye-conditions-and-diseases\/refractive-errors\" target=\"_blank\" rel=\"noreferrer noopener\">Refractive errors<\/a>. National Eye Institute. November 2023.\u00a0<\/li>\n<\/ol>\n\n\n\n<ol start=\"4\" class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.goodrx.com\/health-topic\/eye\/an-overview-of-bifocal-contact-lenses\" target=\"_blank\" rel=\"noreferrer noopener\">Should you get bifocal contact lenses?<\/a>\u00a0GoodRx\u00a0Health. August 2021.\u00a0<\/li>\n<\/ol>\n\n\n\n<ol start=\"5\" class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.visioncenter.org\/contacts\/rgp\/\" target=\"_blank\" rel=\"noreferrer noopener\">Gas permeable contact lenses (RGP or\u00a0GP)<\/a>. Vision Center. February 2024.\u00a0<\/li>\n<\/ol>\n\n\n\n<ol start=\"6\" class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.verywellhealth.com\/what-is-a-hybrid-contact-lens-3421661\" target=\"_blank\" rel=\"noreferrer noopener\">Hybrid contact lenses and your eyes<\/a>.\u00a0Verywell\u00a0Health. October 2022.\u00a0<\/li>\n<\/ol>\n\n\n\n<ol start=\"7\" class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.allaboutvision.com\/contacts\/torics.htm\" target=\"_blank\" rel=\"noreferrer noopener\">Contact lenses for astigmatism<\/a>. All About Vision. February 2019.\u00a0<\/li>\n<\/ol>\n\n\n\n<ol start=\"8\" class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.aao.org\/eye-health\/glasses-contacts\/what-is-orthokeratology\" target=\"_blank\" rel=\"noreferrer noopener\">What is orthokeratology?<\/a>\u00a0<em>EyeSmart<\/em>.\u00a0American\u00a0Academy of Ophthalmology. April 2023.\u00a0<\/li>\n<\/ol>\n\n\n\n<ol start=\"9\" class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.discoveryuk.com\/how-its-made\/how-are-contact-lenses-made\/\" target=\"_blank\" rel=\"noreferrer noopener\">How are contact lenses made?<\/a>\u00a0Discovery UK. June 2022.\u00a0<\/li>\n<\/ol>\n\n\n\n<ol start=\"10\" class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.allaboutvision.com\/contacts\/faq\/how-cls-made.htm\" target=\"_blank\" rel=\"noreferrer noopener\">How are contact lenses made?<\/a>\u00a0All About Vision. January 2019.\u00a0<\/li>\n<\/ol>\n\n\n\n<ol start=\"11\" class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.allaboutvision.com\/contacts\/faq\/when-invented.htm\" target=\"_blank\" rel=\"noreferrer noopener\">When were contact lenses invented?<\/a>\u00a0All About Vision. January 2019.\u00a0<\/li>\n<\/ol>\n\n\n\n<ol start=\"12\" class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.fda.gov\/news-events\/press-announcements\/fda-clears-first-contact-lens-light-adaptive-technology\" target=\"_blank\" rel=\"noreferrer noopener\">FDA clears first contact lens with light-adaptive technology<\/a>. U.S. Food and Drug Administration.\u00a0April 2018.<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>What are contact lenses?\u00a0\u00a0 Contact lenses&nbsp;are&nbsp;very&nbsp;small, curved&nbsp;discs that users can place directly onto the surface of&nbsp;their&nbsp;eyes&nbsp;to correct&nbsp;their&nbsp;vision.&nbsp;&nbsp;They are usually made of soft, pliable plastic&#8230;<\/p>\n","protected":false},"author":58,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[307],"class_list":["post-33027","post","type-post","status-publish","format-standard","hentry","category-eye-care","tag-contact-lenses"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.0 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>What are contact lenses and how do they work? | Clearly CA<\/title>\n<meta name=\"description\" content=\"Learn about corrective contact lenses, including how they work, the different types of contact lenses, and how they&#039;re made.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.clearly.ca\/thelook\/how-contact-lenses-work-2\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How do contact lenses work?\" \/>\n<meta property=\"og:description\" content=\"Learn about corrective contact lenses, including how they work, the different types of contact lenses, and how they&#039;re made.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.clearly.ca\/thelook\/how-contact-lenses-work-2\/\" \/>\n<meta property=\"og:site_name\" content=\"Clearly Blog - Eye Care &amp; Eyewear Trends\" \/>\n<meta property=\"article:published_time\" content=\"2025-12-05T11:03:26+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-12-05T11:03:29+00:00\" \/>\n<meta name=\"author\" content=\"Clearly Author\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Clearly Author\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"5 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.clearly.ca\/thelook\/how-contact-lenses-work-2\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.clearly.ca\/thelook\/how-contact-lenses-work-2\/\"},\"author\":{\"name\":\"Clearly Author\",\"@id\":\"https:\/\/www.clearly.ca\/thelook\/#\/schema\/person\/25662903a9e556d29841d6de79d9bf49\"},\"headline\":\"How do contact lenses work?\",\"datePublished\":\"2025-12-05T11:03:26+00:00\",\"dateModified\":\"2025-12-05T11:03:29+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.clearly.ca\/thelook\/how-contact-lenses-work-2\/\"},\"wordCount\":1287,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.clearly.ca\/thelook\/#organization\"},\"keywords\":[\"Contact lenses\"],\"articleSection\":[\"Eye Care\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.clearly.ca\/thelook\/how-contact-lenses-work-2\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.clearly.ca\/thelook\/how-contact-lenses-work-2\/\",\"url\":\"https:\/\/www.clearly.ca\/thelook\/how-contact-lenses-work-2\/\",\"name\":\"What are contact lenses and how do they work? 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