{"id":865,"date":"2019-07-27T21:48:23","date_gmt":"2019-07-27T11:48:23","guid":{"rendered":"https:\/\/www.framesbuy.com.au\/trends\/?p=865"},"modified":"2026-07-28T21:20:25","modified_gmt":"2026-07-28T11:50:25","slug":"understand-your-contact-lens-prescription","status":"publish","type":"post","link":"https:\/\/www.framesbuy.com.au\/trends\/understand-your-contact-lens-prescription\/","title":{"rendered":"Easy Guide to Understand your Contact lens Prescription"},"content":{"rendered":"\n<div class=\"wp-block-group has-perfect-white-gradient-background has-background is-layout-constrained wp-block-group-is-layout-constrained\">\n<h2 class=\"wp-block-heading has-medium-font-size\">Key Takeaways<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Unlike glasses, contact lenses require a precise prescription.<\/li>\n\n\n\n<li>The base curve and diameter aid in ensuring comfortable and appropriate lens fit.<\/li>\n\n\n\n<li>Nearsightedness and farsightedness can be corrected with sphere power.<\/li>\n\n\n\n<li>Astigmatism correction requires cylinder and axis values.<\/li>\n\n\n\n<li>Prescriptions for contact lenses have expiration dates and necessitate routine eye exams.<\/li>\n\n\n\n<li>Eye infections and pain can result from using the incorrect lenses.<\/li>\n\n\n\n<li>Maintaining contact lenses properly helps preserve vision and eye health.<\/li>\n<\/ul>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Contact lenses no longer serve as just a fashion accessory. More than half of the world population wear contact lenses and millions out there wear for vision correction purpose. However, you cannot just pick any contacts and expect to see clearly. There is no such thing as one size fits all in contact lenses.<\/p>\n\n\n\n<h5 class=\"wp-block-heading blue-color\">Not following instructions about contact lens care and wrong contact lens prescription often lead to serious eye infections.<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">Just like glasses have prescription, even contact lenses have prescription. In countries like the US, you can get into legal trouble if you buy lenses without prescription (yes, probably even for fashion purpose). It\u2019s actually fair enough, as improper contact lenses can permanently damage your eye tissue and make vision condition worse.<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"360\" data-id=\"839\" src=\"https:\/\/www.framesbuy.com.au\/trends\/wp-content\/uploads\/2018\/11\/Contact_Lenses_wearing_step2.jpg\" alt=\"Contact_Lenses_wearing_step2\" class=\"wp-image-839\" srcset=\"https:\/\/www.framesbuy.com.au\/trends\/wp-content\/uploads\/2018\/11\/Contact_Lenses_wearing_step2.jpg 800w, https:\/\/www.framesbuy.com.au\/trends\/wp-content\/uploads\/2018\/11\/Contact_Lenses_wearing_step2-300x135.jpg 300w, https:\/\/www.framesbuy.com.au\/trends\/wp-content\/uploads\/2018\/11\/Contact_Lenses_wearing_step2-768x346.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"900\" height=\"561\" data-id=\"2476\" src=\"https:\/\/www.framesbuy.com.au\/trends\/wp-content\/uploads\/2019\/07\/contact-lens.png\" alt=\"contact lens\" class=\"wp-image-2476\" srcset=\"https:\/\/www.framesbuy.com.au\/trends\/wp-content\/uploads\/2019\/07\/contact-lens.png 900w, https:\/\/www.framesbuy.com.au\/trends\/wp-content\/uploads\/2019\/07\/contact-lens-300x187.png 300w, https:\/\/www.framesbuy.com.au\/trends\/wp-content\/uploads\/2019\/07\/contact-lens-768x479.png 768w, https:\/\/www.framesbuy.com.au\/trends\/wp-content\/uploads\/2019\/07\/contact-lens-380x237.png 380w, https:\/\/www.framesbuy.com.au\/trends\/wp-content\/uploads\/2019\/07\/contact-lens-800x499.png 800w\" sizes=\"auto, (max-width: 900px) 100vw, 900px\" \/><\/figure>\n<\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Buying good quality contact lenses as per prescription ensure you with safe, comfortable and optimum vision. So if you are considering to switch to contacts, go for it. You&#8217;ll love the transition. Be ready with the prescription to bring the change. Wait, if you think you can use your <a href=\"https:\/\/www.framesbuy.com.au\/page\/glasses-prescription-explained\" target=\"_blank\" rel=\"noreferrer noopener\">glasses prescription<\/a> for contact lenses, then it\u2019s the biggest mistake you can ever do. Yes, prescription glasses and contact lenses prescription are different even for the same vision condition. The general parameters are common for prescription glasses and contact lenses. But since contact directly fits on your cornea, unlike glasses which are at a distant, the prescription varies.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">So if you are switching to contacts, visit an eye doctor for an eye checkup and get the prescription for contact lenses. Once you are ready with the prescription, it\u2019s time to understand it. The several codes and figures on the prescription may seem like Greek to you but believe it\u2019s really very simple to crack the code. You don\u2019t have to master it as a doctor, you simply need to understand it to avoid medical error.<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h4 class=\"wp-block-heading\">Understanding each abbreviation and figure on your prescription:<\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">In addition to SPH, CYL, AXIS, ADD, PD contact lens prescription includes Base Curve (BC) and Diameter (DIA) which ensures the lens fits properly on the cornea.<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"800\" height=\"360\" src=\"https:\/\/www.framesbuy.com.au\/trends\/wp-content\/uploads\/2019\/07\/contact-lens-prescription.jpg\" alt=\"contact lens prescription\" class=\"wp-image-2478\" srcset=\"https:\/\/www.framesbuy.com.au\/trends\/wp-content\/uploads\/2019\/07\/contact-lens-prescription.jpg 800w, https:\/\/www.framesbuy.com.au\/trends\/wp-content\/uploads\/2019\/07\/contact-lens-prescription-300x135.jpg 300w, https:\/\/www.framesbuy.com.au\/trends\/wp-content\/uploads\/2019\/07\/contact-lens-prescription-768x346.jpg 768w, https:\/\/www.framesbuy.com.au\/trends\/wp-content\/uploads\/2019\/07\/contact-lens-prescription-380x171.jpg 380w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Base Curve (BC)<\/strong> &#8211; It is prescribed to ensure the lenses fit perfectly and comfortably on the cornea. The measurement is determined to match the curvature of the cornea. The measurement is generally in millimeters and sometimes it can also be in words like flat, steep, median.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Diameter (DIA)<\/strong> &#8211; It is the width of the lens from one end to another. This measurement is important to make sure the lens best fits your eye. Diameter is also calculated in millimeters.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Sphere (SPH)<\/strong> &#8211; The figure in this section indicates the power of the lenses. It indicates whether you are <a href=\"https:\/\/www.framesbuy.com.au\/trends\/nearsighted-vs-farsighted\/-vs-farsighted\/\/\">nearsighted or farsighted<\/a>. The figure with + (addition) sign indicates that you are farsighted (hyperopia) and the number beginning with &#8211; (minus) sign indicates that you are nearsighted (myopia). Sometimes Sphere is also determined as Power (PWR) or Dioptre (D) on prescription. The measurement is in dioptres.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Cylinder (CYL)<\/strong> &#8211; Cylinder is indicated when a person requires lens for astigmatism. The figure is always preceded with a &#8211; (minus) sign showing the amount of astigmatism. Toric lenses are recommended for correcting astigmatism.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Axis (AXI)<\/strong> &#8211; It is expressed in degree and always ranges between 1 &#8211; 180. Even Axis is required for astigmatism contact lenses. It indicates the angle of correction that is necessary to view clearly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Addition (ADD)<\/strong> &#8211; If a person suffers from presbyopia, ADD figure determines the number to see clearly at reading distance. It\u2019s a positive number ranging between 0.50 &#8211; 3.00.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Pupillary Distance (PD)<\/strong> &#8211; It is the distance between the centre of one pupil to the centre of other Pupil. Visit <a href=\"https:\/\/www.framesbuy.com.au\/page\/measure-your-pupillary-distance\" target=\"_blank\" rel=\"noreferrer noopener\">Measure your pupillary distance<\/a> to know more.<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h5 class=\"wp-block-heading h4color\">Does contact lens prescription expire?<br><\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">Just like any medical product prescriptions, even contact lenses prescription expires.&nbsp;<br><\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\"><b>FDA considers contact lenses as a medical device. Hence, in 2004 a law was passed that set contact lens prescriptions expire date at one year or the minimum required by state law, whichever is greater.<\/b><br><\/p>\n<cite>&#8211; Food and Drug Administration (US)<\/cite><\/blockquote>\n\n\n\n<h5 class=\"wp-block-heading h4color\">Are contact lenses uncomfortable?<br><\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">No, not really. In fact, after a brief period, your eyes get used to contacts and you won\u2019t even notice you are wearing them.&nbsp;<br><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The law says without valid contact lens prescription, you cannot buy contact lenses from store, online or by mail. <br><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ill-fitting contact lenses cause discomfort or eye infection and to the worse case can even damage your eyes permanently. So it is always wise to buy contact lenses as per prescription and enjoy clear and optimum vision.<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity is-style-wide\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">FAQs<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Can I use my glasses prescription for contact lenses?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">No, glasses and contact lens prescriptions are different. Contact lenses sit directly on the cornea additional measurements are needed for a proper fit.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Why do I need a prescription, for contact lenses?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">A prescription ensures that your lenses provide the vision correction and fit safely on your eyes. The wrong lenses can cause discomfort, infections or eye damage.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>What do BC and DIA mean on a contact lens prescription?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">BC or Base Curve measures the curvature of the lens to match your cornea while DIA or Diameter measures the width of the lens. Both help ensure an secure fit.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>What does SPH mean on a contact lens prescription?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">SPH or Sphere indicates the lens power needed to correct vision. A positive value usually corrects farsightedness while a negative value corrects nearsightedness.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>What do CYL and Axis mean for contact lenses?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">CYL or Cylinder and Axis are used for astigmatism correction. CYL shows the amount of correction needed while Axis indicates the angle of that correction.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>How long does a contact lens prescription last?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Contact lens prescriptions have an expiry period. Need regular updates. The exact validity depends on regulations and eye care requirements.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Are contact lenses uncomfortable to wear?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Contact lenses may feel unusual at first. Most people adjust after a short period. Fitted lenses should feel comfortable and provide clear vision.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Can wearing the wrong contact lenses damage eyes?<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Yes, incorrect lens power or fitting lenses can cause irritation, infections and other eye problems. Always use lenses recommended by an eye care professional.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Key Takeaways Contact lenses no longer serve as just a fashion accessory. More than half of the world population wear contact lenses and millions out there wear for vision correction purpose. However, you cannot just pick any contacts and expect to see clearly. There is no such thing as one size fits all in contact [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1084,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_uag_custom_page_level_css":"","advgb_blocks_editor_width":"","advgb_blocks_columns_visual_guide":"","footnotes":""},"categories":[5],"tags":[],"class_list":["post-865","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-guide"],"blocksy_meta":{"styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":7}},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Contact Lens Prescription Guide | Framesbuy AU<\/title>\n<meta name=\"description\" content=\"Understand contact lens prescriptions, including BC, DIA, SPH, CYL, and more for safe, comfortable, and clear vision correction.\" \/>\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.framesbuy.com.au\/trends\/understand-your-contact-lens-prescription\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Contact Lens Prescription Guide | Framesbuy AU\" \/>\n<meta property=\"og:description\" content=\"Understand contact lens prescriptions, including BC, DIA, SPH, CYL, and more for safe, comfortable, and clear vision correction.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.framesbuy.com.au\/trends\/understand-your-contact-lens-prescription\/\" \/>\n<meta property=\"og:site_name\" content=\"Framesbuy Blog - 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