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While it may seem more complex on the surface, placing an order  with lensmart is as easy as buying anything else over the Internet.","How to Order Glasses Online","https://image.lensmartonline.com/2025-03-13/1741850666666457.jpg","how-to-buy-prescription-eyeglasses-online","How To Buy Prescription Eyeglasses Online","2025-03-06 10:36:08",{"id":790,"type_id":77,"sort":133,"desc":791,"title":792,"img_alt":347,"img":793,"f_title":408,"url_title":794,"label":347,"author":777,"head_title":795,"head_description":791,"head_keywords":347,"create_time":796,"goto_url":797},467,"Want to know what makes some eye colors so rare? Get fascinating insights into unique eye colors and their origins in this comprehensive guide.","What Are the Rarest Eye Colors in the World?","https://image.lensmartonline.com/2025-02-25/1740461258763220.jpg","worlds-rarest-eye-colors-explained","Rare Eye Colors Guide: Beyond Brown, Blue, and Green","2025-02-25 13:28:40","/blog/eyeglasses-online-buying-guide-blog/details/worlds-rarest-eye-colors-explained/",{"id":799,"type_id":77,"sort":56,"desc":800,"title":801,"img_alt":347,"img":802,"f_title":408,"url_title":803,"label":347,"author":347,"head_title":804,"head_description":800,"head_keywords":347,"create_time":805,"goto_url":806},991,"Eyeglass chains have evolved into functional jewelry. Master the art of styling metal, pearl, and beaded chains to elevate your everyday outfits seamlessly.","Eyeglass Chains in 2026: Styles, How to Wear Them, and How to Choose","https://image.lensmartonline.com/product/2026-04-08/1775630971681109.jpg","eyeglass-chains-functional-jewelry-trend","3 Ways Eyeglass Chains Upgrade Your Outfit in 2026","2026-04-08 14:56:26","/blog/eyeglasses-online-buying-guide-blog/details/eyeglass-chains-functional-jewelry-trend/",{"type":808,"list":811,"url":822},{"p_type":809,"pp_type":810},{"id":188,"title":738,"pid":279,"head_title":347,"head_description":347,"head_keywords":347,"url_title":734,"list_title":408,"list_comment":347,"pc_img":347,"wap_img":347},{"id":194,"title":738,"pid":188,"head_title":347,"head_description":347,"head_keywords":347,"url_title":734,"list_title":738,"list_comment":347,"pc_img":347,"wap_img":347},{"id":812,"type_id":194,"sort":279,"desc":813,"title":814,"img_alt":814,"img":815,"f_title":408,"url_title":816,"label":347,"author":347,"content":817,"head_title":818,"head_description":819,"head_keywords":347,"create_time":820,"status":5,"is_tj":279,"desclang":821,"head_canonical":347,"author_id":279,"author_img":347,"author_role":347,"author_content":347},876,"Explains the physics of stress on drill-mount glasses and compares Polycarbonate vs Trivex materials for durable, safe rimless eyewear.","Why Standard Lenses Crack in Rimless Frames: The CR-39 Risk","https://image.lensmartonline.com/product/2026-04-29/1777434247169609.png","why-lenses-crack-rimless-frames-cr39-risk","\u003Ch2 style=\"margin: 30px 0 20px 0\">The TL;DR: Why Your Rimless Glasses Cracked\u003C/h2>\u003Cp>Rimless glasses offer a sleek, minimalist look, but they come with a critical requirement: the right lens material. If your lenses have cracked around the mounting points, it's almost certainly because they were made from standard CR-39 plastic. This material is too brittle to handle the focused stress of a drill-mount frame.\u003C/p>\u003Cul class=\" list-paddingleft-2\">\u003Cli>\u003Cp>\u003Cstrong>The Problem:\u003C/strong> Standard CR-39 plastic lacks the flexibility and impact resistance needed for rimless styles. All the pressure from the frame's arms is concentrated on the small drill holes, causing cracks to form.\u003C/p>\u003C/li>\u003Cli>\u003Cp>\u003Cstrong>The Solution:\u003C/strong> Rimless and semi-rimless frames require lenses made from impact-resistant materials like Polycarbonate or Trivex. These materials can flex under stress without fracturing.\u003C/p>\u003C/li>\u003Cli>\u003Cp>\u003Cstrong>The Takeaway:\u003C/strong> Choosing Polycarbonate or Trivex for your rimless glasses isn't an upgrade—it's a structural necessity for durability and safety.\u003C/p>\u003C/li>\u003C/ul>\u003Ch2 style=\"margin: 30px 0 20px 0\">Understanding the Forces at Play: Full-Frame vs. Rimless\u003C/h2>\u003Cp>To understand why some lenses fail, we first need to appreciate how different frame styles support them. The design of the frame fundamentally changes the physical stress placed on a lens.\u003C/p>\u003Ch3 style=\"margin: 15px 0 10px 0\">How a Full Frame Protects Your Lenses\u003C/h3>\u003Cp>In a traditional full-frame design, the lens is cushioned and supported along its entire edge. The frame material—be it acetate, metal, or titanium—absorbs the vast majority of the stress from daily wear. When you take your glasses on and off, the frame flexes, not the lens. This design evenly distributes pressure, making it a very stable and forgiving system for virtually any lens material.\u003C/p>\u003Ch3 style=\"margin: 15px 0 10px 0\">The Structural Demands of a Rimless Frame\u003C/h3>\u003Cp>A rimless frame is an entirely different engineering challenge. The lenses are not just for vision; they become a critical part of the frame's structure. The bridge and temples are mounted directly onto the lenses with screws or compression plugs.\u003C/p>\u003Cp>This means every time you handle your glasses, the force is transferred directly to the two or three small drill holes in each lens. These points become extreme stress concentrators. Instead of being spread across a wide perimeter, all the torsional and flexing forces are focused on these tiny areas. This is why material choice is not just important; it's everything.\u003C/p>\u003Cp>\u003Cimg alt=\"A diagram comparing the even distribution of pressure on a lens in a full frame versus the concentrated stress points on a lens in a rimless, drill-mount frame.\" src=\"https://image.lensmartonline.com/095c8202601280900095099.png?imageView2/2/interlace/1/ignore-error/1/format/webp\" style=\"width: auto; height: auto; display: block; margin: 1rem auto;\"/>\u003C/p>\u003Ch2 style=\"margin: 30px 0 20px 0\">The Wrong Material: Why CR-39 Plastic Fails\u003C/h2>\u003Cp>For decades, CR-39 has been the workhorse of the optical industry. It's affordable, lightweight, and offers excellent optical clarity. For a full-frame pair of glasses, it's a perfectly suitable choice. However, its physical properties make it uniquely unsuited for the demands of a rimless design.\u003C/p>\u003Ch3 style=\"margin: 15px 0 10px 0\">The Fatal Flaw: Brittleness\u003C/h3>\u003Cp>The primary weakness of CR-39 is its rigidity. It's a relatively brittle plastic with low tensile strength, meaning it doesn't bend or flex well under pressure. When an optician drills into a CR-39 lens to create a mounting hole, they are introducing a weak point. Over time, the constant, tiny flexing motions of putting on and taking off your glasses will cause microscopic fractures around these holes to grow. Eventually, a visible crack appears, often spiderwebbing out from the screw or plug.\u003C/p>\u003Cp>From our own repair-bench observations, this type of failure is the single most common issue with improperly made rimless eyewear, typically occurring within the first 3 to 6 months of wear.\u003C/p>\u003Ch3 style=\"margin: 15px 0 10px 0\">The Astigmatism Accelerator\u003C/h3>\u003Cp>This problem is often worse for people with a significant astigmatism correction (indicated as the "cylinder" or "CYL" value in a prescription). Astigmatism correction creates uneven thickness across the lens surface. This can result in the lens being dangerously thin at the exact point where a drill hole is needed. As a practical rule of thumb in the optical field, CR-39 should never be used in a drill-mount frame if the lens will be less than 2.0mm thick at its thinnest point.\u003C/p>\u003Cp>\u003Cimg alt=\"A dramatic macro photograph showing a hairline crack spiderwebbing out from a drill-mount hole on a spectacle lens.\" src=\"https://image.lensmartonline.com/4036d202601280859536286.png?imageView2/2/interlace/1/ignore-error/1/format/webp\" style=\"width: auto; height: auto; display: block; margin: 1rem auto;\"/>\u003C/p>\u003Ch2 style=\"margin: 30px 0 20px 0\">The Right Solution: High-Impact Lens Materials\u003C/h2>\u003Cp>To prevent structural failure, rimless and semi-rimless frames must be fitted with lenses made from materials designed to withstand high stress. In the United States, all spectacle lenses must meet a standard for impact resistance set by the FDA (under regulation 21 CFR 801.410), but Polycarbonate and Trivex go far beyond this baseline.\u003C/p>\u003Ch3 style=\"margin: 15px 0 10px 0\">Polycarbonate: The Gold Standard for Safety\u003C/h3>\u003Cp>Polycarbonate is a high-tech plastic that is significantly more flexible and shatter-resistant than CR-39. It was originally developed for aerospace applications and is the same material used for bullet-resistant glass and safety goggles.\u003C/p>\u003Cul class=\" list-paddingleft-2\">\u003Cli>\u003Cp>\u003Cstrong>Pros:\u003C/strong> Its main advantage is its incredible tensile strength and impact resistance, making it nearly impossible to crack at the mounting points. It's also thinner and lighter than CR-39 and has built-in 100% UV protection. For more on this, see our guide on \u003Ca href=\"https://www.lensmartonline.com/blog/glasses-lifestyle-guides/details/polycarbonate-lenses-uv-safety\" target=\"_blank\">Polycarbonate Lenses: Do They Have Built-In UV Safety?\u003C/a>.\u003C/p>\u003C/li>\u003Cli>\u003Cp>\u003Cstrong>Cons:\u003C/strong> The one trade-off is slightly lower optical clarity. Polycarbonate has a low Abbe value, which can cause some people to see "chromatic aberration," or color fringes, in their peripheral vision. This is most noticeable in very high prescriptions.\u003C/p>\u003C/li>\u003C/ul>\u003Ch3 style=\"margin: 15px 0 10px 0\">Trivex: The Best of Both Worlds\u003C/h3>\u003Cp>Trivex is a newer material that was originally developed for military helicopter windshields. It combines the safety of Polycarbonate with the optical quality of CR-39.\u003C/p>\u003Cul class=\" list-paddingleft-2\">\u003Cli>\u003Cp>\u003Cstrong>Pros:\u003C/strong> Trivex offers superior optical clarity with a high Abbe value, eliminating the risk of chromatic aberration. It is also incredibly durable and impact-resistant, and it's the lightest of all available lens materials.\u003C/p>\u003C/li>\u003Cli>\u003Cp>\u003Cstrong>Cons:\u003C/strong> It is slightly thicker than Polycarbonate and is typically the most expensive lens material option.\u003C/p>\u003C/li>\u003C/ul>\u003Ch3 style=\"margin: 15px 0 10px 0\">Material Comparison Chart\u003C/h3>\u003Cdiv style=\"width: 100%; overflow-x: auto;\">\u003Ctable style=\"border-collapse: collapse; width: 100%;\">\u003Cthead>\u003Ctr>\u003Cth style=\"border: 1px solid #000; padding: 8px 12px; background-color: #f5f5f5; text-align: left;\">Feature\u003C/th>\u003Cth style=\"border: 1px solid #000; padding: 8px 12px; background-color: #f5f5f5; text-align: left;\">CR-39 Plastic\u003C/th>\u003Cth style=\"border: 1px solid #000; padding: 8px 12px; background-color: #f5f5f5; text-align: left;\">Polycarbonate\u003C/th>\u003Cth style=\"border: 1px solid #000; padding: 8px 12px; background-color: #f5f5f5; text-align: left;\">Trivex\u003C/th>\u003C/tr>\u003C/thead>\u003Ctbody>\u003Ctr>\u003Ctd style=\"border: 1px solid #000; padding: 8px 12px;\">\u003Cstrong>Impact Resistance\u003C/strong>\u003C/td>\u003Ctd style=\"border: 1px solid #000; padding: 8px 12px;\">Low\u003C/td>\u003Ctd style=\"border: 1px solid #000; padding: 8px 12px;\">Excellent\u003C/td>\u003Ctd style=\"border: 1px solid #000; padding: 8px 12px;\">Excellent\u003C/td>\u003C/tr>\u003Ctr>\u003Ctd style=\"border: 1px solid #000; padding: 8px 12px;\">\u003Cstrong>Optical Clarity (Abbe Value)\u003C/strong>\u003C/td>\u003Ctd style=\"border: 1px solid #000; padding: 8px 12px;\">Excellent (58)\u003C/td>\u003Ctd style=\"border: 1px solid #000; padding: 8px 12px;\">Good (30)\u003C/td>\u003Ctd style=\"border: 1px solid #000; padding: 8px 12px;\">Excellent (43-45)\u003C/td>\u003C/tr>\u003Ctr>\u003Ctd style=\"border: 1px solid #000; padding: 8px 12px;\">\u003Cstrong>Best for Rimless Frames\u003C/strong>\u003C/td>\u003Ctd style=\"border: 1px solid #000; padding: 8px 12px;\">No\u003C/td>\u003Ctd style=\"border: 1px solid #000; padding: 8px 12px;\">\u003Cstrong>Yes\u003C/strong>\u003C/td>\u003Ctd style=\"border: 1px solid #000; padding: 8px 12px;\">\u003Cstrong>Yes (Recommended)\u003C/strong>\u003C/td>\u003C/tr>\u003Ctr>\u003Ctd style=\"border: 1px solid #000; padding: 8px 12px;\">\u003Cstrong>Built-in UV Protection\u003C/strong>\u003C/td>\u003Ctd style=\"border: 1px solid #000; padding: 8px 12px;\">No (Requires Coating)\u003C/td>\u003Ctd style=\"border: 1px solid #000; padding: 8px 12px;\">Yes\u003C/td>\u003Ctd style=\"border: 1px solid #000; padding: 8px 12px;\">Yes\u003C/td>\u003C/tr>\u003Ctr>\u003Ctd style=\"border: 1px solid #000; padding: 8px 12px;\">\u003Cstrong>Weight\u003C/strong>\u003C/td>\u003Ctd style=\"border: 1px solid #000; padding: 8px 12px;\">Standard\u003C/td>\u003Ctd style=\"border: 1px solid #000; padding: 8px 12px;\">Lightest\u003C/td>\u003Ctd style=\"border: 1px solid #000; padding: 8px 12px;\">Lighter\u003C/td>\u003C/tr>\u003Ctr>\u003Ctd style=\"border: 1px solid #000; padding: 8px 12px;\">\u003Cstrong>Price\u003C/strong>\u003C/td>\u003Ctd style=\"border: 1px solid #000; padding: 8px 12px;\">$\u003C/td>\u003Ctd style=\"border: 1px solid #000; padding: 8px 12px;\">$$\u003C/td>\u003Ctd style=\"border: 1px solid #000; padding: 8px 12px;\">$$$\u003C/td>\u003C/tr>\u003C/tbody>\u003C/table>\u003C/div>\u003Ch2 style=\"margin: 30px 0 20px 0\">Fit and Handling: The Final Piece of the Puzzle\u003C/h2>\u003Cp>Even with the right material, the longevity of your rimless glasses depends on a proper fit and careful handling.\u003C/p>\u003Cp>An ill-fitting frame can introduce unnecessary stress. If the temples are too tight against your head, they will constantly exert outward pressure on the lens mountings, which can lead to failure over time.\u003C/p>\u003Cp>Proper handling is also crucial. Always use two hands to put on and take off your glasses. This prevents you from accidentally twisting one side, which puts immense torque on the mounting points. Store them in a rigid case when not in use to protect them from being crushed or bent.\u003C/p>\u003Ch2 style=\"margin: 30px 0 20px 0\">Frequently Asked Questions\u003C/h2>\u003Cp>\u003Cstrong>Can I put a strong prescription in rimless frames?\u003C/strong>Yes, you can. However, it is even more critical to use a high-index version of Polycarbonate or Trivex to keep the lenses as thin and light as possible, which reduces stress on the mounts. For a deeper dive, read our article on if you can \u003Ca href=\"https://www.lensmartonline.com/blog/glasses-lifestyle-guides/details/strong-prescription-rimless-glasses\" target=\"_blank\">use a strong prescription with rimless frames\u003C/a>.\u003C/p>\u003Cp>\u003Cstrong>Are Trivex lenses worth the extra cost for my rimless glasses?\u003C/strong>For most wearers, yes. The combination of superior optical clarity and high impact resistance makes Trivex the ideal material for a frame style that relies so heavily on its lenses for structural integrity. You get durability without compromising on visual quality.\u003C/p>\u003Cp>\u003Cstrong>Why didn't my last pair of rimless glasses crack?\u003C/strong>It's very likely they were made with Polycarbonate or Trivex lenses. An optician following best practices would automatically select one of these materials for any drill-mount or semi-rimless frame.\u003C/p>\u003Cp>Ultimately, rimless glasses are a fantastic choice for a modern, lightweight feel. But they are an engineered system. Pairing them with an impact-resistant lens is not a mere suggestion—it's the fundamental requirement for ensuring they last.\u003C/p>\u003Chr/>\u003Cp>\u003Cem>Disclaimer: This article is for informational purposes only and does not constitute medical advice. Consult with a qualified eye care professional for any questions regarding your vision or eyewear needs.\u003C/em>\u003C/p>","Why Standard Lenses Crack in Rimless Frames","A guide explaining why rimless frame designs cause standard lenses to crack, detailing stress concentration and essential durable materials for safety.","2026-01-28 09:00:16","{\"en\":\"Explains the physics of stress on drill-mount glasses and compares Polycarbonate vs Trivex materials for durable, safe rimless eyewear.\",\"fr\":\"\",\"es\":\"\",\"de\":\"\",\"hu\":\"\",\"pt\":\"\",\"sk\":\"\"}","/glasses-lifestyle-guides/details/why-lenses-crack-rimless-frames-cr39-risk/"]