{"id":16169,"date":"2026-02-12T09:47:24","date_gmt":"2026-02-12T09:47:24","guid":{"rendered":"https:\/\/www.eyecliniclondon.com\/blog\/?p=16169"},"modified":"2026-02-12T10:25:53","modified_gmt":"2026-02-12T10:25:53","slug":"istent-for-glaucoma","status":"publish","type":"post","link":"https:\/\/www.eyecliniclondon.com\/blog\/istent-for-glaucoma\/","title":{"rendered":"iStent for Glaucoma: How It Works and Who Benefits Most (Guide)"},"content":{"rendered":"<p><span style=\"font-weight: 400;\">When you are diagnosed with glaucoma, eye drops are usually the first treatment discussed. We now have access to smaller and less invasive surgical options as technology has progressed. One of the most widely recognised devices in this category is the iStent.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">You may have heard the name yet remain unsure about its purpose. We often find that patients question whether it replaces drops, whether it involves major surgery, or whether it is reserved for severe disease. Clear explanations make these choices easier to navigate.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">You should understand that the device is designed to improve the eye\u2019s natural drainage rather than cure glaucoma. We position it within a broader treatment pathway that may still include medication or additional procedures. Its role depends on your specific pressure targets and disease stage.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">In this guide, we outline how the device works, when it is recommended and which patients are most likely to benefit. You gain clarity about where it fits within modern glaucoma care. We aim to help you see how it may form part of your long-term management strategy.<\/span><\/p>\n<h2><b>What Is the iStent?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The iStent is a tiny medical device used in glaucoma surgery. It belongs to a category called minimally invasive glaucoma surgery, often referred to as MIGS. These procedures are designed to lower eye pressure with less disruption than traditional surgery.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The device itself is extremely small and is inserted into the eye\u2019s natural drainage system. Its purpose is to improve fluid outflow from the eye. By enhancing drainage, it helps reduce intraocular pressure.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Unlike larger glaucoma operations, the iStent does not involve creating a new external drainage channel. Instead, it works within the eye\u2019s existing pathway.<\/span><\/p>\n<h2><b>Why Lowering Eye Pressure Is Essential<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Glaucoma affects the optic nerve gradually, often without obvious early symptoms. You may not notice changes until significant damage has occurred. Clear understanding of treatment goals helps you focus on long-term protection rather than short-term fixes.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Nature of Glaucoma Damage: <\/b><span style=\"font-weight: 400;\">Elevated eye pressure commonly leads to optic nerve injury. Damage progresses slowly and is usually irreversible.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Importance of Pressure Reduction:<\/b><span style=\"font-weight: 400;\"> Lowering pressure is the only proven way to slow progression. Even moderate reductions can protect your long-term vision.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>When Surgery Is Considered:<\/b><span style=\"font-weight: 400;\"> If drops are insufficient or difficult to tolerate, other options may be explored. The iStent may offer additional pressure control for selected patients.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">The aim of treatment is stability rather than cure. We focus on preserving the vision you have and preventing further nerve damage. Careful discussion ensures you understand why each step is recommended and how it supports your long-term eye health.<\/span><\/p>\n<h2><b>How Fluid Normally Drains from the Eye<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Your eye continually produces aqueous humour, a clear fluid that nourishes internal structures. You have this fluid flowing from behind the iris into the anterior chamber at the front of the eye. We explain that it normally drains through the trabecular meshwork to maintain balanced pressure.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">In open-angle glaucoma, this drainage tissue becomes less efficient. You experience increased resistance, which leads to rising pressure within the eye. We recognise that sustained elevation can gradually affect the optic nerve if not controlled.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The iStent is designed to bypass the area of greatest resistance. You benefit from a direct microscopic channel that improves access to the natural drainage pathway. We aim to support freer fluid flow and stabilise pressure more effectively.<\/span><\/p>\n<h2><b>How the iStent Works<\/b><\/h2>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-16191\" src=\"https:\/\/www.eyecliniclondon.com\/blog\/wp-content\/uploads\/2026\/02\/4-13.jpg\" alt=\"\" width=\"1100\" height=\"600\" \/><\/p>\n<p><span style=\"font-weight: 400;\">The iStent is positioned within the trabecular meshwork to form a microscopic channel. You gain improved access to Schlemm\u2019s canal, which plays a key role in natural fluid drainage. We aim to enhance outflow and lower pressure through this targeted pathway.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Because the device works within your existing drainage system, your eye continues to function in a physiological manner. You do not have fluid redirected outside the eye. We focus instead on restoring more efficient internal circulation.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The objective is to achieve a modest yet clinically meaningful reduction in pressure. You should understand that it is not designed for very advanced or rapidly progressive glaucoma. We select this option carefully based on the severity of your condition.<\/span><\/p>\n<h2><b>When Is the iStent Usually Performed?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The iStent is most often inserted during cataract surgery. You avoid the need for a separate operation when both procedures are combined. We also make use of the same surgical access that is already created for lens removal.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">In certain cases, you may have more than one stent placed to improve pressure control. We find that adding the device usually extends the operation only slightly. Your recovery is typically similar to that expected after cataract surgery alone.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">It is uncommon for the device to be implanted as a standalone procedure without cataract surgery. You are assessed individually based on disease stage and pressure targets. We determine suitability carefully to ensure that your treatment plan remains appropriate and effective.<\/span><\/p>\n<h2><b>Who Benefits Most from the iStent?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The iStent is generally most suitable if you have mild to moderate open-angle glaucoma. You may benefit particularly when pressure is not fully controlled with one or two medications. We also consider it if you find daily drop routines difficult to maintain consistently.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">You are often an ideal candidate if you are already planning cataract surgery and also have glaucoma. We can address lens opacity and support pressure reduction within the same procedure. Combining treatments may simplify your overall care pathway.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">If you have advanced glaucoma requiring very low target pressures, this approach is not usually recommended. You may require a more intensive surgical option to achieve adequate control. We assess disease severity carefully to ensure the most appropriate strategy for your situation.<\/span><\/p>\n<h2><b>How Much Pressure Reduction Can Be Expected?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Managing glaucoma often involves combining different strategies to achieve safe pressure control. The iStent is designed to support this goal by enhancing the eye\u2019s natural drainage. Clear discussion beforehand ensures your expectations remain realistic and well informed.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Expected Pressure Reduction: <\/b><span style=\"font-weight: 400;\">The iStent typically provides a moderate reduction in intraocular pressure. The degree of improvement varies between individuals.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Role Alongside Medication:<\/b><span style=\"font-weight: 400;\"> It is often intended to supplement rather than fully replace medical therapy. Some patients reduce drops, while others continue at lower doses.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Defining Treatment Success:<\/b><span style=\"font-weight: 400;\"> Your individual target pressure determines whether outcomes are satisfactory. Expectations and goals are discussed clearly before surgery.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">By aligning treatment with your specific pressure target, we focus on long-term stability rather than short-term change. Careful planning helps reduce treatment burden while maintaining control. Ongoing monitoring ensures that your pressure remains within a safe range over time.<\/span><\/p>\n<h2><b>Advantages of MIGS Compared to Traditional Surgery<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Traditional glaucoma operations such as Trabeculectomy create a new drainage pathway to lower eye pressure. You should understand that, although highly effective, these procedures involve greater risk and a longer recovery period. We often compare them with minimally invasive glaucoma surgery, which aims to reduce disruption to natural structures.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The iStent has a favourable safety profile in suitable patients. You benefit from the fact that it works within your eye\u2019s natural drainage anatomy. We generally see fewer and milder complications, along with a quicker recovery.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">However, you should recognise that pressure reduction may be more modest compared with more aggressive surgery. We assess disease severity carefully before recommending any approach. Suitability depends on how advanced your glaucoma is and what level of pressure control you require.<\/span><\/p>\n<h2><b>Potential Risks and Limitations<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Although described as minimally invasive, the iStent remains a surgical implant. You should be aware of potential risks such as minor bleeding, temporary pressure fluctuations or device malposition. We emphasise that serious complications are uncommon but still discussed transparently.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">You may not achieve the desired pressure reduction in every case. We sometimes find that additional treatment is required later to maintain safe control. The device helps manage glaucoma but does not cure the condition.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">When you understand these limitations, you avoid unrealistic expectations. We present the implant as one component within a broader, structured management plan. Clear perspective allows you to approach treatment decisions with confidence and balance.<\/span><\/p>\n<h2><b>Does the iStent Replace Eye Drops Completely?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Some patients are able to reduce or stop one or more glaucoma medications after implantation. You should understand, however, that complete freedom from drops cannot be guaranteed. We see outcomes vary according to individual response and underlying disease severity.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The aim is often to lessen your medication burden rather than remove it entirely. You may find that using fewer drops improves comfort and makes daily routines easier to maintain. We recognise that better adherence supports more stable long-term pressure control.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">After surgery, your ophthalmologist will continue to monitor your eye pressure carefully. You can expect treatment to be adjusted if required to maintain safe levels. We ensure that structured follow-up remains a central part of your ongoing care.<\/span><\/p>\n<h2><b>Long-Term Monitoring After iStent<\/b><\/h2>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-16188\" src=\"https:\/\/www.eyecliniclondon.com\/blog\/wp-content\/uploads\/2026\/02\/7-4.jpg\" alt=\"\" width=\"1100\" height=\"600\" \/><\/p>\n<p><span style=\"font-weight: 400;\">Even after a successful implant, ongoing glaucoma monitoring remains essential. You will still require regular pressure checks, optic nerve imaging and visual field assessments. We emphasise that the device supports control but does not remove the need for continued surveillance.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Glaucoma is a lifelong condition that demands structured and consistent oversight. You benefit from early detection of any change, allowing timely adjustment of treatment. We maintain careful follow-up to protect your long-term visual health.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The iStent becomes one component of your overall management plan rather than the final stage. You continue along a monitored pathway designed to preserve stability. We ensure that each step supports sustained pressure control and optic nerve protection.<\/span><\/p>\n<h2><b>Is the iStent Suitable for Everyone with Glaucoma?<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">Glaucoma management requires careful selection of the most appropriate treatment for you. While minimally invasive glaucoma surgery can be highly effective in suitable cases, it is not appropriate for every type of glaucoma. Thorough assessment ensures that any procedure recommended offers real and meaningful benefit.<\/span><\/p>\n<ul>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Variation Between Glaucoma Types: <\/b><span style=\"font-weight: 400;\">Not all forms of glaucoma respond equally to minimally invasive surgery. Closed-angle glaucoma or very advanced disease may not benefit from this approach.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Anatomical Suitability: <\/b><span style=\"font-weight: 400;\">The eye\u2019s drainage system must be accessible for safe implantation. Detailed examination confirms whether the necessary structures are suitable.<\/span><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><b>Individualised Treatment Planning: <\/b><span style=\"font-weight: 400;\">Careful evaluation determines whether the device will provide genuine pressure control. Surgery is advised only when it offers clear clinical advantage for you.<\/span><\/li>\n<\/ul>\n<p><span style=\"font-weight: 400;\">By tailoring treatment to your specific condition, we prioritise both safety and effectiveness. Thoughtful planning ensures that intervention is chosen for benefit rather than convenience. Clear explanation helps you feel confident in the decisions made about your care.<\/span><\/p>\n<h2><b>Discussing Your Options<\/b><\/h2>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-15985\" src=\"https:\/\/www.eyecliniclondon.com\/blog\/wp-content\/uploads\/2026\/02\/43-1.jpg\" alt=\"\" width=\"1100\" height=\"600\" \/><\/p>\n<p><span style=\"font-weight: 400;\">If you are exploring glaucoma treatment options, a thorough consultation forms the foundation of safe care. We explain that every intervention carries its own advantages and limitations. The iStent represents one option within a broader spectrum that includes eye drops, laser procedures and traditional surgery.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">When discussing glaucoma treatment in London, we carefully assess your target eye pressure, the stage of your condition and your daily lifestyle demands. You receive a plan tailored to your individual needs rather than a standardised approach. Personalisation ensures that treatment aligns with both medical priorities and practical realities.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">When you make informed decisions, you strengthen your long-term outcomes. We prioritise clear explanations so you understand why a particular pathway is recommended. Confidence grows when you feel fully informed and actively involved in your care.<\/span><\/p>\n<h2><b>FAQs:<\/b><\/h2>\n<ol>\n<li><b> What type of glaucoma is the iStent most suitable for?<\/b><b><br \/>\n<\/b><span style=\"font-weight: 400;\"> You are most likely to benefit if you have mild to moderate open-angle glaucoma. We assess whether your drainage angle is accessible and whether your pressure target is achievable with a modest reduction. It is not usually recommended for advanced or closed-angle glaucoma.<\/span><\/li>\n<li><b> Is the iStent considered major surgery?<\/b><b><br \/>\n<\/b><span style=\"font-weight: 400;\"> You do not undergo major external surgery with this procedure. We implant the device through the same small incision used in cataract surgery, without creating a new drainage channel outside the eye. Recovery is typically similar to standard cataract surgery.<\/span><\/li>\n<li><b> Can you have the iStent without cataract surgery?<\/b><b><br \/>\n<\/b><span style=\"font-weight: 400;\"> You can have it as a standalone procedure in selected cases, but it is most commonly performed alongside cataract surgery. We often recommend combining them because it avoids a second operation. Suitability depends on your eye health and treatment goals.<\/span><\/li>\n<li><b> How long does the iStent last?<\/b><b><br \/>\n<\/b><span style=\"font-weight: 400;\"> You should expect the device to remain in place permanently once implanted. We do not routinely replace it, as it is designed to function long term within your natural drainage system. Ongoing monitoring ensures it continues to support pressure control.<\/span><\/li>\n<li><b> Will you feel the iStent inside your eye?<\/b><b><br \/>\n<\/b><span style=\"font-weight: 400;\"> You will not feel the device once it has been inserted. We position it within the drainage angle where it does not interfere with normal sensation. Most patients are unaware of its presence after surgery.<\/span><\/li>\n<li><b> Does the iStent cure glaucoma?<\/b><b><br \/>\n<\/b><span style=\"font-weight: 400;\"> You should understand that it does not cure glaucoma. We use it to help lower pressure and slow progression, but ongoing monitoring remains essential. Glaucoma is a lifelong condition that still requires structured follow-up.<\/span><\/li>\n<li><b> How soon can you return to normal activities?<\/b><b><br \/>\n<\/b><span style=\"font-weight: 400;\"> You can usually resume light daily activities within a few days, similar to cataract recovery. We advise avoiding heavy lifting or eye strain in the early phase. Follow-up appointments ensure healing is progressing as expected.<\/span><\/li>\n<li><b> What happens if the iStent does not lower pressure enough?<\/b><b><br \/>\n<\/b><span style=\"font-weight: 400;\"> You may still require eye drops or additional procedures if pressure remains above your target. We reassess your response over time and adjust treatment accordingly. The device forms part of your overall management plan, not the final step.<\/span><\/li>\n<li><b> Are there visible signs that you have an iStent?<\/b><b><br \/>\n<\/b><span style=\"font-weight: 400;\"> You will not see the device in the mirror, and others cannot detect it. We can visualise it during examinations using specialised equipment. It remains discreet and does not affect the appearance of your eye.<\/span><\/li>\n<li><b> How do you decide if the iStent is right for you?<\/b><b><br \/>\n<\/b><span style=\"font-weight: 400;\"> You require a detailed assessment of your glaucoma stage, pressure target, and eye anatomy. We evaluate whether the expected pressure reduction aligns with your long-term needs. A personalised discussion ensures the decision reflects both safety and benefit.<\/span><\/li>\n<\/ol>\n<h2><b>Final Thoughts on iStent for Glaucoma:<\/b><\/h2>\n<p><span style=\"font-weight: 400;\">The iStent is a minimally invasive device designed to improve natural fluid drainage and reduce eye pressure in selected glaucoma patients. It is most beneficial for individuals with mild to moderate open-angle glaucoma, particularly when combined with cataract surgery.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Its role is to support long-term pressure control with a favourable safety profile.<\/span><a href=\"https:\/\/www.eyecliniclondon.com\/glaucoma.html\"><span style=\"font-weight: 400;\"> If you are concerned whether <\/span><span style=\"font-weight: 400;\">glaucoma treatment could benefit you<\/span><\/a><span style=\"font-weight: 400;\">, feel free to get in touch with us at Eye Clinic London for personalised care and assessment suitable to your specific needs.<\/span><\/p>\n<h2><b>References:<\/b><\/h2>\n<ol>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Sarkisian SR Jr (2022) Effectiveness and safety of the iStent infinite trabecular micro-bypass system in patients with open-angle glaucoma uncontrolled by prior therapy. Available at: <\/span><a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/36260288\/\"><span style=\"font-weight: 400;\">https:\/\/pubmed.ncbi.nlm.nih.gov\/36260288\/<\/span><\/a><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Neuhann T, Neuhann R, Hornbeak DM (2024) Ten-Year effectiveness and safety of trabecular micro-bypass stent implantation with cataract surgery in glaucoma or ocular hypertension. Available at: <\/span><a href=\"https:\/\/pubmed.ncbi.nlm.nih.gov\/38907091\/\"><span style=\"font-weight: 400;\">https:\/\/pubmed.ncbi.nlm.nih.gov\/38907091\/<\/span><\/a><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Vohra, V., Madgula, I. &amp; Chawla, H. (2025) Real-world assessment of second-generation trabecular micro-bypass stents in open-angle glaucoma patients. Available at: <\/span><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/pii\/S2667376224000556\"><span style=\"font-weight: 400;\">https:\/\/www.sciencedirect.com\/science\/article\/pii\/S2667376224000556<\/span><\/a><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Martini, K. (2024) Intraoperative iStent versus postoperative selective laser trabeculoplasty (SLT) for IOP control: comparative outcomes.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">Available at: <\/span><a href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0181551223004126?utm_source=chatgpt.com\"><span style=\"font-weight: 400;\">\u00a0<\/span><span style=\"font-weight: 400;\">https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0181551223004126<\/span><\/a><\/li>\n<li style=\"font-weight: 400;\" aria-level=\"1\"><span style=\"font-weight: 400;\">Zgry\u017aniak, A. (2021) Selective Laser Trabeculoplasty in the Treatment of Ocular Hypertension and Glaucoma: A Review. Journal of Clinical Medicine, 10(15), 3307.<\/span><span style=\"font-weight: 400;\"><br \/>\n<\/span><span style=\"font-weight: 400;\">Available at: <\/span><a href=\"https:\/\/www.mdpi.com\/2077-0383\/10\/15\/3307?utm_source=chatgpt.com\"><span style=\"font-weight: 400;\">\u00a0<\/span><span style=\"font-weight: 400;\">https:\/\/www.mdpi.com\/2077-0383\/10\/15\/3307<\/span><\/a><\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>When you are diagnosed with glaucoma, eye drops are usually the first treatment discussed. We now have access to smaller and less invasive surgical options as technology has progressed. One of the most widely recognised devices in this category is the iStent. You may have heard the name yet remain unsure about its purpose. We often find that patients question whether it replaces drops, whether it involves major surgery, or whether it is reserved for severe disease. Clear explanations make<\/p>\n","protected":false},"author":28,"featured_media":16197,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-16169","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.4 (Yoast SEO v26.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>iStent for Glaucoma (Guide)<\/title>\n<meta name=\"description\" content=\"The iStent is one of the most well-known MIGS devices, but patients are often unclear about what it actually does. 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