{"id":3161,"date":"2025-08-11T14:35:44","date_gmt":"2025-08-11T14:35:44","guid":{"rendered":"https:\/\/www.londoncataractcentre.co.uk\/blog\/?p=3161"},"modified":"2025-10-08T17:14:42","modified_gmt":"2025-10-08T17:14:42","slug":"asprin-cataract-surgery","status":"publish","type":"post","link":"https:\/\/www.londoncataractcentre.co.uk\/blog\/asprin-cataract-surgery\/","title":{"rendered":"Aspirin Before Cataract Surgery: Stop or Continue?"},"content":{"rendered":"\n
If you take aspirin regularly \u2014 especially a low-dose daily tablet to protect your heart \u2014 you might feel a bit anxious when cataract surgery is on the horizon. You\u2019ve probably heard mixed advice from friends, online forums, or even different doctors. Some people say you should stop aspirin before surgery to prevent bleeding, while others insist you should carry on taking it to reduce your risk of heart attack or stroke.<\/p>\n\n\n\n
So, which is it? Should you stop or continue aspirin before cataract surgery? The answer isn\u2019t as simple as a quick \u201cyes\u201d or \u201cno\u201d \u2014 it depends on why<\/em> you\u2019re taking aspirin, your overall health, the type of surgery you\u2019re having, and your surgeon\u2019s preferences. In this article, we\u2019ll go through what aspirin does, why it\u2019s prescribed, how it interacts with cataract surgery, and what current guidelines suggest. By the end, you\u2019ll feel more confident about having that conversation with your eye surgeon.<\/p>\n\n\n\n
Why Aspirin is Commonly Prescribed<\/strong><\/h2>\n\n\n\n
Aspirin (acetylsalicylic acid) is more than just an over-the-counter painkiller. At low doses \u2014 usually 75mg to 100mg per day \u2014 it works as an antiplatelet medicine. That means it reduces the ability of your blood to clot. This is particularly useful for people who have a high risk of cardiovascular problems such as heart attack, stroke, or blood clot formation.<\/p>\n\n\n\n
Doctors often recommend long-term low-dose aspirin if you\u2019ve had a heart attack, have angina, have undergone heart bypass surgery, have had a stent placed in your arteries, or have a history of stroke or transient ischaemic attack (TIA). In some cases, it\u2019s also given to people with certain heart rhythm problems or high-risk diabetes.<\/p>\n\n\n\n
The aim is straightforward \u2014 to keep your blood \u201cslippery\u201d enough to reduce the chances of clot formation that could block critical arteries. But the very thing that makes aspirin beneficial for your heart can sometimes be a concern for surgeons, because it can slightly increase bleeding during and after operations.<\/p>\n\n\n\n
What Happens During Cataract Surgery<\/strong><\/h2>\n\n\n\n<\/figure>\n\n\n\n
Cataract surgery is one of the most common and successful surgical procedures in the world. In the UK, it\u2019s usually done under local anaesthetic \u2014 meaning you\u2019re awake, but your eye is numbed \u2014 and takes around 10\u201320 minutes. The cloudy lens in your eye is removed and replaced with a clear artificial one.<\/p>\n\n\n\n
The surgical incision is tiny \u2014 often just 2\u20133 millimetres \u2014 and doesn\u2019t usually require stitches. Because the wound is so small and the surgery is minimally invasive, bleeding risk is generally low compared with many other types of surgery. That\u2019s why for many patients, aspirin may not need to be stopped.<\/p>\n\n\n\n
However, there are<\/em> certain situations in cataract surgery where bleeding can be more of a concern, and in those cases, aspirin use is discussed more carefully between the patient, surgeon, and sometimes a cardiologist.<\/p>\n\n\n\n
How Aspirin Affects Surgical Bleeding<\/strong><\/h2>\n\n\n\n
Aspirin affects platelets \u2014 the tiny cells that help your blood clot after injury. By making them less \u201csticky,\u201d aspirin can prolong the time it takes for bleeding to stop. In everyday life, this is usually not a problem. But in surgery, it can theoretically increase the risk of bleeding inside the eye, particularly in areas such as the conjunctiva or the more delicate deeper structures.<\/p>\n\n\n\n
In cataract surgery, the most common bleeding issue linked to aspirin is subconjunctival haemorrhage \u2014 a small bleed under the clear membrane covering the white of the eye. This looks alarming (red patch on the eye) but is almost always harmless and clears within a week or two.<\/p>\n\n\n\n
Serious bleeding inside the eye, such as suprachoroidal haemorrhage, is extremely rare but can be sight-threatening. Some studies have found no significant increase in these risks for cataract patients who continue aspirin, while others suggest a tiny rise in certain bleeding complications.<\/p>\n\n\n\n
What the Research Says About Continuing Aspirin<\/strong><\/h2>\n\n\n\n<\/figure>\n\n\n\n
Multiple studies over the past two decades have looked at whether continuing aspirin increases the risk of complications during cataract surgery. Most have found that the benefits of continuing aspirin \u2014 especially for those with a high cardiovascular risk \u2014 outweigh the small risk of bleeding.<\/p>\n\n\n\n
For example, research in large patient groups has shown that stopping aspirin before cataract surgery can lead to avoidable heart attacks or strokes in at-risk individuals. On the other hand, keeping aspirin going may lead to minor bleeding on the eye surface, but not to serious loss of vision.<\/p>\n\n\n\n
This is why many current ophthalmology guidelines lean towards continuing<\/em> aspirin for routine cataract surgery in most patients, while making exceptions for unusual cases.<\/p>\n\n\n\n
When Your Surgeon Might Recommend Stopping Aspirin<\/strong><\/h2>\n\n\n\n
Although most people are advised to keep taking aspirin before cataract surgery, there are situations where stopping it temporarily may be safer. For example:<\/p>\n\n\n\n
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If you\u2019re on multiple blood-thinning medications<\/strong> \u2013 Combining aspirin with other antiplatelet or anticoagulant drugs (such as clopidogrel or warfarin) may increase bleeding risk.<\/li>\n\n\n\n
If you have a history of bleeding disorders<\/strong> \u2013 Such as haemophilia or severe platelet problems.<\/li>\n\n\n\n
If your surgery is complex<\/strong> \u2013 For example, if you have advanced cataracts, zonular weakness, or a high likelihood of needing a larger incision.<\/li>\n\n\n\n
If you\u2019re undergoing combined eye procedures<\/strong> \u2013 Such as cataract surgery with glaucoma surgery, which can involve more delicate tissues and a higher bleeding risk.<\/li>\n<\/ol>\n\n\n\n
In these cases, your surgeon may work with your GP or cardiologist to decide on the safest course \u2014 sometimes pausing aspirin for a few days before and restarting it soon after.<\/p>\n\n\n\n
The Role of Your Cardiologist or GP<\/strong><\/h2>\n\n\n\n<\/figure>\n\n\n\n
Your ophthalmologist is the expert in eye surgery, but your cardiologist or GP understands your cardiovascular risk better than anyone. If there\u2019s any uncertainty about whether you should stop aspirin before cataract surgery, your eye surgeon will often consult your medical team.<\/p>\n\n\n\n
They\u2019ll weigh up:<\/p>\n\n\n\n
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The reason you\u2019re on aspirin in the first place.<\/li>\n\n\n\n
How long you\u2019ve been taking it.<\/li>\n\n\n\n
The risk of bleeding versus the risk of a cardiovascular event if you stop it.<\/li>\n<\/ul>\n\n\n\n
This collaborative approach ensures you get the safest outcome for both your eyes and your overall health.<\/p>\n\n\n\n
Timing If Aspirin Needs to Be Stopped<\/strong><\/h2>\n\n\n\n
If it\u2019s decided you should stop aspirin before surgery, it\u2019s usually stopped about 5\u20137 days in advance. That\u2019s because aspirin\u2019s effect on platelets lasts for their entire lifespan (around 7\u201310 days). After stopping, your body gradually replaces affected platelets with new ones that can clot normally.<\/p>\n\n\n\n
You\u2019ll typically restart aspirin as soon as your surgeon feels it\u2019s safe \u2014 often the day after surgery, or within a few days if there are no complications. The exact timing depends on your surgery, your bleeding risk, and your cardiovascular history.<\/p>\n\n\n\n
Why You Should Never Decide on Your Own<\/strong><\/h2>\n\n\n\n
It\u2019s tempting to think, \u201cI\u2019ll just stop aspirin a few days before surgery to be on the safe side.\u201d But stopping aspirin suddenly \u2014 especially if you\u2019re taking it for heart or stroke prevention \u2014 can significantly raise your risk of a serious cardiovascular event. In some people, this rebound effect can happen within days.<\/p>\n\n\n\n
That\u2019s why you should never<\/strong> change your medication without talking to your surgeon and your GP or cardiologist. Even for something that feels \u201clow risk\u201d like cataract surgery, the bigger picture of your health must be considered.<\/p>\n\n\n\n
Preparing for Cataract Surgery If You\u2019re on Aspirin<\/strong><\/h2>\n\n\n\n
If you\u2019re taking aspirin and have cataract surgery scheduled, here\u2019s how to prepare:<\/p>\n\n\n\n
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Tell your surgeon about your aspirin use<\/strong> at your pre-operative assessment.<\/li>\n\n\n\n
Be clear about why you take it<\/strong> (heart attack prevention, stroke history, stent, etc.).<\/li>\n\n\n\n
Bring a list of all medications<\/strong> you\u2019re taking, including herbal supplements and over-the-counter drugs.<\/li>\n\n\n\n
Ask if you should continue aspirin<\/strong> or if there\u2019s a plan to pause it.<\/li>\n\n\n\n
Follow their instructions exactly<\/strong> \u2014 don\u2019t adjust the dose or stop early unless told to.<\/li>\n<\/ul>\n\n\n\n
FAQs: Aspirin and Cataract Surgery<\/strong><\/h2>\n\n\n\n\n
Is it safe to keep taking aspirin before cataract surgery?<\/strong> For the majority of patients, continuing low-dose aspirin before cataract surgery is considered safe. Modern cataract techniques use tiny incisions and cause minimal bleeding, so the risk of serious complications is very low. The main reason to keep taking aspirin is to protect you from heart attacks or strokes, particularly if you\u2019ve already had one or are at high cardiovascular risk. While you might notice a small red patch on the white of the eye afterwards (a subconjunctival haemorrhage), this is harmless and fades within a couple of weeks. Your surgeon will look at your personal health history before confirming the best option.<\/li>\n\n\n\n
Can aspirin cause blindness during cataract surgery?<\/strong> The fear of going blind from bleeding during cataract surgery while on aspirin is understandable but not supported by evidence for routine cases. The most likely bleeding issue from aspirin is superficial \u2014 under the clear membrane on the white of the eye \u2014 and it does not affect your sight. Very rarely, bleeding inside the eye can occur, but this is uncommon and often linked to other high-risk factors rather than aspirin alone. Surgeons are trained to manage bleeding should it happen, making the overall risk to your vision extremely low.<\/li>\n\n\n\n
Should I stop aspirin if I\u2019m only taking it occasionally?<\/strong> If you take aspirin now and then for pain relief rather than for heart or stroke prevention, your surgeon may prefer you to avoid it for several days before surgery. This is because its blood-thinning effect lasts for the lifespan of the platelets it affects \u2014 roughly a week \u2014 and pausing it can help reduce even minor bleeding. However, you should still let your surgeon know exactly when you last took aspirin, as this can influence their surgical planning and the advice they give you.<\/li>\n\n\n\n
How long before cataract surgery should aspirin be stopped, if needed?<\/strong> In the uncommon situations where aspirin needs to be paused, it is usually stopped around 5\u20137 days before surgery. This allows your body time to replace affected platelets with new ones that can clot normally. The timing is important \u2014 stopping it too far in advance can increase your risk of cardiovascular events, and stopping it too late may not reduce bleeding risk at all. Your surgeon will give you an exact date for your last dose if this approach is necessary.<\/li>\n\n\n\n
Will I need to restart aspirin after surgery?<\/strong> Yes, if you normally take aspirin for ongoing heart or stroke protection, restarting it is important. Many surgeons advise resuming it within 24 hours after surgery if there are no complications, while others may suggest waiting a couple of days to be sure there\u2019s no risk of delayed bleeding. Your post-operative check-up is the perfect time to confirm the safest restart point, and you should follow your surgeon\u2019s instructions carefully to avoid both clotting and bleeding problems.<\/li>\n\n\n\n
What if I\u2019m also on warfarin or another blood thinner?<\/strong> Being on aspirin alongside another anticoagulant such as warfarin, apixaban, or clopidogrel requires extra care. This combination increases the risk of bleeding, even in low-risk surgeries like cataract removal. Your surgeon will usually coordinate with your GP or specialist to decide if adjustments are needed to one or both medications. Sometimes, only one of the drugs is paused, or the timing of your procedure is adjusted to keep you safe. It\u2019s essential to disclose all medications well ahead of your operation.<\/li>\n\n\n\n
Can aspirin increase swelling after cataract surgery?<\/strong> Aspirin itself does not directly cause swelling inside the eye, but it can lead to a little more bleeding in some cases, and that blood can trigger temporary inflammation. This type of swelling usually responds well to the anti-inflammatory eye drops given after surgery and doesn\u2019t have a lasting impact on your vision. Most patients on aspirin recover at the same pace as those not taking it, provided they use their prescribed drops consistently and attend all follow-up appointments.<\/li>\n\n\n\n
Does aspirin affect cataract surgery recovery time?<\/strong> For most people, aspirin use doesn\u2019t make recovery from cataract surgery longer. You can expect vision to start improving within a few days, with most healing complete within four to six weeks. Minor surface bleeding from aspirin does not interfere with visual recovery and generally clears up on its own. The key to smooth healing is following all aftercare advice, avoiding eye rubbing, and reporting any unusual changes \u2014 like a sudden drop in vision \u2014 promptly to your surgeon.<\/li>\n\n\n\n
Can I switch to a different blood thinner before surgery?<\/strong> Sometimes patients ask if they can switch from aspirin to another type of blood thinner before cataract surgery to reduce bleeding risks. This is rarely done just for eye surgery, because any change in your antiplatelet or anticoagulant therapy carries its own dangers. If there is a strong reason to make a change, it must be agreed upon by your cardiologist or GP, not just your eye surgeon. Such changes are carefully timed and monitored to avoid increasing your risk of a heart attack or stroke.<\/li>\n\n\n\n
Will the anaesthetic be different if I\u2019m on aspirin?<\/strong> In most cases, no \u2014 cataract surgery under local anaesthetic is safe whether or not you\u2019re on aspirin. The surgeon may take extra precautions during the injection (if an injection is used rather than anaesthetic eye drops) to minimise bruising or bleeding around the eye. Some surgeons opt for topical anaesthetic drops only in aspirin users to further reduce injection-related risks, but this decision is made individually. Either way, your comfort and safety remain the top priority.<\/li>\n<\/ol>\n\n\n\n
Final Thoughts<\/strong><\/h2>\n\n\n\n
For most people, continuing aspirin before cataract surgery is the safest option, especially if you\u2019re taking it to protect your heart or reduce stroke risk. While there may be a slightly higher chance of minor surface bleeding, this very rarely affects vision or the success of your procedure. The bigger risk for many patients comes from stopping aspirin suddenly without medical advice.<\/p>\n\n\n\n
We take the time to look at your whole health picture before making any recommendations. We\u2019ll work closely with your GP or cardiologist if needed, so you get a plan that\u2019s right for both your eyes and your overall wellbeing. Our goal is to give you a smooth, safe surgical experience \u2014 and the best possible vision afterwards.<\/p>\n\n\n\n
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