Many people preparing for cataract surgery worry that the medications they take for chronic conditions—such as hypertension or diabetes—might affect the procedure. This post clearly summarizes principles for coordinating medications based on systemic disease control and outlines when internal medicine co-management is recommended, to support safer decision-making.
“I take my blood pressure medication every day—what if the bleeding won’t stop during surgery?”
If you’ve been taking long-term medication for a chronic condition, it’s completely understandable to feel anxious just hearing the word “surgery.”
With advances in medical technology, cataract surgery is often performed as a minimally invasive procedure with a small incision and relatively fast recovery. In real clinical practice, however, ophthalmologists carefully assess not only the condition of the eye but also how well underlying systemic diseases are controlled. Even though the incision is tiny, stable circulation and metabolism are essential to prevent unexpected events and to achieve a good outcome.
💊Essential checkpoint before reading: Blood pressure medications vs. antithrombotic agents
- Blood pressure medications (antihypertensives): Lower blood pressure. They do not directly increase bleeding, so it is generally safest to continue them on the day of surgery according to your medical team’s instructions.
- Antithrombotic agents (antiplatelets such as aspirin, anticoagulants, etc.): Reduce clot formation by inhibiting platelet function or coagulation. They can affect minor bleeding during surgery, so any adjustment should be based on an individualized risk assessment.
1. Three criteria that matter more than simply “having” a systemic condition before cataract surgery
Cataract surgery is usually performed under topical (eye-drop) anesthesia or local anesthesia and generally involves minimal physical stress. For that reason, people often focus only on the surgical technique or the type of intraocular lens (IOL). But what truly matters is the patient’s overall health status. More important than whether a condition exists is how stably it is currently controlled—this is what determines safety.
Managing underlying systemic disease is like laying a solid foundation before building a structure. If the body’s circulation is unstable, it becomes harder to expect a smooth recovery and favorable prognosis. For safe surgery, clinicians review three criteria together:
- Control status: Confirm whether blood pressure and blood glucose are stable before and after surgery.
- Current medications: Identify the exact medications being taken—especially whether any antithrombotic agents are included.
- Coexisting eye disease: Check for retinal conditions such as diabetic retinopathy and assess their current status.
When these factors are balanced, postoperative recovery can be predicted more reliably.
Having a chronic condition does not automatically mean you cannot have surgery. If blood pressure and blood glucose remain within a predictable range, surgery can often proceed safely. The first step is an objective assessment of your current condition through close collaboration between ophthalmology and internal medicine.
2. Why stopping aspirin or anticoagulants on your own can be more dangerous
People taking aspirin or anticoagulants (warfarin, NOACs/DOACs, etc.) to prevent cardiovascular disease often worry about bleeding. However, compared with major systemic operations, cataract surgery is generally considered a low-bleeding-risk procedure. If you stop these medications on your own to avoid minor bleeding, you may instead increase the risk of clot formation—potentially leading to serious events such as stroke or myocardial infarction.
Think of it like car maintenance. Managing antithrombotic therapy is like routine inspection. You wouldn’t abandon the engine (clot prevention) just because you’re worried about a small scratch you can see right now (a subconjunctival hemorrhage). A subconjunctival hemorrhage may look red temporarily, but it is typically harmless and resolves as it is naturally absorbed. Studies have reported that proceeding with cataract surgery without stopping antithrombotic agents does not meaningfully increase the rate of serious intraocular hemorrhage.
Therefore, any medication changes must be discussed with both the prescribing physician and the ophthalmic surgical team. Whether timing or dosing adjustments are needed should be decided after carefully evaluating the individual’s thrombotic risk, kidney function, and the specific medication profile.
📌Pre-surgery self-checklist for medications (antithrombotic agents)
- Have you checked your prescription for ingredients such as aspirin, clopidogrel, warfarin, or a NOAC/DOAC (e.g., rivaroxaban)?
- Is the purpose of taking the medication related to coronary stent placement, atrial fibrillation, or stroke prevention?
- Have you written down the name of the clinic/hospital that prescribed it and the date of your most recent visit?
- Have you ever been told you have reduced kidney function (chronic kidney disease)?
3. Cataract surgery in patients with diabetes: Why the retina matters more than the day-of blood glucose number
Many patients with diabetes tend to focus only on the blood glucose value measured on the day of surgery. Blood glucose control is, of course, important to reduce inflammation and support healing. However, the key factor that ultimately determines the quality of vision after surgery is the health of the retina, located deep inside the eye.
The retina is like the precise film in a camera that receives light and forms an image. No matter how clearly the cloudy lens (the natural crystalline lens) is replaced, if the “film” that processes the image is already damaged, significant visual improvement may be limited. In particular, if macular edema or active diabetic retinopathy is present, surgical stress can increase inflammation and worsen swelling.
That is why patients with diabetes often undergo optical coherence tomography (OCT) and a dilated fundus examination to closely evaluate the retina and macula. These tests help predict postoperative visual recovery and guide preoperative planning. If retinal pathology is identified, retinal treatment may be prioritized first depending on cataract severity. Surgery is then scheduled once the retinal condition is stable.
4. Warning signs that call for internal medicine co-management and safer medication coordination
Needing internal medicine co-management before cataract surgery does not mean surgery is impossible. It is a safety step to tailor the plan to your overall condition—essentially adding an extra layer of protection by reviewing systemic status and medications to control risk.
Co-management between the two departments is commonly arranged in the following situations:
First, if you have recently undergone coronary stent placement (to restore blood flow) or have a history of a prosthetic heart valve and are taking antithrombotic agents. Stopping medication on your own may raise the risk of thrombosis or re-occlusion, so careful coordination is required.
Second, if you have chronic kidney disease with reduced kidney function. Because drug clearance may be delayed, medication adjustments may be needed based on renal function.
Third, if your blood pressure fluctuates widely and findings such as tachycardia or arrhythmia are observed.
Because this process is about designing a personalized safety net for your situation, it’s meant to be reassuring. Using co-management appropriately helps ensure a more comfortable and safer surgical environment.
📌 What patients should prepare for internal medicine co-management
- Bring prescriptions from your current clinic/hospital or an English medication list of what you are taking.
- Bring results from blood tests and kidney function tests performed within the last 3–6 months.
- Submit to the ophthalmology clinic a written opinion from your prescribing physician regarding perioperative medication coordination for cataract surgery.
5. Stabilization strategies to prevent a blood pressure spike on the day of surgery
For patients with chronic conditions, one of the most common day-of-surgery variables is a sudden rise in blood pressure due to anxiety. It’s common for blood pressure that stays within a normal range at home to rise sharply in a hospital waiting area. Rapid blood pressure changes can affect ocular blood flow during surgery, so advance planning matters.
The most basic and important measure is not skipping your usual antihypertensive medication and taking it on time the morning of surgery. Even when fasting is instructed, standard clinical guidance typically advises taking blood pressure medication with a small sip of water. Keeping values steady helps prevent excessive fluctuations.
The day before surgery, it helps to eat a light dinner and get adequate sleep to reduce fatigue. On the day of surgery, avoid having your blood pressure measured while you are out of breath from rushing. Arriving a bit early and maintaining calm, steady breathing can make a meaningful difference.
6. Frequently Asked Questions (FAQ)
Q. I’m taking antithrombotic medication—how many days should I stop it before cataract surgery?
Cataract surgery is generally considered a low bleeding-risk procedure, so many patients proceed with minimal adjustment or by continuing antithrombotic agents (including aspirin) rather than stopping them on their own. However, individualized adjustment may be needed depending on the cardiovascular indication and kidney function. Do not stop medication on your own—follow the instructions of both the prescribing physician and the ophthalmic surgical team.
Q. If I have diabetes, what additional tests will I need before surgery?
In addition to glucose-related tests such as HbA1c, you may also undergo OCT and a dilated fundus examination to evaluate the retina and macula. Assessing the activity of diabetic retinopathy or macular edema is important for timing surgery and predicting visual prognosis.
Q. I have to fast on the morning of surgery—how should I take my blood pressure medication?
In general, it is standard to take your usual blood pressure medication on the morning of surgery with a very small sip of water rather than skipping it. If you skip it on your own, blood pressure may rise significantly due to stress. If you bring a list of your medications (including active ingredients), the medical team can provide more precise guidance.
Q. If I have an underlying condition, who definitely needs internal medicine co-management or additional testing?
Co-management may be needed if you are on long-term antithrombotic therapy (antiplatelets such as aspirin, or anticoagulants), or if you have a recent history of stent placement or atrial fibrillation. It may also be recommended if you have chronic kidney disease with reduced kidney function, or if blood pressure control is very unstable and a day-of-surgery spike is a concern. In these cases, obtaining an internal medicine specialist’s input is part of improving safety.
Having an underlying condition for a long time does not mean you need to assume cataract surgery will be unsafe. What determines whether surgery can proceed is not simply the presence of a condition, but how well it is controlled, the medication plan, and whether there is coexisting eye disease. If you avoid stopping medications on your own and coordinate the plan with both your ophthalmology and internal medicine teams, you can approach surgery with much greater peace of mind. The prescriptions and records you prepare can serve as a reliable guide for making safe decisions in the clinic.
Sources
- Korean Ophthalmological Society, Guidelines on systemic disease management before cataract surgery and guidance for patients undergoing local anesthesia, 2023.
- Korean Heart Rhythm Society, Clinical guidelines for NOAC/anticoagulation therapy (recommendations for perioperative medication coordination), 2024.
- Seminars in Ophthalmology, "Do we need to hold aspirin before cataract surgery? Systematic review & meta-analysis", 2024.
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