Getting Ready for Glaucoma Surgery: Blood Thinners, Current Drops and the Morning Routine

The envelope from the eye clinic is thinner than you expected. Two pages, a date, a phone number, and a line that says something like “continue your usual medicines unless advised.” You read it twice at the kitchen table, then look at the row of bottles by the sink: the pressure drops you use twice a day, the blood thinner your cardiologist added after a stent, the vitamin D you barely think about. Which of these matters on Tuesday morning? Nobody has said.

That small gap between the letter and the bottles is where most of the anxiety around preparing for glaucoma surgery lives. The operation itself is usually short and done under local anesthesia. The preparation is where patients feel unsure, and where a few honest conversations can make the day feel ordinary rather than frightening.

This explainer walks through what surgeons typically ask about, why blood thinners get so much attention, what happens to your current drops, and what the morning actually looks like, so that your questions arrive at the pre-assessment visit already formed.

Why preparing for glaucoma surgery starts weeks before the operating room

Glaucoma is a group of conditions in which the optic nerve, the cable carrying images from eye to brain, is slowly damaged, most often because fluid pressure inside the eye is higher than that nerve can tolerate. Surgery for glaucoma does not repair the nerve. It lowers the pressure so that further damage is slowed, which is why the National Eye Institute describes it as a way to prevent additional vision loss rather than restore what has gone.

That single fact shapes the whole preparation. Because the goal is protection, surgeons want the eye and the rest of you to arrive in as stable a state as possible. A pre-assessment visit, usually a few weeks ahead, typically covers your full medicine list, allergies, other health conditions, previous eye operations, and whether you can lie flat and still for the length of the procedure.

Three areas take up most of the conversation:

• Blood thinners, because bleeding inside or around the eye can affect how a new drainage pathway heals.
• Your current pressure-lowering drops, because some are continued right up to the day and others are paused.
• The practical morning itself: fasting, washing, transport, and who is coming with you.

Preparation is not a test you can fail. It is a shared checklist. Patients who bring the actual bottles, or a photo of them, tend to have shorter and clearer pre-assessment conversations than those relying on memory, especially when a drop and a tablet share a similar-sounding name. Every instruction in this article is a description of what teams commonly ask; the version that applies to you is the one written on your own letter.

What actually happens during glaucoma surgery

“Glaucoma surgery” is an umbrella. The Mayo Clinic and the NHS group the main options into laser procedures, filtering operations and drainage implants, with a newer family of smaller-incision techniques sitting alongside them.

Laser trabeculoplasty targets the trabecular meshwork, the spongy tissue that drains fluid from the front of the eye, using gentle energy to improve outflow. It is done in a clinic chair with numbing drops and typically takes minutes.

A trabeculectomy is the classic filtering operation. The surgeon creates a tiny flap in the sclera, the white wall of the eye, so fluid can drain into a small reservoir under the upper eyelid called a bleb. Because the operation depends on that flap healing at just the right pace, surgeons often use medicines during and after to slow scarring.

Drainage implants, sometimes called tube shunts, place a very small tube inside the eye connected to a plate resting on the eye’s surface under the conjunctiva, the clear skin covering the white of the eye. Fluid travels along the tube to be absorbed around the plate.

Minimally invasive glaucoma surgery, often shortened to MIGS, uses microscopic devices or channels to improve the eye’s natural drainage through very small incisions, frequently combined with cataract surgery.

Most of these are performed under local anesthesia, meaning the eye and surrounding tissue are numbed with drops or an injection while you stay awake, sometimes with a light sedative. General anesthesia, where you are fully asleep, is reserved for particular situations such as young children or people who cannot lie still. The type you are offered affects your fasting instructions, so the anesthesia plan is one of the first things to confirm.

At what stage of glaucoma is surgery needed, and who is usually asked to wait?

There is no single pressure number or field-test result that triggers surgery. The NHS describes surgery as an option when drops or laser have not controlled pressure well enough, when a person cannot tolerate drops, or when the damage is progressing despite treatment. The Mayo Clinic frames it the same way: surgery sits further along a ladder that usually begins with drops and laser.

People commonly offered an operation include those with:

• Pressure that stays above the individual target their specialist has set, despite maximal tolerated drops.
• Documented worsening on visual field tests or optic nerve imaging over successive visits.
• Difficulty using drops reliably, whether because of arthritis, memory, side effects or cost of time and attention.
• Certain forms of glaucoma, such as angle-closure, where a laser opening in the iris is often an early rather than late step.

People often asked to wait, or to prepare further first, include those with an active eye infection or inflamed lid margins, uncontrolled blood pressure or blood sugar, a recent heart event or stroke where the cardiology team wants antithrombotic treatment left untouched for a defined period, or an acute chest infection that would make lying flat uncomfortable. Waiting in these situations is not a refusal; it is the surgical team choosing a safer week.

The honest answer to “what stage” is therefore “the stage at which the risk of continuing without surgery has become greater than the risk of operating,” and that calculation is personal. Two people with identical pressure readings can reasonably receive different advice depending on age, the other eye, and how fast their fields are changing. The decision rests with the treating specialist, ideally explained to you in terms of your own test results.

Blood thinners before glaucoma surgery: what your team is weighing

“Blood thinner” covers two different families. Antiplatelet drugs such as aspirin or clopidogrel make platelets less sticky. Anticoagulants such as warfarin or the newer direct oral anticoagulants slow the clotting cascade itself. Both reduce the risk of clots in the heart, brain or legs, and both raise the chance of bleeding when tissue is cut.

Why does this matter for an eye? A filtering operation depends on delicate tissue healing in a controlled way; blood in the wrong place can encourage scarring that closes the new drainage route. A drainage implant involves work on the conjunctiva and sclera where small vessels sit. Even laser trabeculoplasty, which involves no cutting, can be done more comfortably when the surgeon can see clearly.

Against that sits the reason you were prescribed the medicine in the first place. For someone with a recent coronary stent, atrial fibrillation with previous stroke, or a mechanical heart valve, interrupting treatment carries a real risk of a clot that is far more dangerous than a bruise on the eye. Surgeons generally recognize that many glaucoma procedures can proceed with antithrombotic therapy continued, and that stopping should only happen after the prescribing cardiologist or physician has agreed.

Practically, this means three things. First, list every blood thinner, including over-the-counter aspirin and fish oil, on your pre-assessment form. Second, do not pause or halve anything on your own initiative; a change made “to be helpful” can leave your heart team unaware. Third, ask who is coordinating the decision, so that the eye surgeon’s letter and the cardiologist’s letter say the same thing. The mechanism is simple: the timing decision belongs jointly to the people who prescribed and the people who will operate.

Should I keep using my current glaucoma drops before surgery?

In most cases, yes, right up to the morning, unless your letter states otherwise. The pressure-lowering drops you already use are doing the very job the surgery is designed to secure, and the NHS notes that treatment continues until the operation takes over. Stopping them early would raise pressure in the days when the optic nerve is already under strain.

Some classes are handled differently, and it helps to understand why rather than memorize a list:

• Prostaglandin analogues, which increase fluid outflow, are sometimes paused for a short period before filtering surgery because they can encourage inflammation that interferes with the healing flap. Whether this applies is a surgeon-by-surgeon decision.
• Miotics, drops that constrict the pupil, may be stopped before certain laser procedures because the surgeon needs a particular pupil size to see the angle, or continued because that same constriction opens the drainage angle for treatment.
• Beta-blocker drops, which reduce fluid production, are usually continued, but you should mention them to the anesthetist since a small amount reaches the bloodstream.
• Carbonic anhydrase inhibitor tablets, another way of reducing fluid production, are sometimes added in the days before surgery to bring pressure down for the day itself.

The operated eye and the other eye may receive different instructions. Patients often assume that “stop your drops” means both eyes; it rarely does. Write the instruction for each eye separately on your fridge or phone.

If a drop runs out in the week before surgery, contact the clinic rather than skipping. And bring the drops with you on the day: if the team decides you should have a dose before going in, they will want the exact bottle, not a description of it.

Other medicines, supplements and health conditions worth mentioning

The pre-assessment nurse is not only interested in blood thinners and drops. Several other everyday medicines change how the surgery is planned.

Alpha-blockers used for prostate symptoms or blood pressure relax the muscles of the iris as well as the bladder neck. During cataract surgery this can make the pupil behave unpredictably, and since MIGS is often combined with cataract removal, the surgeon will want to know. Nobody is asked to stop these; they simply adjust technique.

Diabetes medicines matter because of fasting. If you take insulin or tablets that lower blood sugar, going without breakfast can drop your glucose. The team will usually give a specific plan, which may include an earlier slot in the day.

Steroid inhalers, tablets or creams are relevant because steroids can raise eye pressure in some people, and because postoperative steroid drops are almost universal. Knowing your history helps the surgeon anticipate a pressure spike after surgery.

Supplements deserve a line of their own. Fish oil, high-dose vitamin E, ginkgo, garlic and ginger have all been reported to increase bleeding tendency; the NIH Office of Dietary Supplements advises telling surgical teams about every supplement for this reason. Most teams ask you to pause these for a period before surgery, though the instruction should come from them.

Finally, mention anything that makes lying flat difficult: heart failure, severe back pain, a persistent cough, tremor, claustrophobia, or hearing loss that would make it hard to follow instructions under a drape. None of these rule out surgery. Each of them changes the position, the sedation plan, or the way the team communicates with you, and a surgeon who knows in advance can plan a calmer morning for you.

What not to do before eye surgery

Most of the “do not” list exists to protect two things: the sterile field around the eye, and the accuracy of what the surgeon can see and measure.

Do not wear eye makeup, false lashes or lash extensions on the day, and ideally for a couple of days before. Mascara particles lodge in the lash line and can be carried into the eye during surgery. Lash glue makes cleaning the lid margin difficult.

Do not wear contact lenses in the days leading up to surgery unless the clinic has said otherwise. Lenses subtly change the shape and hydration of the cornea, the clear window at the front of the eye, and can alter measurements taken at pre-assessment. If you have a rigid lens, the settling period is longer; ask how long your surgeon prefers.

Do not stop, start or adjust any prescription medicine on your own. This includes the blood thinners already discussed and also blood pressure tablets; arriving with a very high reading can lead to postponement.

Do not drink alcohol the night before. Alcohol dehydrates, interacts with sedatives, and can raise blood pressure the next morning. Do not smoke on the day; nicotine constricts blood vessels and can interfere with anesthesia.

Do not plan to drive yourself. Even a laser procedure under drops alone leaves the eye light-sensitive and dilated for hours, and a filtering operation means a patch or shield.

Do not ignore a new symptom. A cold, a cough, a red or sticky eye, or a cold sore near the eye are all worth a phone call in the days before, because operating through an active infection is something surgeons avoid.

And do not skip the pre-assessment questions because they feel repetitive. The repetition is deliberate: the same question asked by two people catches the omission one person would miss.

The morning routine: fasting, washing, dressing and what to bring

The night before, wash your face and hair with ordinary soap and shampoo so you do not have to do it on the morning with an eye that is about to be operated on. Remove nail varnish if your letter asks; some monitors read oxygen through the nail.

Fasting depends on anesthesia. If you are having local anesthesia with no sedation, many services allow a light breakfast, and some actively encourage it so you are not lightheaded. If sedation or general anesthesia is planned, you will be given a time after which no food is allowed, and a later time for clear fluids. Follow these exactly; arriving having eaten can mean the case is cancelled for safety. Clear water up to the stated cut-off usually helps rather than harms.

Take your usual morning tablets with a small sip of water unless told otherwise. For most patients this includes blood pressure medicines, thyroid tablets and, if the joint decision was to continue them, blood thinners. Diabetes medicines follow the specific plan you were given.

Use your glaucoma drops in both eyes as instructed. If you are unsure whether the operated eye should have its morning dose, bring the bottle and ask on arrival rather than guessing.

Wear comfortable clothes with a top that opens at the front, so you do not have to pull anything over your head afterward. Leave jewelry at home.

What to bring: your letter, the full medicine list or the bottles themselves, your current glasses, a pair of sunglasses for the journey home, any hearing aids, and the phone number of the person collecting you. Bring a snack for afterward if you have fasted. Leave time; a rushed arrival with high blood pressure is a common cause of delay.

How preparation differs by procedure type: a comparison

Preparation for a laser trabeculoplasty in a clinic chair is not the same as preparation for a filtering operation in an operating theater. The table below summarizes typical differences described by the NHS, the Mayo Clinic and the National Eye Institute. It is a guide to the shape of each pathway, not a substitute for your own instructions.

Procedure	Where and how	Blood thinners commonly	Usual fasting	Aftercare pattern
Laser trabeculoplasty	Clinic, numbing drops, minutes	Continued	None in most services	Pressure check within hours; drops continued
Laser iridotomy (angle-closure)	Clinic, numbing drops, minutes	Continued	None in most services	Short course of anti-inflammatory drops
Trabeculectomy	Operating theater, local anesthetic with or without sedation	Individual decision with prescriber	Depends on sedation plan	Frequent visits in early weeks; possible suture adjustment
Drainage implant (tube)	Operating theater, local or general	Individual decision with prescriber	Depends on anesthesia	Shield at night; pressure may fluctuate early
MIGS with cataract surgery	Operating theater, usually local	Often continued	Depends on sedation plan	Similar to cataract recovery; fewer visits

Two patterns stand out. Laser procedures rarely require any change to your medicines or your breakfast. Incisional procedures are where the anesthesia plan, and therefore fasting, becomes important, and where the blood thinner conversation actually needs to happen. If your letter does not say which type you are having, that is the first question to ask, because everything else flows from it.

What the first days after glaucoma surgery usually look like

Recovery has a shape that surprises people: the eye often feels worse on day two than on day one, then steadily improves. The Mayo Clinic and the NHS both describe a period of blurred vision, grittiness, watering and light sensitivity after incisional glaucoma surgery, and note that pressure may need adjusting in the early weeks.

Day one you will usually go home with a clear plastic shield or a pad, a bag of drops that typically includes an antibiotic and a steroid, and a follow-up appointment within a day or two. For trabeculectomy and tube surgery, that first visit is where the surgeon checks the pressure is neither too high nor too low, examines the bleb or tube position, and looks for bleeding or leakage.

Days two to seven bring most of the discomfort. A scratchy, foreign-body feeling is common where sutures sit on the surface. Vision in the operated eye is often blurrier than before surgery; this is expected and does not mean the operation has failed. Some surgeons adjust or release sutures during this period to fine-tune how fast fluid drains.

Weeks two to six are about healing settling. Steroid drops are usually tapered gradually rather than stopped, because sudden withdrawal can allow inflammation to return. Your pre-existing glaucoma drops in the operated eye may be stopped, continued or reintroduced depending on the pressure readings, and the surgeon will tell you at each visit.

The other eye keeps its usual routine throughout, which is a common source of confusion. Keep the two schedules written side by side. And remember that the timeline above describes incisional surgery; after laser procedures most people are back to normal activity the same or next day, with only a short course of drops.

How long to rest after glaucoma surgery, and what not to do

The question “how many days should I rest” usually means two different things: when can I go back to work, and what activities might harm the eye. The answers differ.

Light activity, walking, reading and screen use are generally allowed within a day or two of incisional surgery; the NHS notes that resting the eye does not mean lying in a dark room. Blurred vision, not fragility, is what limits reading early on. Desk-based work is often possible within one to two weeks depending on how the eye feels and how frequent the follow-up visits are. Physically demanding work or jobs in dusty environments typically wait longer, and your surgeon will give a specific range based on what they see at each visit.

The things to avoid protect the fresh wound and the delicate new drainage pathway:

• Rubbing or pressing on the eye, which can disturb sutures or a bleb. Wear the shield at night as instructed so you do not rub in your sleep.
• Heavy lifting, straining and bending with your head below your waist, which raise pressure in the head and eye briefly.
• Swimming, hot tubs and getting tap water directly in the eye, because of infection risk while the surface is healing.
• Eye makeup on the operated side until the surgeon clears it.
• Driving until vision meets the legal standard and you feel safe; a dilated, blurred eye affects depth perception.
• Contact lenses in the operated eye until specifically permitted, which may be many weeks after filtering surgery.

Showering is fine with your eyes closed and the shield or a clean cloth over the eye. Cooking, television and gentle housework are fine. The rule of thumb surgeons often give is simple: if an activity makes you strain, hold your breath, or risks something touching the eye, wait and ask.

What people often get wrong about preparing for glaucoma surgery

“I should stop my blood thinner to be safe.” This is the most consequential misunderstanding. The risk that the blood thinner is preventing, a clot in a coronary stent or a stroke from atrial fibrillation, is generally far larger than the risk of bleeding during eye surgery. Many glaucoma procedures can proceed with these medicines continued. Any pause is a coordinated decision between your eye surgeon and the prescriber, never a solo choice.

“Surgery will give me back the vision I have lost.” The National Eye Institute is explicit that glaucoma damage is permanent and that treatment aims to prevent further loss. Surgery lowers pressure; it does not regrow nerve fibers. People who go in expecting sharper sight afterward can feel let down by an operation that has actually done its job.

“After surgery I will never need drops again.” Some people do stop drops in the operated eye, some reduce them, and some need them again months or years later as the drainage pathway scars. The other eye keeps its own treatment. Surgery is another tool for controlling pressure, not an exit from care.

“Stop my drops means both eyes.” Almost always it means the operated eye only, and often only for specific classes. Ask for the instruction eye by eye.

“Blurry vision on day three means something has gone wrong.” Blur, watering and grittiness are expected in the first week or two after incisional surgery. Sudden severe pain, a curtain across vision, or a rapidly reddening eye are the signs that warrant a call, not blur alone.

“If I feel fine I can skip the day-one visit.” Pressure that is too low or too high in the first days can be silent. That appointment exists precisely because you cannot feel the number.

Questions to ask your care team before the day

A pre-assessment visit goes better with a short list in your pocket. These are the questions that most often turn a vague letter into a plan you understand.

• Which procedure exactly am I having, and is it in a clinic chair or an operating theater?
• What kind of anesthesia is planned, and does that mean I need to fast? From what time?
• Which of my current glaucoma drops should I use on the morning of surgery, and in which eye?
• Are any of my drops being paused beforehand, and for how long?
• Have you spoken to the doctor who prescribes my blood thinner, and what has been agreed in writing?
• Which supplements should I pause, and when can I restart them?
• How will my diabetes medicines be handled if I am fasting?
• What will I be given to take home, and who will show me how to use the drops if my hands or eyesight make it difficult?
• When is my first follow-up, and who do I call outside clinic hours if something worries me?
• What symptoms in the first week should prompt a same-day call?
• Will my other eye’s treatment change at all?
• Roughly how long before I can drive, return to work and resume my usual exercise, given my particular situation?

Bring someone with you if you can. Instructions delivered under the mild stress of a hospital corridor are easily half-remembered, and a second pair of ears, or a phone recording made with the team’s permission, saves phone calls later. If English is not your first language, ask for an interpreter at the pre-assessment as well as on the day; the medicine conversation is where precision matters most.

Write the answers down before you leave. A single sheet with “operated eye” and “other eye” columns, the fasting time, the pick-up arrangement and the emergency number is the most useful document you will own that week.

When to call your doctor

Most people recovering from glaucoma surgery have a predictable, mildly uncomfortable first week and no emergencies. A small number develop problems that are treatable if caught early and harmful if ignored. The clinic should give you a number that works out of hours; keep it where you can find it without your glasses.

Call the same day, or attend an emergency eye service, if you notice any of the following in the operated eye:

• Increasing pain that is not eased by the pain relief you were advised to use, particularly with nausea or vomiting, which can signal a sharp rise in pressure.
• A sudden and marked drop in vision compared with the day before, or a dark curtain or shadow moving across your sight.
• Rapidly worsening redness, especially with a sticky yellow or green discharge, or the eyelids becoming swollen and hot.
• A gush or steady trickle of fluid from the eye, which can indicate a leak from the surgical wound.
• Seeing a shower of new floaters or flashes of light.
• Any injury to the eye, however minor it seems.

Call during clinic hours, without waiting for the next appointment, if grittiness or blur is getting worse rather than slowly better after the first week, if you cannot manage the drop schedule, or if you have accidentally used a drop in the wrong eye or missed several doses.

Symptoms elsewhere in the body also count. If a blood thinner was paused around surgery and you develop chest pain, sudden weakness on one side, difficulty speaking, or a painful swollen calf, treat it as an emergency and call the emergency number, then tell both your cardiologist and your eye team what has happened.

You will not be criticized for calling about something that turns out to be nothing. Eye teams would far rather check a worried patient than see a preventable problem a week late.

Frequently asked questions

How many days should I rest after glaucoma surgery?

Most people are up and walking the same day, with light activity such as reading and screens allowed within a day or two of incisional surgery. Desk work often resumes within one to two weeks, while heavy lifting, straining, swimming and dusty environments wait longer. After laser procedures, normal activity typically resumes the same or next day. Your surgeon sets the exact range based on how your eye heals at each follow-up visit.

When is glaucoma surgery needed rather than drops or laser?

Surgery is generally considered when pressure stays above your individual target despite maximum tolerated drops, when tests show the damage progressing, or when drops cannot be used reliably or tolerated. Some forms, such as angle-closure glaucoma, involve a laser step early on. There is no single pressure number that triggers an operation; the decision weighs the risk of continuing without surgery against the risk of operating, and sits with your specialist.

What not to do before eye surgery?

Do not wear eye makeup or lash extensions, do not wear contact lenses in the days beforehand unless told otherwise, do not drink alcohol the night before, do not smoke on the day, and do not drive yourself home. Most importantly, do not stop, start or adjust any prescription medicine, including blood thinners, without written agreement from your surgical team and the prescribing doctor. Call the clinic if you develop a cold, cough or red eye.

Should I stop my blood thinner before glaucoma surgery?

Not on your own. Many glaucoma procedures, particularly laser and minimally invasive surgery, can be performed with antiplatelet or anticoagulant medicines continued, because the clot risk they prevent usually outweighs the bleeding risk. If your surgeon feels a pause is needed for a filtering operation, that decision is made jointly with the cardiologist or physician who prescribed it. List every blood thinner, including over-the-counter aspirin, at your pre-assessment.

Do I use my glaucoma drops on the morning of surgery?

Usually yes, in both eyes, unless your letter says otherwise. Pressure-lowering drops protect the optic nerve right up until the operation takes over. Certain classes, such as prostaglandin analogues or pupil-constricting drops, are sometimes paused in the operated eye only for specific procedures. Bring the bottles with you and ask on arrival if anything is unclear, rather than skipping a dose.

What is the glaucoma surgery recovery time for a trabeculectomy?

The eye typically feels gritty and looks blurry for the first one to two weeks, with frequent clinic visits to check pressure and sometimes adjust sutures. Healing settles over roughly the following four to six weeks while steroid drops are gradually tapered. Full stabilization of pressure can take longer, and drops in the operated eye may be stopped, continued or reintroduced depending on readings. Laser procedures recover far faster, often within a day.

What should I bring on the day of glaucoma surgery?

Bring your appointment letter, your complete medicine list or the actual bottles including eye drops and supplements, your glasses, sunglasses for the journey home, hearing aids if you use them, and the phone number of the person collecting you. If you have fasted, pack a snack for afterward. Wear a front-opening top so you do not have to pull clothing over the operated eye, and leave jewelry and eye makeup at home.

Can I eat breakfast before glaucoma surgery?

It depends on the anesthesia plan. For laser procedures and many operations under local anesthetic alone, a light breakfast is often allowed and sometimes encouraged. If sedation or general anesthesia is planned, you will be given a cut-off time for food and a later one for clear fluids, and eating after that time can lead to cancellation for safety. People with diabetes receive a specific plan for their medicines.

Will I still need eye drops after glaucoma surgery?

Possibly. Some people stop pressure-lowering drops in the operated eye, some reduce them, and some need them again later if the drainage pathway scars over time. Nearly everyone uses a short course of antibiotic and steroid drops after surgery. The other eye continues its usual treatment throughout. Surgery is a way of controlling pressure alongside drops, not a permanent replacement for ongoing glaucoma care.

What symptoms after glaucoma surgery mean I should call the same day?

Call immediately for increasing pain with nausea, a sudden marked drop in vision or a curtain across your sight, rapidly worsening redness with discharge or hot swollen lids, fluid trickling from the eye, new flashes or a shower of floaters, or any injury to the eye. If a blood thinner was paused, chest pain, one-sided weakness or a swollen painful calf are emergencies. Mild blur and grittiness alone in the first week are expected.

References

• National Eye Institute (NIH): Glaucoma Surgery
• MedlinePlus: Glaucoma
• Cleveland Clinic: Glaucoma

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.