Eye Surgery Prep Checklist: Medication Lists, Allergies, Fasting Rules and the Drop Plan

The envelope arrives with the appointment letter, and it is thicker than expected. Three pages of instructions, a form asking for every tablet in the bathroom cabinet, a question about shellfish, a line about eye drops that have not yet been prescribed. For a procedure that will take less time than a lunch break, the paperwork feels out of proportion.

It is not. Learning how to prepare for eye surgery is mostly about removing surprises: the anesthetist who discovers a blood thinner on the morning of the operation, the surgeon who meets a pupil that will not stay open, the patient who arrives having eaten a full breakfast before planned sedation. Each of those is a common reason a case is postponed.

This guide walks through the four pieces that matter most, in the order a pre-assessment nurse would take them: medicines, allergies, fasting and the drop plan. Where a figure or timeframe appears, it comes from a named public health source, and every decision stays with the team looking after your eye.

How to prepare for eye surgery: why the checklist looks the way it does

A pre-assessment is the appointment, often by phone, where a nurse gathers your medical history before a planned operation. Its questions can seem repetitive, but each one maps onto a specific risk the team is trying to manage.

Eye operations are unusual among surgeries. Most cataract procedures are done under a local anesthetic, meaning the eye is numbed with drops or an injection while you stay awake, and the NHS notes the operation itself usually takes 30 to 45 minutes with a same-day discharge. That makes the stakes of a missed detail feel small. Yet the eye is a tiny, pressurized, blood-rich organ, and the medicines you take for your prostate, your heart or your joints can change how it behaves under the microscope.

So the checklist has four load-bearing parts. The medication list tells the surgeon what your pupil and your blood will do. The allergy list decides which antiseptic, anesthetic and antibiotic the team can safely use. The fasting instructions depend entirely on the type of anesthesia planned, which is why two people having the same operation may receive different rules. The drop plan covers both the days before, when some units ask you to start drops early, and the weeks after, when consistent use matters for healing.

One honest framing helps: none of this is a test you can fail. Telling the team about a supplement you forgot, or a meal you ate, is always better than staying quiet. Postponements are frustrating, but they are the system working as intended, protecting the eye from a preventable complication.

The sections that follow take each pillar in turn, then look at what the days after surgery usually involve and which myths cause the most trouble.

What actually happens on the day of eye surgery

Most people picture the operation itself. In reality, the surgical part is a short chapter in a longer day, and knowing the sequence lowers anxiety more than any reassurance can.

You arrive, usually without makeup, jewelry or contact lenses, and a nurse confirms your identity, the eye being operated on and your fasting status. A mark is often placed above the correct eye. Then come the pre-operative drops. For cataract surgery these typically include a dilating drop, which relaxes the iris so the pupil widens and the surgeon can reach the lens, and sometimes an antibiotic or anti-inflammatory. Dilation takes time, so this waiting period can stretch to an hour or more and is the part patients most often underestimate.

Just before the procedure, the skin around the eye and the eye surface are cleaned with an antiseptic, most commonly a povidone-iodine solution. A sterile drape covers your face with a small window over the eye, and a gentle device holds the lids open so you do not need to worry about blinking.

Cataract surgery itself, as described by MedlinePlus, involves a very small incision, breaking up the cloudy natural lens with ultrasound energy, removing the fragments and placing an artificial lens in the same capsule. You will see light and movement, hear the surgeon’s voice and feel pressure rather than pain. Laser vision correction and retinal procedures follow their own sequences, but the checking, dropping, cleaning and draping rhythm is much the same.

Afterwards a shield or pad is placed over the eye, you rest briefly, receive your drop schedule in writing and go home with the person who came with you. The Mayo Clinic notes you will not be able to drive and should arrange a ride in advance.

Who eye surgery is usually for, and who is usually asked to wait

Eligibility is a decision made by an ophthalmologist, a doctor who specializes in medical and surgical eye care, after an examination. Still, a few patterns are consistent enough across guidance to describe.

Cataract surgery is generally offered when a cloudy lens is interfering with daily life: reading, driving, recognizing faces or managing glare. The NHS is clear that surgery is the only way to improve vision affected by cataract and that there is no need to wait for it to “ripen.” Laser vision correction is usually considered for adults whose glasses prescription has been stable, with adequate corneal thickness and healthy eye surfaces. Retinal surgery is often time-sensitive and is scheduled around the condition rather than convenience.

Who is asked to wait? The most common reason is an active infection or inflammation. Conjunctivitis, a flare of blepharitis (inflammation along the eyelid margins), a cold sore near the eye or an untreated eyelid stye can all lead to a short postponement, because introducing surgery into an inflamed environment raises the risk of infection inside the eye. Poorly controlled blood pressure or blood glucose on the day is another frequent reason for delay, as is a chest infection when sedation or general anesthesia is planned.

Pregnancy and breastfeeding usually mean laser vision correction is deferred, since hormonal shifts can change the corneal shape and prescription. Recent changes to blood-thinning or prostate medicines can prompt rescheduling until the surgeon has a clear picture.

None of these are judgments about you. They are conditions that make the operation less predictable, and the safest response to unpredictability is to wait a few weeks and try again with the odds improved.

Why your medication list matters more than it seems

Write it down before the pre-assessment call, and include everything: prescriptions, inhalers, patches, over-the-counter painkillers, herbal remedies, vitamins and eye drops you already use. Nurses ask about supplements because some of them affect bleeding or interact with sedation, and patients rarely think of them as medicines.

Three groups deserve particular care. The first is anything that thins the blood: anticoagulants such as warfarin or the newer direct oral anticoagulants, and antiplatelet drugs such as aspirin or clopidogrel. Cataract surgery involves very little bleeding, and many patients continue these medicines, but retinal and eyelid procedures are different. The Mayo Clinic notes a surgeon may advise temporarily adjusting a medicine that could increase bleeding risk. Never make that change yourself; it is a conversation between your surgeon and the doctor who prescribed the medicine, weighing your clot risk against the surgical risk.

The second group is alpha-blockers, medicines prescribed for prostate symptoms or occasionally blood pressure, with tamsulosin the best known. They relax smooth muscle, including the muscle of the iris. During cataract surgery this can cause a condition called intraoperative floppy iris syndrome, in which the pupil narrows and the iris billows toward the incision. The Mayo Clinic specifically advises telling your surgeon if you take these medicines. Surgeons have techniques to manage it, but only if they know in advance. Stopping the drug beforehand does not reliably reverse the effect, which is another reason not to alter it on your own.

The third group is diabetes medicines, including insulin, because fasting changes glucose control. Some newer diabetes and weight-management injections slow stomach emptying, and anesthesia services increasingly ask about them before sedation. Your team will tell you what to take on the morning of surgery; MedlinePlus advises asking exactly that question.

Which allergies your eye surgery team needs to know about

The allergy question on the form is broader than most people expect, because an eye operation exposes you to several substances you may never have encountered by name.

Start with antiseptics. Povidone-iodine is the standard skin and eye-surface preparation before eye surgery because it reliably reduces bacteria and lowers the risk of infection inside the eye. True allergy to it is uncommon, but it exists and matters. A persistent myth links shellfish allergy to iodine allergy. The two are unrelated: shellfish reactions are to proteins in the seafood, not to iodine, and mainstream allergy guidance does not treat shellfish allergy as a reason to avoid iodine antiseptics. Mention the shellfish allergy anyway, since sedation teams like a full picture, but expect to be reassured.

Next, local anesthetics. If you have ever had a reaction at the dentist, describe what happened. Fainting, racing heart or feeling unwell after an injection is usually a response to adrenaline in the mixture or to anxiety rather than a true allergy, and the distinction changes what the team does.

Antibiotics come third. Eye surgery commonly involves antibiotic drops before or after, and sometimes an antibiotic placed inside the eye at the end of cataract surgery. Penicillin, sulfonamide and fluoroquinolone allergies all influence which agent is chosen, so name the drug and the reaction rather than saying “antibiotics.”

Finally, the practical ones: latex, adhesive tape and dressings, and preservatives in eye drops. Many post-operative drops contain the preservative benzalkonium chloride, and people with sensitive eyes or dry eye sometimes react to it. Preservative-free alternatives exist for some medicines, and the time to ask is before the prescription is written, not on day three when your eye is stinging.

Can you eat before eye surgery? Fasting rules explained

This is the question that causes the most confusion, and the honest answer is that it depends on the anesthesia planned, which is why you should follow your own written instructions over anything you read, including this article.

Fasting exists to protect the airway. If a person is sedated or given a general anesthetic with food in the stomach, the normal reflexes that stop stomach contents entering the lungs are weakened. For a cataract operation done purely under local anesthetic drops, with you awake and no sedation, that risk is minimal, and many units allow a light meal beforehand. The moment sedation enters the plan, the rules tighten. The Mayo Clinic notes that patients may be instructed not to eat or drink for 12 hours before cataract surgery, reflecting how varied local protocols can be.

Where general anesthesia is used, most commonly for children, for some retinal procedures and for adults who cannot lie still, anesthesia services in the UK and US typically publish a two-tier rule: no solid food for around six hours before, and clear fluids such as water permitted until about two hours before. Milk counts as food. Chewing gum and sweets are usually included in the ban. Your letter will state your unit’s version, and it is the one that applies.

People with diabetes need an individual plan, because fasting while taking glucose-lowering medicine can cause hypoglycemia. Units often schedule these patients early in the day and give written guidance about which medicines to hold or take. Ask for that guidance if it does not arrive.

One more point: if you do eat or drink by mistake, say so at check-in. The team may proceed if you were only having local anesthetic, or may reschedule. Either outcome is safer than an undisclosed breakfast.

Eye drops before eye surgery: the pre-op drop plan

Not everyone is given drops to start at home, and this is a common point of worry. Whether you are depends on the operation and the unit’s protocol, so an empty prescription bag is not a mistake.

When pre-operative drops are prescribed, they usually fall into two categories. Antibiotic drops aim to reduce bacteria on the eye surface in the days leading up to surgery. Anti-inflammatory drops, often from the non-steroidal class, are sometimes started before cataract surgery to help keep the pupil dilated during the operation and to reduce swelling of the retina afterwards. Both classes are described here to explain mechanism, not to suggest anyone should ask for them.

Timing matters. If your instructions say to begin a certain number of days before, start on that day, not earlier or later. If you are already using drops for glaucoma, dry eye or another condition, ask specifically whether to continue them, because the usual answer is yes for glaucoma drops and sometimes a pause for others. Bring every bottle to the pre-assessment or photograph the labels.

Contact lenses are the other pre-operative rule people overlook. Soft lenses alter the shape of the cornea slightly and rigid lenses do so more. Before cataract surgery, measurements for the artificial lens are taken from the cornea, and before laser vision correction the whole plan depends on its true shape. The Mayo Clinic advises stopping contact lens wear for a period before laser surgery, with the exact duration set by the surgeon according to lens type. Wear glasses in the run-up.

On the morning itself, most units ask you not to apply eye makeup, face cream near the eyes or perfume. Cleaning the lid margins gently with a warm, damp cloth for a few days before, if your team recommends it, can reduce surface bacteria without irritating the eye.

Building a post-op drop chart you can actually follow

Recovery from eye surgery is largely done at your bathroom sink. After cataract surgery, the NHS notes that drops are usually needed for around four weeks, with a schedule that steps down over time. Adherence is where good outcomes are quietly won or lost, and the tool that helps most is a paper chart.

Make a simple grid: bottles down the side, times of day across the top, one page per week. Tick each box as you go. If two different drops are due at the same time, leave a gap of about five minutes between them so the first is not washed out by the second, a spacing recommendation that appears across NHS and Mayo Clinic drop guidance. If one of your drops is a thicker gel or ointment, it goes last.

Technique is the other half. Wash your hands. Tilt your head back, look up, and gently pull the lower lid down with a clean finger to make a small pocket. Squeeze one drop into the pocket without letting the bottle tip touch the eye, lashes or fingers. Close the eye gently, do not squeeze, and press lightly on the inner corner by the nose for a moment; this closes the tear duct so more medicine stays on the eye. If you miss, do not panic; a second drop is fine for most medicines, but check with your team.

Some practical realities: bottles have short lives once opened, often around four weeks, and the label will say. Store them as directed. If arthritis or a tremor makes squeezing hard, ask about drop-aid devices or whether a family member can help. And after any operation, the unit’s written sheet overrides a general article. Keep it taped to the mirror beside the chart.

Eye surgery pre-op instructions week by week

Instructions arrive in one dense letter, but they unfold over a timeline. Laying them out by week turns a wall of text into a set of small tasks. This table is a general pattern; your unit’s sheet is the authority.

When	What usually happens or needs doing
Several weeks before	Pre-assessment call or visit; written medication and allergy list handed over; blood thinner and alpha-blocker plan agreed between surgeon and prescriber; contact lens pause begins if required for measurements
1–2 weeks before	Confirm ride home and someone at home for the first night; collect any pre-operative drops; report any new cold, eye redness or cold sore to the unit
The days before	Start pre-op drops if prescribed, on the stated day; gentle lid hygiene if advised; set up the drop chart and a clean space at home
The night before	Follow fasting instructions exactly, including on fluids and gum; lay out loose, front-opening clothing; charge your phone for the appointment call
The morning	Take only the medicines the team said to take; no eye makeup, lotions or contact lenses; bring your medicine list, glasses and a case; leave valuables at home
After discharge	Begin the post-op drops at the time stated; wear the shield as instructed, including at night; keep the first follow-up appointment

Two details from this table deserve emphasis. First, the ride home is not optional; the operated eye is blurry, the other may be dilated, and both the NHS and Mayo Clinic advise against driving until your surgeon confirms you meet the legal standard. Second, reporting a new infection before the day, rather than hoping it clears, saves a wasted journey and gives the team time to offer another slot.

What to do before cataract surgery versus laser or retinal surgery

The four pillars apply to every eye operation, but the emphasis shifts with the procedure. Knowing where your operation sits on the spectrum helps you ask sharper questions.

Before cataract surgery, the medication list carries the most weight. The alpha-blocker question exists almost entirely because of cataract surgery, and lens measurements depend on a cornea free of contact lens distortion. Fasting is usually light or absent when only local anesthetic drops are planned, and the pre-operative drop regimen, if any, tends to be short. The NHS describes a typical experience of going home the same day with drops to use for around four weeks and a full recovery period of roughly two to six weeks.

Before laser vision correction, the cornea is the whole story. Contact lens abstinence is longer and stricter, the surface must be free of dry eye flare or blepharitis, and the Mayo Clinic notes that surgeons look for a stable glasses prescription and adequate corneal thickness. Fasting rules are usually minimal because the procedure is done under numbing drops without sedation, though each provider sets its own. Medication questions focus on drugs that affect healing or dry eye.

Before retinal surgery, blood thinners take center stage because bleeding inside the eye is a more meaningful risk, and general anesthesia or deeper sedation is more common, which brings full fasting rules. Recovery may involve positioning, such as keeping the head in a particular orientation if a gas bubble has been placed in the eye, and the NHS warns that flying is unsafe with a gas bubble because altitude expands it and raises eye pressure. That instruction must come from your surgeon with a specific timeframe.

Whatever the procedure, the unit’s own sheet is the one to follow when it differs from anything general.

What the days and weeks after eye surgery usually look like

The first evening is often anticlimactic. The eye is covered, the anesthetic is wearing off, and there is a gritty, scratchy feeling like an eyelash that will not shift. The NHS describes this along with mild aching, watering and blurred vision as normal in the early days after cataract surgery. Simple pain relief that you already take safely is usually fine; ask the unit which.

By the next morning, when many units ask you to remove the shield and start drops, vision is frequently better than the night before, though it fluctuates. Colors can look startlingly vivid after cataract surgery because the yellowed lens is gone. The Mayo Clinic notes that vision may be blurry at first and that full healing often takes around eight weeks, with follow-up visits commonly in the first day or two, the following week and around a month later.

The middle stretch is about discipline rather than drama. Drops continue on their stepping-down schedule. The NHS advises avoiding rubbing the eye, keeping soap and shampoo out of it, wearing the shield at night for at least the first week, and avoiding swimming for four to six weeks. Strenuous exercise and heavy lifting are typically paused for a few weeks. Reading, screens and gentle walks are usually fine from early on.

Glasses are the last piece. After cataract surgery your old prescription will be wrong, and most people wait several weeks for the eye to settle before a new test. Driving requires that your vision meet the legal standard, which the surgeon or optometrist confirms.

Timelines here are typical ranges drawn from the sources cited, not promises. Some eyes settle faster, some slower, and the follow-up visits exist precisely to catch the ones that need more time or attention.

What people often get wrong about preparing for eye surgery

Some errors are so common that pre-assessment nurses can predict them. Correcting them in advance is worth more than any reassurance on the day.

“I’ll just stop my blood thinner to be safe.” Stopping an anticoagulant without medical advice can lead to a stroke or clot, a far more serious event than the small bleeding risk of most eye surgery. The decision belongs to your surgeon and prescriber together.

“Supplements aren’t medicines, so I didn’t list them.” Herbal products and high-dose vitamins can affect bleeding and interact with sedation. Every capsule goes on the list.

“I’m allergic to shellfish, so I can’t have the iodine wash.” The two are unrelated, as covered earlier. Mention it; expect reassurance.

“My cataract needs to ripen first.” The NHS states there is no such requirement; surgery is offered when the cataract affects your life.

“Fasting means nothing at all, not even my heart tablet.” Most units want essential medicines taken with a sip of water even during fasting. Ask which ones.

“Nothing to eat means I can have a milky coffee.” Milk is a food for fasting purposes. Clear fluids means water and drinks you can see through, up to the stated cut-off.

“I’ve worn contact lenses for years; a few days won’t matter.” Lens-induced corneal warping can skew the measurements that determine your implant or laser plan. The pause is not a formality.

“Drops are optional once the eye feels fine.” Inflammation inside the eye is not always felt. The stepping-down schedule exists to prevent problems you cannot sense, and stopping early is a leading cause of avoidable setbacks.

“I can drive myself home; it’s only one eye.” Blur, dilation and residual sedation all impair judgment and vision. Arrange the ride.

Questions to ask your care team before eye surgery

A pre-assessment is a two-way conversation, and the best-prepared patients arrive with their own short list. Write the answers down; sedation and nerves erase memory reliably.

On anesthesia and fasting, ask what type is planned for you specifically, and therefore what the exact fasting cut-offs are for food and for clear fluids. Ask which of your regular medicines to take that morning and with how much water. If you have diabetes, ask for the written plan for your glucose medicines during the fast and whether you will be scheduled early.

On medicines, ask whether any of your drugs, particularly blood thinners and prostate medicines, change the surgical plan, and confirm that no adjustment is expected of you unless the surgeon has spoken with your prescriber. Ask whether to continue your existing eye drops, especially glaucoma drops.

On the drop plan, ask whether you will start drops before surgery and on which day; how many different drops you will use afterwards and for roughly how long; how far apart to space them; whether preservative-free options are available if your eyes are sensitive; and what to do if you miss a dose or the bottle runs low before the schedule ends.

On logistics, ask how long to expect to be in the unit, whether an escort must stay, when you may remove the shield, and when the first follow-up will be. Ask who to call out of hours and what symptoms should trigger that call.

On the procedure itself, ask what sensations to expect, what the realistic range of visual results is for your eye, what the main risks are and what the alternatives would be, including waiting. A team that welcomes these questions is a team that has thought about them.

When to call your doctor after eye surgery

Most recovery days are uneventful, and the gritty, watery, slightly blurry first week described by the NHS is expected. Certain changes are not, and the general rule is simple: if something is getting worse rather than better, call the number on your discharge sheet rather than waiting for the scheduled appointment.

Seek urgent advice, the same day, if you notice any of the following:

• Pain that is increasing, deep or severe, or pain not eased by the simple relief your team approved
• Vision that is getting worse after an initial improvement, or a sudden drop in vision
• A new shower of floaters, flashes of light, or a dark curtain or shadow moving across part of your vision, which the NHS lists as possible signs of retinal detachment
• Increasing redness, a sticky yellow or green discharge, or an eyelid that is swelling shut
• Nausea and vomiting with eye pain, which can indicate a sharp rise in pressure inside the eye
• A fever together with any of the above

Infection inside the eye after surgery is rare but serious, and it typically declares itself within the first days with escalating pain, worsening vision and redness. Treated early, the outlook is far better than treated late, which is why units repeat this list at discharge.

Less urgent but still worth a call: a drop bottle you cannot manage, a reaction you suspect is to a preservative, a missed day of drops, or uncertainty about whether an activity is safe. Before surgery, contact the unit if you develop a cold, a cold sore, red or sticky eyes, or a change in your medicines.

Every judgment about what your symptoms mean, and every change to your drops or medicines, belongs to the team that operated on your eye. This article is a map; they hold the compass.

Frequently asked questions

Can you eat before eye surgery if it is only under local anesthetic?

Often yes, but only if your written instructions say so. When cataract surgery is done with numbing drops and no sedation, many units allow a light meal beforehand. As soon as sedation or general anesthesia is planned, fasting rules apply, typically no solid food for several hours and clear fluids until a stated cut-off. Follow your own unit’s letter, and tell the team if you ate by mistake.

What eye drops are used before eye surgery, and does everyone get them?

Not everyone does. Some units prescribe antibiotic drops to lower surface bacteria, or anti-inflammatory drops to help keep the pupil dilated and reduce swelling afterwards, starting a set number of days before. Others give all drops on the day. On arrival you will usually receive dilating drops that widen the pupil, followed by an antiseptic wash just before the operation. An empty prescription bag is not an error.

What are typical eye surgery pre-op instructions for the morning itself?

Take only the medicines your team told you to take, with a small amount of water if fasting. Avoid eye makeup, face creams near the eyes and perfume. Leave contact lenses out and wear glasses. Bring your medicine list, your glasses and case, and a companion who can take you home. Wear loose, front-opening clothing, because a drape will cover your face and you will want to be comfortable.

What should I do before cataract surgery about my blood thinner?

Do not change it on your own. Cataract surgery involves very little bleeding, and many people continue anticoagulant or antiplatelet medicines throughout. If any adjustment is needed, your surgeon will agree it with the doctor who prescribed the medicine, weighing your clot risk against surgical bleeding risk. Stopping a blood thinner without advice can lead to a stroke or clot, which is far more serious than the surgical risk.

Why does the pre-assessment nurse ask about my prostate medicine?

Because alpha-blockers such as tamsulosin relax the iris muscle as well as the prostate, which can cause the pupil to narrow and the iris to flutter during cataract surgery, a condition called intraoperative floppy iris syndrome. Surgeons have techniques to manage it when forewarned. Stopping the medicine beforehand does not reliably prevent it, so the instruction is to disclose, not to discontinue.

I am allergic to shellfish. Can I still have the iodine eye wash?

In almost all cases yes. Shellfish allergy is a reaction to proteins in the seafood, not to iodine, and mainstream allergy guidance does not link the two. Povidone-iodine is the standard antiseptic before eye surgery because it reliably reduces infection risk. Report the shellfish allergy anyway so the team has a full picture, and separately mention any past reaction to iodine antiseptics or contrast dyes.

How long do I need to stop wearing contact lenses before eye surgery?

It depends on the lens type and the procedure, and your surgeon sets the exact period. Soft lenses alter corneal shape slightly and rigid lenses more, which can skew the measurements used to select an artificial lens for cataract surgery or to plan laser vision correction. The Mayo Clinic notes that laser surgeons typically ask patients to switch to glasses for a period before assessment and treatment.

What does preparing for your care mean if I have diabetes?

It means getting a written, individual plan for the fast. Going without food while taking glucose-lowering medicines can cause low blood sugar, so units often schedule people with diabetes early in the day and specify which medicines to hold or take that morning. Ask for this plan at pre-assessment if it is not offered, and bring a way to check your glucose on the day.

How long do I use eye drops after cataract surgery?

The NHS describes a typical course of around four weeks, usually stepping down in frequency over that time, though your surgeon may set a different length based on how your eye heals. The drops manage inflammation and infection risk that you cannot always feel, so completing the schedule matters even when the eye feels comfortable. Keep a paper chart and bring your bottles to follow-up appointments.

What happens if I have a cold or an eye infection on the day of surgery?

Tell the unit as early as possible, ideally before you travel. Active eye infection, blepharitis flare or a cold sore near the eye usually means a short postponement, because operating on an inflamed eye raises infection risk. A chest cold matters most when sedation or general anesthesia is planned. Rescheduling is frustrating, but it is the safer path and gives the team time to offer another slot.

References

• NHS: Cataract surgery, what happens
• NHS: Cataract surgery, recovery
• MedlinePlus: Cataract removal
• NHS: Detached retina (retinal detachment)

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.