Preparing for cataract surgery starts one to two weeks before your procedure and involves a mix of eye measurements, medication adjustments, a prescribed drop regimen, and practical planning for the day itself. Most of the preparation is straightforward, but a few details (especially around medications you already take) can directly affect how smoothly the surgery goes.
Eye Measurements That Determine Your New Lens
Before surgery, your ophthalmologist needs precise measurements of your eye to select the right artificial lens. This process, called biometry, measures two things: the curvature of your cornea and the length of your eye from front to back. Together, these numbers determine the focusing power of the lens implant so your vision comes out as close to your target as possible.
Corneal curvature is typically measured with a device called a keratometer, which takes just a few seconds while you look into the instrument. If you have an unusually flat or steep cornea, significant astigmatism, or a history of LASIK or other refractive surgery, your surgeon may use corneal topography instead, which maps the entire surface in finer detail. Eye length is measured with a quick, painless laser-based scan. Ultrasound is used as a backup when the laser method can’t get an accurate reading, such as when a very dense cataract blocks the light.
These measurements usually happen at a pre-operative appointment one to two weeks before surgery. Accuracy matters here: the lens power calculation is the single biggest factor in your post-surgical vision quality, so don’t be surprised if the technician repeats measurements or asks you to remove contact lenses days in advance (contacts can temporarily reshape your cornea and throw off the readings).
Medications to Discuss With Your Surgeon
Blood Thinners and Aspirin
If you take a blood thinner like warfarin or a daily aspirin, you likely do not need to stop it. The American Academy of Ophthalmology supports continuing blood thinners and antiplatelet drugs through cataract surgery rather than pausing them beforehand. Cataract surgery involves very small incisions with minimal bleeding risk, and stopping these medications can create a far more dangerous clotting risk. That said, confirm this with both your eye surgeon and the doctor who prescribed the blood thinner, since individual circumstances vary.
Prostate Medications (Alpha-Blockers)
This one catches many patients off guard. If you take tamsulosin (commonly known as Flomax) or another alpha-blocker for an enlarged prostate, tell your eye surgeon well in advance. These drugs can cause a complication during surgery where the iris becomes floppy and difficult to manage, leading to poor pupil dilation, iris tissue getting pulled into the incision, and in serious cases, damage to the back of the lens capsule. In one study, major complications occurred in 15% of patients who developed this condition.
Your surgeon may ask you to stop the medication before surgery, or they may simply plan for it by using specialized techniques. If cataract surgery is already scheduled and you haven’t yet started an alpha-blocker for prostate symptoms, your doctors may recommend delaying the prostate medication until after your eyes are done. The key step for you is simply making sure your eye surgeon knows about the medication, even if another doctor prescribed it.
Pre-Surgical Eye Drops
Your surgeon will prescribe eye drops to start before surgery day, typically beginning about three days prior. A common regimen includes an antibiotic drop (to reduce bacteria on the eye’s surface) used four times daily, and an anti-inflammatory drop used once daily. Both continue after surgery as well. The antibiotic course usually lasts about two weeks post-op, while the anti-inflammatory may continue for four weeks.
Follow the timing and frequency exactly as prescribed. These drops are your primary defense against infection and excessive inflammation. If you’re unsure about the spacing between different drops, a good rule is to wait at least five minutes between each one so the first drop isn’t washed out by the second.
Eyelid Hygiene in the Days Before
Your surgeon may ask you to clean your eyelids twice daily for about five days before surgery. The goal is to reduce the bacterial load on your eyelid margins and lashes, which sit right next to the surgical site. The technique is simple: apply a warm compress to your closed eye for a minute, then gently massage the upper lid inward and downward and the lower lid inward and upward to loosen debris. Finish by wiping each lid from the inner corner outward with a sterile eyelid wipe or a clean pad with diluted baby shampoo. Pre-moistened lid scrub pads are available over the counter and make this easier.
Medical Clearance: Who Needs It
Not everyone needs a full physical exam before cataract surgery. A large randomized trial found that routine pre-operative testing, including blood work, clotting studies, and EKGs, provided no measurable benefit in preventing complications on surgery day or in the week following.
However, certain patients do benefit from a medical evaluation within 30 days of surgery. You fall into this category if you can’t lie flat comfortably, experience chest pain or significant shortness of breath with minimal activity, have a pacemaker or implantable defibrillator, have had a recent heart attack, are on dialysis, or take insulin. Patients who haven’t seen a primary care doctor recently or who have significant functional limitations should also get checked. If none of these apply to you, your surgical center may not require a separate clearance visit at all.
Fasting Before the Procedure
Cataract surgery uses sedation, so fasting rules apply even though you won’t be fully under general anesthesia. The American Society of Anesthesiologists guidelines break it down by what you’re consuming:
- Clear liquids (water, black coffee, apple juice without pulp): stop 2 hours before your procedure time.
- A light meal or milk (toast, crackers, a small bowl of cereal): stop 6 hours before.
- Heavy or fatty foods, fried foods, or meat: stop at least 8 hours before.
For most people with a morning surgery time, this means eating a normal dinner the night before and skipping breakfast. You can typically take essential morning medications with a small sip of water, but check with your surgical center about which specific pills to take and which to skip.
What to Wear and What to Leave at Home
Wear loose, comfortable clothing, ideally a two-piece outfit with a button-up or zip-up top. You’ll want to avoid pulling anything over your head after surgery when you have a protective shield on your eye. Skip all makeup, lotions, creams, perfume, and aftershave on surgery day. These products can introduce particles or chemicals into the sterile surgical environment. Leave jewelry at home, particularly earrings and necklaces that could get in the way.
Transportation and a Responsible Adult
You cannot drive yourself to or from cataract surgery. The sedation used during the procedure impairs your reflexes and judgment even after you feel alert, and surgical centers are required to release sedated patients only to a responsible adult. This person needs to be physically present to sign you out, not just waiting in the parking lot or available by phone.
Some surgery centers will not release patients to taxi or rideshare drivers, since those drivers aren’t considered responsible caregivers. If you don’t have a friend or family member available, professional surgical transportation services exist specifically for this purpose and include a caregiver who handles check-in and check-out. Confirm your center’s specific policy ahead of time so you aren’t scrambling on surgery day.
The Night Before and Morning of Surgery
The night before, do your final round of prescribed lid scrubs and eye drops. Lay out your button-up shirt and any paperwork or insurance cards you need to bring. Set an alarm that gives you enough buffer to arrive early, since most centers ask you to check in 30 to 60 minutes before your scheduled time.
On the morning of surgery, wash your face with mild soap and water but skip all cosmetic products. Use your prescribed eye drops on schedule. Take only the medications your surgical team has approved, with a small sip of water. Leave your contact lenses out (you should have stopped wearing them days earlier per your surgeon’s instructions). Bring sunglasses for the ride home, as your eyes will be light-sensitive afterward.