Learn How to Prepare for Cataract Surgery

Understanding Cataracts and Why Surgery May Be Recommended

A cataract is a clouding of the eye's natural lens. The lens sits behind the colored part of your eye (the iris) and works like a camera lens to focus light on the back of the eye. When a cataract develops, the lens becomes progressively cloudy, making vision blurry, dim, or yellowed. This happens gradually over months or years as proteins in the lens clump together.

According to the National Eye Institute, cataracts affect more than 24 million Americans aged 40 and older. By age 75, about half of all Americans have either a cataract or have had cataract surgery. Cataracts develop for several reasons: aging is the most common cause, but they can also result from eye injury, prolonged sun exposure, certain medications (like corticosteroids), diabetes, or smoking.

Your eye doctor may recommend cataract surgery when the clouding interferes with your daily activities. This might happen when you struggle to read, drive safely, recognize faces, or work. However, surgery is not urgent unless the cataract is causing other eye problems. Many people live with mild cataracts without needing surgery right away. Your doctor will discuss whether surgery is the right choice for your situation based on how much the cataract affects your vision and quality of life.

The procedure itself is one of the most commonly performed surgeries in the United States, with approximately 3.6 million cataract surgeries done each year. Modern cataract surgery is outpatient, meaning you go home the same day. The surgery usually takes about 15 minutes per eye and involves removing the cloudy lens and replacing it with an artificial intraocular lens (IOL).

Practical takeaway: Understanding that cataracts are a normal age-related condition and that surgery is elective—not an emergency—helps you approach preparation without anxiety. Discuss with your eye doctor the specific symptoms affecting your life to determine your timeline for surgery.

Medical Tests and Evaluations Before Surgery

Before cataract surgery, your eye doctor will perform several tests to measure your eye and plan the surgery. These tests are painless and take about 30 to 45 minutes. The most important measurement is the length of your eye and the curve of your cornea (the clear front layer). These measurements determine the power of the artificial lens your surgeon will implant. Getting this measurement correct is crucial because it affects how well you see after surgery.

You will have your vision tested using standard eye charts. Your eye pressure will be measured to check for glaucoma. Your doctor will also examine the back of your eye (retina) using special equipment. If you have other eye conditions like macular degeneration or diabetic retinopathy, your doctor needs to know this before surgery because these conditions may affect your vision results after the cataract is removed.

Your surgeon will ask about your general health, medications, and allergies. This is important because some conditions and medications can affect surgery or healing. Tell your doctor about all medications you take, including over-the-counter drugs and supplements. Certain blood thinners like warfarin or aspirin may need to be adjusted before surgery, but only your doctor can make this decision—do not stop taking any medication without medical guidance.

If you wear glasses or contact lenses, your prescription will be measured. If you have astigmatism (a common focusing problem), your surgeon may use special techniques or toric IOLs to correct it during surgery. Some people choose premium IOLs that reduce the need for glasses after surgery, though these cost more and may not be covered by insurance.

Practical takeaway: Bring a complete list of all medications and supplements to your pre-surgery appointment. Ask your doctor which measurements will determine your IOL choice and whether you have options for the type of lens implanted.

What to Do in the Two Weeks Before Surgery

The two weeks leading up to surgery are when you'll make important practical arrangements and follow specific instructions from your surgeon's office. First, arrange transportation. You cannot drive yourself home after surgery because the sedative used during the procedure will affect your alertness and reaction time. The sedative wears off within a few hours, but it's unsafe to drive immediately. Arrange for a family member or friend to pick you up, or plan to use a taxi or rideshare service with a driver you know.

Stop wearing contact lenses according to your doctor's instructions—typically 2 to 3 weeks before surgery, or longer for hard contacts. Your eye measurements need to be accurate, and contacts change the shape of your cornea temporarily. Wear glasses during this period instead. If you had eye measurements done while wearing contacts, your doctor will have accounted for this, but follow their specific guidance.

About one week before surgery, your surgeon's office will provide detailed instructions about medications. You may be asked to stop taking certain medications a few days before surgery. For example, some blood thinners are paused temporarily. You may need to start antibiotic eye drops a day or two before surgery. Read all instructions carefully and ask questions if anything is unclear.

Plan your surgery day schedule. Eat a light breakfast (unless told otherwise), and take your regular morning medications unless instructed differently. Wear comfortable, loose clothing. Avoid wearing makeup, perfume, or aftershave to the surgery center. These can interfere with the sterile environment. Arrange to have someone with you for at least 24 hours after surgery to help with activities and watch for any problems.

Practical takeaway: Create a checklist of pre-surgery instructions from your surgeon and check off each item as you complete it. Confirm your transportation arrangement at least a week before surgery so there are no last-minute problems.

Managing Medications and Health Conditions Before Surgery

If you take blood thinners such as warfarin (Coumadin), aspirin, or clopidogrel (Plavix), talk with your eye surgeon and your primary care doctor about whether to continue these medications. Some surgeons prefer patients to continue blood thinners to prevent blood clots in the body, while others may want to pause them briefly. Do not make this decision on your own—these medications are important for your health, and stopping them without medical guidance could be dangerous.

If you have diabetes, bring your blood sugar log or monitoring device to your pre-surgery appointment. Good blood sugar control before and after surgery promotes healing. Some people need to adjust their diabetes medications on surgery day because they'll be fasting. Your doctor will give you specific instructions. Generally, you may take some diabetes medications with a sip of water, but confirm this with your surgeon.

If you have high blood pressure, continue taking your blood pressure medication. Elevated blood pressure on surgery day can increase bleeding risks. If you have heart disease or take heart medications, mention this to your surgeon. Your surgeon may coordinate with your cardiologist before scheduling surgery.

If you have a cold, sinus infection, or other illness close to your surgery date, contact your surgeon's office. These conditions can sometimes be postponed to allow you to recover first. Also mention if you have a skin condition like eczema or rosacea around the eye area, as this affects how sterile draping will be applied.

Start using any prescribed pre-surgery eye drops exactly as directed. These drops reduce inflammation and prevent infection. Use them on the correct schedule and in the correct eye—some drops go in the surgical eye, while others may go in the non-surgical eye to protect it during the procedure.

Practical takeaway: Create a written schedule of when to take each pre-surgery medication and eye drop. Show this schedule to your surgeon's office staff to confirm you have it right, since timing matters for surgery day.

What Happens on Surgery Day and What to Expect

Arrive at the surgery center about 15 minutes before your scheduled time. You'll check in and move to a pre-operative area where staff will verify your identity and which eye is being operated on. This verification happens multiple times as a safety measure. You'll change into a surgical gown and be asked to remove jewelry, watches, and hearing aids or dentures if you have them. You can keep your glasses if needed to see better before surgery.

A nurse will start an IV line in your arm for sedation and fluids. You'll meet your anesthesiologist, who will discuss the sedation plan. You'll receive a mild sedative that makes you drowsy