How cataract surgery works

Cataract surgery removes the clouded lens from your eye and replaces it with an artificial one. The surgeon makes a small opening in the front of your eye, breaks up the clouded lens using ultrasound or a laser, and suctions out the pieces. Then they insert a clear plastic lens — called an intraocular lens or IOL — that stays in your eye permanently. The whole procedure usually takes 10 to 20 minutes per eye.

Most cataract surgery is done as outpatient surgery, meaning you go home the same day. You will not be put to sleep; instead, the surgeon numbs your eye with drops and sometimes gives you a mild sedative to help you relax. You stay awake during the procedure but should not feel pain — only pressure or a sensation of movement.

Your eye surgeon will discuss which type of IOL works best for your vision needs and lifestyle. Some lenses correct distance vision only; others correct both distance and near vision, or distance and astigmatism. The choice depends on your eye health, your daily activities, and your budget, since some advanced lenses cost more than basic ones.

Key Takeaways

  • Cataract surgery is an outpatient procedure that takes 10 to 20 minutes and replaces your clouded lens with a permanent artificial one.
  • You will be awake during surgery but your eye will be numbed, and you should not feel pain — only pressure or movement.
  • Recovery takes about four to six weeks, during which you must use prescribed eye drops, avoid heavy lifting, and protect your eye from water and dust.
  • Your vision may be blurry or fluctuate for the first few weeks as your eye heals and adjusts to the new lens.
  • Complications are rare but can include infection, bleeding, or swelling; your surgeon will explain warning signs to watch for before you leave.

What to do before your surgery date

Your eye surgeon will schedule a series of measurements and tests weeks before your procedure. These tests map the shape and size of your eye so the surgeon can choose the right strength IOL for you. Bring a list of all medications and supplements you take, including blood thinners, because some may need to be paused before surgery.

Ask your surgeon which medications to stop and when. Blood thinners like warfarin or aspirin sometimes need to be held for a few days before surgery to reduce bleeding risk, but stopping them without guidance can be dangerous — your surgeon and your primary care doctor will coordinate this decision. You will also receive antibiotic eye drops to start a day or two before surgery to lower infection risk.

Arrange for someone to drive you home after surgery, since your eye will be dilated and your vision temporarily blurry. Plan to have help at home for the first few days if possible, especially with tasks like cooking, cleaning, or personal care. Wear comfortable, loose clothing on surgery day and avoid makeup, perfume, and lotions around your eye.

The first week after surgery

Your eye will feel scratchy, irritated, or mildly uncomfortable for the first few days — this is normal. You may see halos around lights or notice that colors look different; this usually fades as swelling goes down. Your vision will be blurry at first and may stay that way for a week or two while your eye heals.

Use your prescribed antibiotic and anti-inflammatory eye drops exactly as directed, usually four times a day for the first week. Set phone reminders if you tend to forget doses. Wash your hands before touching your eye or explore drops, and never let the dropper tip touch your eye or eyelid.

Avoid rubbing your eye, getting water in it during showers, or wearing eye makeup for at least one week. Do not do heavy lifting, strenuous exercise, or bending over, since these can raise pressure inside your eye and slow healing. Sleep with your head elevated on two or three pillows to reduce swelling.

Weeks two through six: gradual healing

By the second week, most people notice their vision is clearer, though it may still fluctuate day to day. Continue using your eye drops as prescribed — do not stop early even if your eye feels better. Swelling and inflammation can return if you stop drops too soon, and this can blur your vision again.

You can usually return to light activities like reading, watching television, and short walks by week two. Avoid swimming, hot tubs, and dusty or windy environments for at least four weeks. If you wear glasses or contacts, your prescription may change after surgery, so wait until your eye is fully healed before getting new glasses — usually four to six weeks after surgery.

Attend all follow-up appointments with your surgeon. These visits check your healing progress, measure your vision, and catch any problems early. Most surgeons see you the day after surgery, one week after, and again at four to six weeks.

Vision changes and what is normal

It is common for your vision to be slightly different in the operated eye compared to your other eye for the first few weeks. You may notice a slight tilt or size difference between what each eye sees — this usually resolves as both eyes adjust. If you had surgery on only one eye, you may feel off-balance or have trouble judging distances until your brain adapts, usually within a few days to a week.

Some people see better when ready; others take several weeks to notice improvement. If you had significant nearsightedness or farsightedness before surgery, you may still need glasses for reading or distance vision, depending on the IOL you chose. Your surgeon will discuss this with you before surgery so you know what to expect.

If your vision suddenly worsens, you see flashes of light, notice new floaters, or develop severe pain, contact your surgeon right away. These can be signs of complications like retinal detachment or infection, which need prompt treatment.

Possible complications and warning signs

Serious complications after cataract surgery are uncommon — most people heal without problems. However, infection, bleeding, swelling, or inflammation can occur. Posterior capsule opacification, where the membrane behind the IOL becomes cloudy, develops in some people months or years later; this is easily treated with a quick laser procedure in your surgeon's office.

Contact your surgeon when ready if you experience sudden vision loss, severe eye pain, increasing redness, discharge, or flashing lights. Do not wait for a scheduled appointment. If you cannot reach your surgeon, go to an urgent care center or emergency room and tell them you recently had cataract surgery.

Some people develop dry eye after surgery, especially if they had dry eye before. Your surgeon may recommend artificial tears, warm compresses, or prescription eye drops to manage this. Dry eye usually improves over time but can persist, so discuss long-term management with your surgeon if it does not resolve within a few months.

Cost and insurance coverage

Medicare covers cataract surgery when it is medically necessary — meaning your vision loss is affecting your daily life and cannot be corrected with glasses. Coverage includes the surgeon's fee, facility costs, and a basic IOL. If you choose a premium IOL that corrects astigmatism or provides multifocal vision, you will pay the difference out of pocket; this varies widely depending on the lens type and your surgeon's fees.

Private insurance plans typically cover cataract surgery the same way Medicare does. Call your insurance company before your surgery to confirm your coverage, your out-of-pocket costs, and whether your surgeon is in-network. Ask your surgeon's office for an estimate of what you will owe.

If cost is a concern, talk to your surgeon about basic IOL options. A standard single-vision IOL works well for most people and is usually fully covered. You can always choose a more advanced lens for the second eye if you are satisfied with the first surgery.

Frequently Asked Questions

Can both eyes be operated on the same day?

No. Surgeons operate on one eye at a time, usually spacing them one to two weeks apart. This allows the first eye to heal and gives you a chance to see how well the new lens works before the second surgery. If something unexpected happens with the first eye, the second eye remains unchanged.

Will I need glasses after cataract surgery?

It depends on the IOL you chose and your eye's natural focusing ability. Some people see clearly at distance without glasses but need reading glasses. Others need glasses for distance. Your surgeon will discuss your options before surgery so you understand what to expect.

How long does the artificial lens last?

The IOL is designed to last your lifetime. It does not wear out or need to be replaced. If your vision changes years later, it is usually because of other age-related eye changes, not the lens itself.

What if I have other eye problems like glaucoma or macular degeneration?

Cataract surgery can still help you see better, but it will not treat these other conditions. Your surgeon will discuss how your other eye problems may affect your results and what additional treatment you might need.

When can I drive again?

Most people can drive once their vision is clear enough and their surgeon says it is safe — usually one to two weeks after surgery. Your state's vision requirements for driving explore, so ask your surgeon when your vision will meet that standard. Do not drive until you have your surgeon's approval.