Cataract surgery removes the cloudy natural lens from your eye and replaces it with a clear artificial one. The entire procedure takes 10 to 20 minutes, is done while you’re awake, and you go home the same day. It’s one of the most commonly performed surgeries in the world, and here’s exactly what happens before, during, and after.
What Happens Before Surgery
A week or two before your procedure, your eye doctor takes precise measurements of your eye. These include the length of the eyeball, the curvature of the cornea, the depth of the front chamber, and the thickness of your natural lens. These numbers feed into a formula that determines the power of the artificial lens you’ll receive, essentially customizing it to your eye so you get the sharpest possible vision afterward.
You’ll also discuss which type of replacement lens you want (more on that below) and review your medications. Some blood thinners or prostate medications can affect the surgery, so your surgeon needs a full picture.
How the Eye Is Numbed
You won’t feel pain during the procedure. Most surgeons numb the eye using one of two approaches: anesthetic eye drops applied to the surface, or a small injection of numbing medication around the eye. Drops are simpler and wear off faster, but some patients notice they can still sense light and slight pressure during the operation. An injection provides deeper numbness and keeps the eye still, though patients tend to dislike the brief sting of receiving it. Many surgeons also place a small amount of numbing solution inside the eye once the procedure begins for additional comfort.
You’ll typically receive a mild sedative through an IV to help you relax, but you stay conscious the whole time.
The Step-by-Step Procedure
The most common technique is called phacoemulsification. Here’s what happens in sequence:
- The incision. Your surgeon makes a tiny cut in the cornea, usually between 1.8 and 2.2 millimeters wide. That’s smaller than the width of a pencil eraser. This incision is self-sealing, meaning it closes on its own without stitches in most cases.
- Opening the lens capsule. Your natural lens sits inside a thin, transparent bag called the capsule. The surgeon creates a small circular opening in the front of this capsule to access the cloudy lens inside.
- Breaking up the cataract. A needle-thin probe is inserted through the incision and into the lens. The tip of this probe vibrates back and forth at ultrasonic speed, breaking the hardened, cloudy lens into tiny fragments. Think of it like a tiny jackhammer dissolving the cataract from the inside.
- Suctioning out the pieces. The same probe simultaneously suctions out the broken fragments, clearing the capsule so it’s ready for the new lens.
- Inserting the artificial lens. The replacement lens is folded and slid through the small incision. Once inside the eye, it unfolds and is positioned within the now-empty capsule, where it stays permanently.
The incision is so small that it typically seals without sutures. Your surgeon may hydrate the edges of the wound with a small amount of fluid to ensure a tight closure.
Laser-Assisted Cataract Surgery
Some surgeons offer a laser-assisted version where a high-precision laser handles several of the steps that are otherwise done by hand. The laser can create the corneal incision, open the lens capsule, and pre-fragment the cataract before the ultrasound probe finishes the job. This approach offers greater precision and repeatability, particularly for the capsule opening and for managing astigmatism through carefully shaped incisions.
The laser version uses real-time imaging to map your eye during the procedure, guiding each cut with extreme accuracy. However, the core of the surgery is the same: the cataract is still broken up and removed, and an artificial lens is placed inside. Laser-assisted surgery typically costs more out of pocket because insurance often covers only the standard technique.
Choosing Your Replacement Lens
The artificial lens you receive is permanent and doesn’t need to be replaced. There are several types, and the right choice depends on your eyes, your lifestyle, and your budget.
- Monofocal lenses give you sharp vision at one distance, usually far away. Most people who choose these wear reading glasses afterward for close-up tasks like books or phones. These are covered by Medicare and most insurance plans.
- Multifocal lenses have built-in zones for near, intermediate, and distance vision, similar to bifocal glasses. They reduce dependence on glasses but can cause glare or halos around lights at night. They’re not recommended for people with glaucoma or macular degeneration, since they let less light into the eye.
- Extended depth-of-focus (EDOF) lenses stretch a single corrective zone to cover distance and intermediate vision (like computer screens). They produce fewer halos than multifocals but may still require reading glasses for fine print.
- Toric lenses have extra correction for astigmatism built in. If you have moderate to high astigmatism, a toric lens can reduce your need for glasses significantly. Toric versions are available in both monofocal and multifocal designs.
Multifocal and EDOF lenses are considered premium upgrades, so you’ll pay the difference out of pocket. If night driving is a big part of your routine, your surgeon may steer you toward a monofocal or toric lens to avoid glare-related side effects.
What Recovery Looks Like
You’ll wear a protective eye shield home and for sleeping during the first few nights. Most people notice improved vision within a day or two, though it can look hazy or slightly off at first. Full vision stabilization typically takes two to three weeks.
After surgery, you’ll use three types of eye drops for several weeks: one to prevent infection, one to reduce inflammation, and one to control swelling. The exact schedule varies by surgeon, but expect to use drops multiple times a day for about four to six weeks.
Activity Restrictions
The first 48 hours are the most restrictive. Don’t bend over or put your head below your waist during this window, because the change in pressure can interfere with healing. Be gentle when sneezing or coughing.
You can shower the next day, but keep the water stream away from your eye. Swimming is off-limits for two weeks to lower the risk of infection. Exercise like running, biking, golf, tennis, and sex should wait 7 to 10 days. Your surgeon will give you a specific timeline based on how your eye is healing at your follow-up visits.
Risks and Success Rates
Cataract surgery is one of the safest operations performed today. Serious complications are rare. In a study of over 45,000 patients, the rate of severe eye infection after surgery was roughly 0.03 per 100 procedures, and the rate of significant intraoperative complications like a tear in the lens capsule was under 0.5 per 100. The vast majority of patients see meaningful improvement in their vision.
The most common minor issues after surgery include temporary dryness, mild inflammation, and floaters. A small percentage of people develop a clouding of the lens capsule months or years later, sometimes called a “secondary cataract.” This is easily treated with a quick, painless laser procedure in the office.
If you need surgery on both eyes, they’re typically done a few days to a few weeks apart rather than at the same time, giving the first eye a head start on healing.