Cataract Surgery: What Happens During the Procedure

Understanding what happens during cataract surgery can help ease your mind and prepare you for a smooth, comfortable experience. Cataract surgery is one of the most commonly performed procedures in the world, with a well-established safety record and consistently positive outcomes. At Greenwich Ophthalmology Associates, our fellowship-trained cataract surgeons in the greater NY/CT region guide each patient through every stage of the process with precision and care. This page walks you through the procedure from start to finish so you know exactly what to expect on the day of surgery.

Cataract surgery follows a carefully planned sequence of steps, each designed to safely remove the clouded natural lens and replace it with a clear artificial lens called an intraocular lens (IOL). The entire process is performed on an outpatient basis, meaning you go home the same day.

When you arrive at the surgical center, our team will check you in and confirm your medical history and medications. You will receive dilating eye drops to widen your pupil, giving your surgeon a clear view of the lens behind the iris. An intravenous (IV) line may be placed to deliver mild sedation, helping you feel calm and relaxed before entering the operating room.

Our cataract surgeons use topical anesthetic eye drops to numb the surface of your eye completely. In most cases, this is all that is needed to keep you comfortable throughout the procedure. Some patients may receive an additional local anesthetic injection near the eye for more thorough numbing, though this is less common with modern techniques.

Your surgeon creates a tiny incision, typically 2 to 3 millimeters wide, at the edge of the cornea (the clear front surface of the eye). This micro-incision is small enough that it usually seals on its own without stitches. Through this opening, your surgeon gains access to the lens capsule where the cataract sits.

A precise circular opening called a capsulorhexis is made in the thin membrane (lens capsule) that surrounds your natural lens. This step requires a steady hand and careful technique, as the capsule must remain intact to hold the new IOL securely in place. The opening is typically about 5 millimeters in diameter and is created using either fine surgical instruments or a femtosecond laser.

The cataract is broken into tiny fragments using a technique called phacoemulsification. A small ultrasonic probe is inserted through the incision, where it emits high-frequency sound waves that gently break apart the hardened, cloudy lens material. The same probe simultaneously suctions out the fragments, leaving the clear lens capsule behind like an empty pocket ready to receive the new lens.

Once the natural lens material has been completely removed, your surgeon folds the new IOL and inserts it through the same small incision using a specialized injector. The lens unfolds inside the capsular bag and is positioned carefully to align with your eye's visual axis. The type of IOL you receive depends on your vision goals and the recommendation of your surgeon, and you can explore the available choices in our guide to cataract lens options.

After the IOL is securely in place, your surgeon verifies that the incision is properly sealed. In most cases, the micro-incision self-seals without the need for sutures, though a single stitch may be placed if necessary. A protective shield is placed over your eye, and you are moved to a recovery area to rest briefly before going home.

Modern cataract surgery relies on advanced technology to deliver precise, predictable results. Our cataract surgeons use a combination of sophisticated instruments and imaging systems tailored to each patient's needs.

Phacoemulsification has been the gold standard technique for cataract removal for decades. Today's systems are faster, gentler, and more energy-efficient than earlier versions, which helps protect delicate structures within the eye. Advanced fluidics management within the phacoemulsification handpiece keeps the eye stable throughout the procedure, allowing for a controlled and efficient removal process.

Some patients opt for laser-assisted cataract surgery, which uses a femtosecond laser to perform several key steps with computer-guided precision. The laser can create the corneal incision, perform the capsulorhexis, and pre-soften the cataract before the surgeon completes the removal. This option may be particularly beneficial for patients who need precise corneal incisions for astigmatism correction during surgery.

Advanced real-time measurement tools, including intraoperative aberrometry systems such as ORA, allow your surgeon to verify or fine-tune the IOL power selection during the procedure. These measurements are taken after the cataract has been removed, giving a more accurate reading of the eye's optical needs. Digital microscope systems also provide your surgeon with a magnified, high-definition view of the surgical field throughout every step.