Cataract Surgery in Glaucoma Patients
How Cataract Surgery Helps Glaucoma
Cataract surgery does more than clear up blurry vision. For many people with glaucoma, it also brings eye pressure down. Eyes with open-angle glaucoma, high eye pressure, and angle-closure glaucoma can all benefit. The drop is largest in eyes that start with high pressure. One study found a mean drop of 8.5 mmHg in eyes with the highest starting pressure (PMC, 2020). This benefit can last for years. It is one reason your doctor may suggest cataract surgery earlier if you also have glaucoma.
The natural lens sits behind the iris. As a cataract grows, the lens gets thicker. It pushes the iris forward and blocks the drain inside the eye. Fluid builds up and pressure rises. The surgeon takes out the thick lens and puts in a thin one. The drain opens, and fluid flows out more freely. Pressure goes down. This is why angle-closure glaucoma patients gain the most from the procedure.
Even though pressure goes down long term, it can spike right after the operation. Glaucoma patients are more likely to have a pressure rise 3 and 7 hours after surgery than people without glaucoma (PMC, 2020). The care team checks pressure in the hours after the procedure. Eye drops can bring a spike down fast. Knowing about this risk helps patients feel ready.
Adding a Glaucoma Step to Cataract Surgery
MIGS stands for minimally invasive glaucoma surgery. It can be done at the same time as cataract removal. MIGS places a tiny device or opens a small path inside the eye to help fluid drain. It works well for mild to moderate open-angle glaucoma (AAO, 2024). The surgery stays short. Healing is fast. The risk of problems is low. The device goes through the same cut used for the cataract, so no extra wound is needed.
Studies looked at how much of the pressure drop comes from the cataract step and how much from the MIGS step. About two-thirds of the pressure and drug drop is tied to the cataract removal, while about one-third comes from the MIGS device (AAO EyeWiki, 2024). If pressure stays low after the combined surgery, some patients can cut back on or even stop their daily glaucoma drops (AAO, 2024).
Clearer sight plus lower pressure can change daily life for the better. At two years, more patients who had combined MIGS and cataract surgery said their quality of life improved than those who had cataract surgery alone (AAO EyeNet, 2024). Fewer drops mean less sting, less dry eye from preservatives, and a simpler daily routine. Many patients value these day-to-day gains as much as the numbers on the chart. Less time spent on drops also means fewer trips to the pharmacy.
Healing and Follow-Up
Most people see more clearly within a few days. Some redness, mild ache, and light sensitivity are normal early on. The surgeon will give you drops to fight infection and swelling. You may still need your glaucoma drops during this time. Do not rub the eye. Avoid heavy lifting and swimming until the doctor says it is safe. Rest as much as you can on the first day. Wear the eye shield at night to keep from pressing on the eye while you sleep.
You will have a visit within a day or two of surgery, then at one week, one month, and three months. The doctor checks pressure at each visit to see how the eye is doing. If pressure stays low and steady, glaucoma drugs may be cut back one at a time. Do not stop or change drops on your own. Each step down must follow a pressure reading. Bring your drop bottles to every visit so the care team can track what you are using.
Call the office if you notice a sudden loss of sight, sharp eye pain, a big jump in floaters, or flashing lights. These signs could mean a problem that needs fast care. Mild shifts in vision and a gritty feeling are normal in the first weeks. If you are not sure, call and ask. It is safer than waiting.
Risks to Know About
A short pressure spike is the main extra risk for glaucoma patients. The care team has a plan to spot and treat it within hours. Drops given before the operation can lower the chance of a spike. If one does happen, it is usually fixed the same day with more drops or a quick office step. You will not need to go back to the operating room for this.
All eye surgery carries a small risk of infection and swelling. Glaucoma patients who have used drops for a long time may have a drier eye surface. This can slow surface healing and make the eye feel gritty for a while. Using the drops as told, adding lubricant drops, and going to every follow-up visit are the best ways to handle this. Tell your doctor if dry eye symptoms bother you. There are extra steps that can help.
When glaucoma is far along, the optic nerve has less room to handle stress. The surgeon weighs the gain of better sight against the small chance that a pressure swing could strain the nerve. In these cases, a two-step plan or a more involved glaucoma procedure may be a better fit than a combined approach. The surgeon will discuss the options with you and explain the trade-offs for each path.
Questions About Cataract Surgery With Glaucoma
Cataract surgery can lower pressure, which helps guard the optic nerve. But it does not treat glaucoma on its own. You will still need check-ups, and many patients still need drops or other care. Think of the pressure drop as a bonus, not a full fix. Glaucoma must be watched for the rest of your life, even after surgery goes well.
Yes, but the plan may look different. The surgeon may use a stronger glaucoma procedure or schedule it as a second step. The choice depends on how much pressure needs to come down and how stable the nerve is. The care team will map out the best path with you and explain the timeline for each stage.
In many cases, the lower pressure holds for years. The exact time depends on the type of glaucoma, the starting pressure, and whether a device was placed. Follow-up visits track the trend. If pressure starts to creep back up, the doctor can restart or adjust drugs before any harm occurs.
Some patients stop their drops after a combined procedure. Others need fewer drops than before. A smaller group still needs the same amount. The result depends on how severe the glaucoma is and how much the surgery lowers pressure. The doctor will check at each visit and adjust one step at a time. Do not make changes on your own without a pressure check first.
Healing is much the same as with standard cataract surgery. Most MIGS steps add only a few minutes to the operation. No extra cuts are needed. Drop schedules and activity limits match. Some patients see mild blur for a few days if a gel or device sits inside the eye, but it clears fast.
The added risk is small. The main concern is a short pressure spike, and the team has tools to manage it. Good planning, teamwork between your cataract and glaucoma doctors, and keeping all follow-up visits help keep the risk low. Most glaucoma patients do very well with cataract surgery.
Book Your Eye Exam
If you have both cataracts and glaucoma, call our office to set up a full eye exam. Your care team will review your pressure, nerve scans, and vision goals to decide whether a combined approach is right for you. They will walk you through each step of the process and answer any questions you have along the way.