Glaucoma is treated by lowering the pressure inside your eye, and there are several ways to do it: medicated eye drops, laser procedures, surgical implants, and in some cases oral medications. The specific approach depends on the type and severity of your glaucoma, but the universal goal is reducing eye pressure enough to slow or stop damage to the optic nerve. For most people with open-angle glaucoma, doctors aim to bring pressure down 20% to 30% below its starting level.
The Goal: Lowering Eye Pressure
All glaucoma treatments work toward the same thing: reducing the fluid pressure inside the eye. Your eye constantly produces a clear fluid that nourishes its internal structures, and that fluid drains out through a tiny mesh-like channel. When drainage slows down or fluid builds up, pressure rises and gradually damages the optic nerve. The tricky part is that you typically can’t feel this pressure, and vision loss happens so slowly that most people don’t notice it until significant damage has occurred.
Your doctor will set a target pressure based on how advanced the disease is. Someone with mild glaucoma might aim for a pressure around 18 mmHg, while moderate cases often target 15 mmHg and severe cases may need to get down to 12 mmHg. These numbers aren’t rigid rules. Your doctor will adjust the target over time depending on whether the nerve damage is stable or still progressing.
Eye Drops: The Most Common Starting Point
Most people with glaucoma start treatment with prescription eye drops used once or twice daily. The two most common types work in different ways. Prostaglandin analogs increase the drainage of fluid out of the eye, while beta-blockers reduce the amount of fluid the eye produces in the first place. Prostaglandin drops are often tried first because they’re effective and only need to be used once a day, usually at bedtime.
The challenge with eye drops is that they only work if you actually use them consistently, and that turns out to be a major problem. Studies estimate that 30% to 80% of glaucoma patients don’t take their drops as prescribed. The reasons are varied: forgetfulness, difficulty squeezing drops into the eye (especially for people with arthritis or tremors), side effects like eye redness or irritation, cost, and the simple fact that glaucoma doesn’t cause symptoms in its early stages. It’s hard to stay motivated to use a daily medication when you feel perfectly fine.
When one type of drop isn’t enough, your doctor may add a second drop from a different class or switch to a combination drop that contains two medications in one bottle. Some people end up on two or three different drops, which makes the adherence problem even worse.
Laser Treatment
Selective laser trabeculoplasty, commonly called SLT, is a quick in-office procedure that uses targeted pulses of light to stimulate the eye’s natural drainage system. The procedure takes about five minutes, is done with numbing drops so you don’t feel pain, and you go home the same day. It effectively lowers eye pressure in about 80% of patients.
SLT is increasingly used as a first treatment rather than something reserved for when drops fail. It’s a good option for people who struggle with daily drops, whether because of physical limitations, side effects, or simply the burden of remembering. The effect does wear off after several years, but unlike some laser procedures, SLT can be repeated because it doesn’t cause permanent scarring to the drainage tissue.
Sustained-Release Implants
One of the newer options for managing glaucoma is a tiny implant placed inside the eye that slowly releases pressure-lowering medication over months. These implants were designed to last four to six months, but the effects often persist longer than expected. In clinical trials, 40% of patients didn’t need any additional pressure-lowering treatment for at least a year after receiving a single implant. After three consecutive implants spaced four months apart, there was an 80% chance patients wouldn’t need further treatment for at least another year beyond that.
These implants directly address the adherence problem. There’s nothing to remember, no drops to administer, and no daily routine to maintain. Your doctor places the implant during a brief office visit, and it does the work on its own until it’s time for a replacement.
Surgery for Advanced or Resistant Glaucoma
When drops, laser treatments, and implants aren’t enough to control pressure, surgery creates a new drainage pathway for fluid to leave the eye. The two main approaches are trabeculectomy and tube shunt implantation.
In a trabeculectomy, the surgeon creates a small opening at the junction where the white of the eye meets the clear cornea. Fluid flows through this opening into a pocket under the thin tissue covering the eye, where the body gradually absorbs it. This creates a small, slightly raised area called a bleb, usually hidden under the upper eyelid. The procedure is effective but carries a risk of the new drainage site leaking, especially early on, since fluid starts flowing immediately after surgery.
Tube shunt surgery involves placing a tiny silicone tube inside the eye that routes fluid to a small plate positioned further back on the eye’s surface. Because the drainage happens at a distance from the surgical site, the risk of early leakage is lower. Tube shunts have become increasingly common for cases where trabeculectomy has failed or where the eye has scarring from previous surgeries. Both procedures require careful follow-up in the weeks after surgery to make sure pressure settles into the right range.
Emergency Treatment for Acute Angle-Closure
Not all glaucoma develops slowly. Acute angle-closure glaucoma is a sudden spike in eye pressure that causes intense eye pain, headache, nausea, blurred vision, and halos around lights. This is a medical emergency, and treatment starts immediately with multiple medications given at once to bring the pressure down as fast as possible.
Once the pressure drops enough for the cornea to clear (sometimes within hours, sometimes over a day or two), the definitive treatment is a laser peripheral iridotomy. The doctor uses a laser to create a tiny hole in the iris, giving fluid an alternate route to reach the drainage system. The procedure is done at a specialized laser table with just numbing drops for comfort. Because there’s roughly an 80% chance the other eye will have the same type of attack, doctors typically treat both eyes.
If the cornea is too cloudy for the laser to work through, or the iris is too thick to penetrate, the same opening can be created surgically in an operating room.
Oral Medications
Oral pressure-lowering pills are occasionally used, most often during acute pressure spikes or as a short-term bridge while waiting for surgery. They work by reducing how much fluid the eye produces. These medications are effective but come with a long list of systemic side effects: fatigue, tingling in the hands and feet, a metallic taste, nausea, depression, and kidney stones among them. Because of this side effect profile, oral medications are rarely used as a long-term solution. They exist for situations where the pressure needs to come down quickly and topical treatments alone aren’t getting the job done.
Choosing the Right Approach
Glaucoma treatment isn’t one-size-fits-all, and it often evolves over time. Someone might start with a single eye drop, add SLT laser when the drop isn’t enough, and eventually need surgery years later if the disease progresses. Others might choose laser treatment from the start to avoid the daily hassle of drops. The decision depends on how high your pressure is, how much nerve damage has already occurred, your ability to manage daily medications, and your own preferences about convenience versus invasiveness.
What matters most is that the treatment actually keeps your eye pressure at its target consistently over time. A technically superior option you can’t stick with is less effective than a simpler one you can. If you’re struggling with drops, whether from side effects, cost, or the logistics of getting them into your eyes, that’s worth raising with your eye doctor. Alternatives exist, and switching to one that fits your life better can make the difference between stable vision and preventable loss.