What Is Secondary Glaucoma
Secondary glaucoma is a group of eye conditions where pressure inside the eye rises because of another known cause. This increased pressure can damage the optic nerve, which is the bundle of nerve fibers that carries visual signals from your eye to your brain. When the optic nerve is harmed, vision loss can follow.
The word 'secondary' means this type of glaucoma happens as a result of something else. That something else could be another eye disease, an injury, a medication, or a health condition elsewhere in the body. This makes secondary glaucoma different from primary glaucoma, where doctors cannot point to one clear reason for the rise in eye pressure.
Your eye constantly makes a clear fluid called aqueous humor. This fluid flows through the pupil and drains out through a tiny mesh-like channel near the front of the eye. When the fluid drains at the same rate it is made, eye pressure stays in a healthy range.
In secondary glaucoma, something blocks or slows this drainage. The fluid builds up, and pressure inside the eye climbs. Over time, that extra pressure pushes against the optic nerve and can cause lasting harm to your sight.
Primary open-angle glaucoma, the most common form, develops slowly and has no single identifiable trigger. Secondary glaucoma, on the other hand, has a specific cause that a doctor can identify. Because the cause is known, treatment often focuses on addressing that root problem along with lowering eye pressure.
More than 3 million Americans have glaucoma, but only half are aware of their condition (Glaucoma Research Foundation, 2023). Many of these cases include secondary forms that could be managed more effectively with early detection and treatment of the underlying cause.
Anyone can develop secondary glaucoma, but certain groups face a greater chance. People who take steroid medications for long periods, those with diabetes, and individuals who have experienced an eye injury are more likely to develop this condition. People with a history of eye inflammation or certain blood vessel disorders in the eye also carry added risk.
Age plays a role as well. Adults in their fifties and beyond are more likely to experience many of the conditions that lead to secondary glaucoma. However, younger adults and even children can develop it after trauma or inflammation.
Types of Secondary Glaucoma Best Suited for Specialized Care
Neovascular glaucoma happens when new, abnormal blood vessels grow over the drainage area of the eye. These fragile vessels block the natural outflow of fluid, causing eye pressure to rise. This type is most often linked to diabetic retinopathy, a complication of diabetes that damages blood vessels in the retina. It can also develop after a retinal vein occlusion, which is a blockage in the blood vessels that carry blood away from the retina.
Neovascular glaucoma tends to progress quickly and can be difficult to manage. Treating the underlying blood vessel problem is a key part of care. Doctors may use laser therapy or injections to stop the growth of abnormal vessels while also working to bring eye pressure down.
Certain medications called corticosteroids can raise eye pressure when used for an extended time. Corticosteroids are drugs that reduce swelling and calm the immune system. They come in many forms, including eye drops, pills, inhalers, creams, and injections. Even steroid eye drops prescribed after routine eye surgery can trigger a pressure increase in some people.
Not everyone who uses steroids will develop this problem. Some people are more sensitive to the pressure-raising effects of these medications. When steroid-induced glaucoma is caught early, stopping or changing the medication may allow eye pressure to return to a healthy level. In other cases, additional treatment is needed to protect the optic nerve.
Pigmentary glaucoma occurs when tiny granules of pigment, the colored material that gives your iris its hue, break loose and float into the drainage channels of the eye. Over time, these granules clog the drainage mesh and slow the outflow of fluid. The result is a gradual rise in eye pressure.
This type is more common in younger adults, particularly men who are nearsighted. Physical activity such as jogging or basketball can sometimes shake loose more pigment granules, leading to temporary spikes in eye pressure. Regular eye exams help catch pigmentary changes before significant nerve damage occurs.
Pseudoexfoliative glaucoma develops when a flaky, dandruff-like material builds up on the lens and other structures inside the eye. This material is called pseudoexfoliation, and it can wash into the drainage system and block fluid outflow. The condition tends to affect adults in their sixties and beyond and is one of the more common causes of secondary glaucoma worldwide.
Eyes with pseudoexfoliation syndrome may also have weaker support structures holding the lens in place. This can make future cataract surgery more complex. Early identification of pseudoexfoliative material during a routine eye exam allows doctors to monitor eye pressure closely and step in with treatment when needed.
An injury to the eye can damage the drainage structures and lead to elevated eye pressure. This is known as traumatic glaucoma. It can appear soon after the injury or develop months to years later. Blunt force injuries, such as being struck by a ball or a fist, are a common cause. Penetrating injuries that pierce the eye wall can also trigger this condition.
Because traumatic glaucoma can show up long after the original injury, anyone who has had a significant eye injury should have regular eye pressure checks for the rest of their life. Early monitoring gives doctors the chance to act before vision loss begins.
Uveitis is inflammation inside the eye. When this inflammation is severe or keeps coming back, it can damage the drainage pathways and raise eye pressure. Swelling and debris from the inflammation can physically block the outflow channels. In some cases, scar tissue forms that narrows or closes the drainage angle over time.
Treating uveitic glaucoma requires a careful balance. Doctors must calm the inflammation, which often calls for steroid medications, while also managing the eye pressure that steroids themselves may worsen. Close follow-up and a tailored treatment plan are important for preserving vision in these cases.
Signs and Symptoms to Watch For
In many cases, secondary glaucoma develops without obvious symptoms at first. The rise in eye pressure may be gradual, and people often do not feel the change. By the time a person notices vision problems, some damage to the optic nerve may have already taken place.
Some early clues may include:
- Mild headaches or brow aches, especially on one side
- Blurred vision that comes and goes
- Seeing halos or colored rings around lights at night
- A feeling of pressure or fullness in one eye
- Gradual loss of side vision, also called peripheral vision
Some forms of secondary glaucoma can cause a sudden and sharp rise in eye pressure. This is considered a medical situation that needs same-day care. Symptoms of a rapid pressure spike include:
- Severe eye pain that may spread to the forehead
- Sudden blurry or foggy vision
- Nausea or vomiting along with eye pain
- Redness in the white part of the eye
- Seeing bright halos around every light source
If you experience any of these symptoms, contact your eye doctor or visit an emergency room right away. Quick treatment can help prevent lasting damage to your optic nerve and your vision.
The symptoms a person experiences depend on which type of secondary glaucoma they have and how quickly eye pressure rises. Steroid-induced glaucoma, for example, often develops slowly and quietly. Neovascular glaucoma, by contrast, can cause rapid pain and vision changes. Traumatic glaucoma may not show symptoms for months or years after the original injury.
This wide range of possible symptoms is one reason why routine eye exams matter so much. An eye care professional can measure your eye pressure and examine your optic nerve even when you feel fine, catching problems before they cause noticeable harm.
Because secondary glaucoma is linked to other conditions and medications, sharing your complete health history with your eye doctor is very helpful. Be sure to mention any steroid medications you use, past eye injuries, diabetes, or episodes of eye redness and inflammation. This information helps your doctor look for the right signs and run the right tests.
How Secondary Glaucoma Is Diagnosed
Diagnosing secondary glaucoma begins with a thorough eye exam. Your eye doctor will check your visual sharpness, measure the pressure inside each eye, and examine the front and back of the eye using a special microscope called a slit lamp. The slit lamp lets the doctor see the drainage angle, the lens surface, and the interior structures in fine detail.
During this exam, the doctor looks for clues that point to a secondary cause. These clues might include pigment deposits on the drainage mesh, flaky pseudoexfoliative material on the lens, abnormal blood vessels on the iris, or signs of past inflammation or injury.
Tonometry is the test used to measure eye pressure. A small instrument gently touches the surface of your eye or uses a quick puff of air to take the reading. Normal eye pressure falls within a certain range, but what counts as 'too high' can vary from person to person. Some optic nerves are more sensitive to pressure than others.
Your doctor may ask you to come in for pressure checks at different times of the day because eye pressure can change throughout the day. Tracking these patterns helps build a clearer picture of how your eyes are doing.
Gonioscopy is a test that allows the doctor to see the drainage angle of the eye directly. The doctor places a special lens on the surface of your eye and uses a light to view the angle where fluid leaves the eye. This test is very important in secondary glaucoma because it can reveal specific blockages, scarring, abnormal blood vessels, or pigment buildup that point to the underlying cause.
To understand how much the optic nerve has been affected, doctors use imaging technology that takes detailed pictures of the nerve. These images show the shape and thickness of the nerve fibers and can detect damage before you notice any change in your vision.
Visual field testing checks your side vision and maps out any blind spots. During the test, you look at a central point and press a button each time you see a small flash of light in your peripheral vision. The results create a map of your visual field that the doctor uses to track changes over time.
Because secondary glaucoma is tied to another condition, your doctor may order extra tests. These could include:
- Blood sugar testing or a referral to your primary care doctor if diabetes is suspected
- Retinal imaging to look for blood vessel problems linked to neovascular glaucoma
- Blood work to check for inflammatory conditions that could cause uveitis
- A review of all your current medications, especially steroids
Identifying and addressing the root cause is just as important as lowering eye pressure. A complete diagnostic workup helps your care team build the most effective treatment plan.
Treatment Options at Washington Eye Institute
The most important step in managing secondary glaucoma is addressing the condition that caused it. If steroid medication is raising your eye pressure, your doctor may switch you to a different drug or lower your dose. If diabetes-related blood vessel growth is the trigger, treatments aimed at the retina may be needed before or alongside glaucoma therapy. If inflammation is the source, calming that inflammation becomes a top priority.
In some cases, treating the root cause is enough to bring eye pressure back to a safe level. In other situations, the drainage system has been damaged enough that additional glaucoma-specific treatments are needed.
Eye drops are often the first line of treatment for lowering eye pressure. Several types of drops work in different ways. Some reduce the amount of fluid your eye produces. Others help fluid drain more efficiently. Your doctor may prescribe one type or a combination, depending on your pressure level and the specific type of secondary glaucoma you have.
Using eye drops correctly and consistently is important for them to work well. Your doctor or care team at Washington Eye Institute will show you the proper technique and discuss a schedule that fits your daily routine.
Laser procedures can help lower eye pressure when drops alone are not enough. The type of laser treatment depends on the cause of the glaucoma. For example, laser trabeculoplasty uses a focused beam of light to open the drainage channels. In neovascular glaucoma, a different laser may be used to reduce abnormal blood vessel growth on the retina.
Laser treatments are performed in the office and typically take only a few minutes per eye. Most people experience little discomfort. The effects of some laser treatments may fade over time, so follow-up visits are important to monitor the results.
When medications and laser treatments do not control eye pressure well enough, surgery may be recommended. Several surgical options are available:
- Trabeculectomy creates a small new drainage pathway in the eye to allow fluid to flow out and lower pressure
- Tube shunt surgery places a tiny tube in the eye to redirect fluid to a small reservoir on the outside of the eye
- Minimally invasive glaucoma surgery, often called MIGS, uses very small devices or techniques to improve drainage with less disruption to the eye
The best surgical choice depends on the type and severity of your secondary glaucoma, the health of your eye, and your overall medical history. Your surgeon at Washington Eye Institute will discuss the options and help you understand what to expect.
Secondary glaucoma can sometimes involve more than one challenge at the same time. A person might have both uveitis and a need for steroid medications that raise eye pressure. Someone with diabetes might need retinal treatment and glaucoma surgery in the same period. These overlapping situations require coordinated care.
Washington Eye Institute brings together specialists in glaucoma, retinal disease, and inflammation to work as a team. This collaborative approach helps ensure that treating one condition does not worsen another.
Secondary glaucoma often requires long-term follow-up. Even after successful treatment, eye pressure can change as the underlying condition evolves. Regular visits allow your doctor to catch any changes early and adjust your treatment plan. The goal is to maintain stable eye pressure and protect as much vision as possible for the long term.
Your Journey with Secondary Glaucoma Step by Step
During your first visit to Washington Eye Institute for secondary glaucoma, you can expect a detailed evaluation. The visit may take longer than a standard eye exam because the doctor needs to understand both your glaucoma and its underlying cause. Bring a list of all medications you take, including over-the-counter drugs, supplements, and any steroid medications in any form.
Your doctor will review your health history, perform a complete eye exam, measure your eye pressure, and may run additional imaging tests. There will also be time for you to ask questions and discuss any concerns you have about your diagnosis or treatment options.
After your initial evaluation, follow-up visits are scheduled based on the severity of your condition and the type of treatment you receive. Some patients return every few weeks at first, while others may be seen every few months once their pressure is stable. Each follow-up visit typically includes a pressure check and a brief examination to see how your treatment is working.
Over time, your doctor may adjust your medications, recommend additional procedures, or change your visit schedule. The plan evolves with you, and the goal is to find a routine that keeps your eye pressure well controlled with the fewest side effects.
While medical treatment is the foundation of glaucoma care, daily habits can play a supporting role. Eating a balanced diet rich in leafy greens, colorful fruits, and fish may support overall eye health. Staying physically active with moderate exercise like walking or swimming can help maintain healthy blood flow to the optic nerve.
If you have been diagnosed with pigmentary glaucoma, talk with your doctor about which types of exercise are safe for you. Some vigorous activities may cause temporary pressure spikes in certain individuals. Your care team can help you find an activity plan that keeps you healthy without adding unnecessary risk.
Many people with secondary glaucoma use daily eye drops to keep their pressure in check. Sticking to a consistent schedule makes these drops more effective. Setting a daily alarm, keeping your drops near something you use every day like a toothbrush, or using a medication tracking app can help you remember.
If your drops cause stinging, redness, or other side effects, let your doctor know rather than skipping doses. There may be an alternative medication that works just as well with fewer side effects.
If your secondary glaucoma was caused by an eye injury, protecting your eyes going forward is especially important. Wearing protective eyewear during sports, home repair projects, or yard work can help prevent a new injury that could make your glaucoma worse.
Between scheduled visits, reach out to your eye doctor if you notice any sudden changes. Contact your care team if you experience a sudden increase in eye pain, a noticeable drop in vision, new floaters or flashes of light, or redness that does not improve. Reporting changes promptly gives your doctor the best chance to adjust your treatment before any lasting harm occurs.
Questions and Answers About Secondary Glaucoma
The main difference is that secondary glaucoma has a clear, identifiable cause. Primary open-angle glaucoma develops without a single known trigger and tends to progress slowly over many years. Secondary glaucoma, however, results from something specific such as an injury, a medication, another eye disease, or a systemic health condition. Because the cause can be identified, treatment plans often include addressing that root problem in addition to lowering eye pressure.
Secondary glaucoma can affect one eye or both, depending on the cause. For example, if an injury happens to one eye, only that eye may develop traumatic glaucoma. But conditions like diabetes or long-term steroid use can affect both eyes at the same time. Pseudoexfoliative glaucoma may start in one eye but often eventually involves the other. Your doctor will check both eyes at every visit to monitor for any changes.
When the underlying cause is addressed early, eye pressure may return to a healthy range on its own in some cases. For instance, if steroid medication is the trigger and it is stopped or replaced, pressure may gradually come down. However, if the drainage system has been damaged over time, the pressure may remain elevated even after the original cause is resolved. In those situations, ongoing glaucoma treatment is needed to protect the optic nerve.
Vision that has been lost due to optic nerve damage from glaucoma cannot be brought back with current treatments. The optic nerve does not regenerate once its fibers are harmed. This is why early detection and consistent treatment are so important. The focus of treatment is to preserve the vision you have by keeping eye pressure at a safe level and managing the underlying condition.
The frequency of follow-up visits depends on several factors, including how well your eye pressure is controlled, the type of secondary glaucoma you have, and whether you have recently changed treatments. In the early stages or after starting a new medication, visits may be as frequent as every few weeks. Once your condition is stable, visits may be spaced to every three to six months. Your doctor at Washington Eye Institute will set a schedule that matches your specific needs.
While not every case of secondary glaucoma can be prevented, there are steps that may lower your risk. Managing diabetes well through diet, exercise, and medical care can reduce the chance of neovascular glaucoma. Wearing protective eyewear during sports and high-risk activities helps prevent traumatic glaucoma. If you take steroid medications, work with your doctor to use the lowest effective dose for the shortest time possible. Most importantly, attend regular comprehensive eye exams so that any early signs of elevated pressure or drainage problems can be caught and addressed before significant damage occurs.