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Secondary Glaucoma: Types, Causes, and What to Expect
Glaucoma Caused by New Blood Vessels
One of the more serious forms of secondary glaucoma involves the growth of abnormal new blood vessels inside the eye. This type can cause pressure to rise quickly and is often more difficult to control than other forms.
When the retina does not receive enough blood supply, it releases chemical signals that trigger abnormal vessel growth in the wrong locations. These fragile new vessels spread over the iris and the drainage mesh, bringing scar tissue that obstructs fluid outflow. The two most common causes are diabetic eye disease and a central retinal vein occlusion, which is a blockage in the main vein draining the retina. Pressure can rise rapidly in this form and may not respond well to eye drops alone.
A central retinal vein occlusion cuts off normal blood flow through the retina, creating a strong signal for abnormal vessel growth toward the front of the eye. This shift can unfold over weeks to months following the initial vein event. Frequent follow-up exams during this window allow the eye doctor to detect new vessels early, before they fully seal off the drainage angle.
Anti-VEGF injections, which are medications that block the chemical signal driving vessel growth, can shrink the abnormal vessels and sometimes eliminate them. Laser treatment applied to the retina reduces the underlying signal at its source by lowering the retina's demand for blood flow. When pressure remains elevated despite these steps, a tube shunt device may be used to create a new pathway for fluid to leave the eye. Most cases require a combination of these approaches.
Glaucoma from Eye Inflammation
Inflammation inside the eye is a well-known trigger for secondary glaucoma. Managing both the inflammation and the resulting pressure rise requires careful coordination and ongoing monitoring.
Uveitis is inflammation affecting the middle layers of the eye. When it is persistent or recurrent, it can clog the drainage mesh with inflammatory cells and protein. Scar bands called synechiae can form between the iris and the lens, blocking fluid from moving into the front chamber of the eye. This creates a second layer of blockage on top of the drainage mesh problem, making pressure control more complex.
Steroid eye drops are a standard treatment for controlling eye inflammation. However, steroids can also raise eye pressure on their own. This creates a difficult balance: the inflammation requires the steroid, but the steroid can worsen the very pressure problem it is indirectly helping to cause. Careful dose adjustments, pressure checks at every visit, and switching to steroid-sparing medications when appropriate help manage both issues together.
Glaucoma surgery in an eye with a history of uveitis carries a higher risk of post-operative scarring, which can close off a new drainage pathway over time. Tube shunt devices tend to hold up better in these eyes than traditional drainage flap procedures. Controlling inflammation as much as possible before and after surgery significantly improves long-term outcomes.
Steroid-Induced and Medication-Related Glaucoma
Certain medications, especially steroids, can raise eye pressure as a side effect. Understanding who is most at risk and how to monitor for this helps prevent lasting damage to the optic nerve.
Steroid use in any form can increase pressure inside the eye. This includes eye drops, oral pills, inhaled steroids, skin creams, and injections given around or inside the eye. In susceptible individuals, pressure may begin to rise after just a few weeks of steroid use. The pressure often normalizes once the steroid is stopped, but prolonged use without monitoring can cause permanent damage to the drainage system.
People with a personal or family history of primary open-angle glaucoma are more likely to experience a significant steroid-related pressure response. Anyone using steroid eye drops should have their pressure checked within the first few weeks of starting the medication. Patients who require long-term systemic steroids for conditions such as autoimmune disease or asthma benefit from regular comprehensive eye exams that include pressure monitoring.
When steroids cannot be stopped entirely, switching to a formulation with a lower risk of raising pressure is often the first adjustment. Pressure-lowering eye drops can be added to offset the steroid effect. In cases where both the inflammation and the pressure remain difficult to control, a surgical procedure to create a new fluid drainage pathway may be recommended. The goal is always to find the safest balance between controlling inflammation and protecting the optic nerve.
Trauma, Pigment, and Lens-Related Types
Several other well-defined causes of secondary glaucoma involve physical changes to the eye's internal structures. Each has its own pattern of onset, risk factors, and treatment approach.
A significant blow to the eye can tear the tissue at the drainage angle, a condition called angle recession. This damage may not cause pressure problems immediately. In some cases, elevated pressure develops months or even years after the original injury as scar tissue slowly impairs fluid outflow. Penetrating eye injuries add further risks such as inflammation, lens displacement, and direct scarring of the drainage system. Regular eye exams that include drainage angle evaluation are important for anyone with a history of serious eye trauma.
In this type, tiny grains of pigment shed from the back surface of the iris and accumulate in the drainage mesh, gradually impairing fluid outflow. Pigmentary glaucoma appears most often in younger, nearsighted adults. Pressure spikes can occur after vigorous exercise or when the pupil dilates in low light. Examination of the drainage angle with a special lens, a test called gonioscopy, reveals a dense band of pigment that helps confirm the diagnosis.
This form involves a flaky, white protein material that builds up on the surface of the lens, the iris, and the drainage mesh. The deposits physically obstruct fluid outflow and tend to cause higher pressures than typical primary open-angle glaucoma. This type often progresses more quickly and may respond less predictably to pressure-lowering drops. The protein deposits also weaken the fibers that hold the lens in place, which can increase the complexity of cataract surgery if and when it becomes necessary.
An enlarged cataract can push the iris forward and press against the drainage angle, physically blocking fluid outflow in a condition called phacomorphic glaucoma. In another type called phacolytic glaucoma, a very advanced cataract leaks proteins into the eye that trigger inflammation and clog the drainage mesh. Both forms are treated by removing the problem lens. Taking out the lens resolves the pressure issue and opens the drainage pathway at the same time.
How Secondary Glaucoma Is Diagnosed and Monitored
Accurate diagnosis is essential because secondary glaucoma can look similar to primary glaucoma on basic testing. Identifying what is blocking the drain guides every treatment decision and helps the care team track whether treatment is working over time.
Gonioscopy is an in-office test that uses a specially designed contact lens to give the eye doctor a direct view of the drainage angle. It is the most important diagnostic tool for distinguishing secondary glaucoma from primary glaucoma. This exam reveals what is physically obstructing drainage, whether that is new blood vessels, pigment deposits, scar tissue, angle tears, or flaky protein material. Without gonioscopy, the true cause of elevated pressure can easily be missed and treated incorrectly.
OCT scans, which use light waves to produce detailed cross-sections of the optic nerve, show the current health of the nerve fiber layer. Visual field tests map areas of side vision that may have been lost to glaucoma damage. Tracking both over time gives the care team clear evidence of whether the treatment plan is stabilizing the disease. A stable scan and stable visual field mean pressure is adequately controlled. Worsening results signal the need for a change in the approach.
Secondary glaucoma often requires collaboration between multiple care providers. The eye doctor manages the pressure and the drain directly, while a retina specialist, primary care physician, or rheumatologist may need to address the underlying condition. Good communication across the care team ensures that medications adjusted for one problem do not worsen another. At our practice, we offer laser treatment options including Selective Laser Trabeculoplasty (SLT), YAG Laser Peripheral Iridotomy, and Minimally Invasive Glaucoma Surgery including goniotomy, alongside medical management and close monitoring. More complex cases that require advanced surgical intervention are referred to trusted specialists.
Frequently Asked Questions
The following answers address common points of uncertainty about secondary glaucoma that may not be fully covered elsewhere on this page.
Pressure normalizing after stopping a steroid is a good sign, but it does not mean the drainage system is completely unaffected. Prolonged periods of elevated pressure can cause cumulative stress on the optic nerve even if the number itself corrects. Your eye doctor will want to verify that there is no residual nerve or visual field change before reducing the frequency of monitoring visits.
Anyone with a history of significant blunt or penetrating eye trauma should have annual comprehensive eye exams that specifically include gonioscopy and pressure measurement. Because angle recession can take years to cause pressure problems, the absence of symptoms does not mean the risk has passed. Establishing a baseline exam and tracking it over time is the most reliable way to catch any changes before damage accumulates.
It depends on the cause. Conditions such as uveitis or pseudoexfoliation can affect both eyes, sometimes at different rates or severity levels. Traumatic or lens-related glaucoma, by contrast, typically affects only the eye that sustained the injury or developed the cataract-related problem. Your eye doctor will examine both eyes thoroughly regardless of which one brought you in, since the underlying condition may not be limited to one side.
Some are, and some are specific to the cause. Selective Laser Trabeculoplasty can be appropriate in certain secondary forms where the drainage mesh is the primary site of obstruction. YAG Laser Peripheral Iridotomy is used when the drainage angle is being blocked by a forward shift of the iris. The right laser procedure depends on where the obstruction is located and what is causing it, which is why gonioscopy is performed before recommending any laser treatment.
The optic nerve in secondary glaucoma is often under added strain from the root condition, whether that involves poor blood supply, ongoing inflammation, or direct structural damage. A lower target pressure creates a wider safety margin for a nerve that may already be more vulnerable than average. The specific target your eye doctor recommends will be based on your current nerve health, how much damage has already occurred, and how active the underlying condition remains.
Not always, but coordination with other providers is often beneficial. If your secondary glaucoma is linked to diabetes, an autoimmune condition, or long-term steroid use for a systemic disease, the provider managing that condition plays an important role in the overall plan. When the glaucoma itself requires surgical intervention beyond what is offered at your current practice, a referral to a glaucoma subspecialist may be recommended. Your eye doctor can help guide those decisions.
Schedule a Comprehensive Glaucoma Evaluation
Secondary glaucoma requires an approach that goes beyond simply lowering a number on a pressure reading. At NewView Eye Center, our team in Northern Virginia is equipped with the diagnostic tools and laser treatment options needed to evaluate the full picture, identify what is driving your pressure, and work with you on a plan that protects your vision for the long term. We welcome new patients and are glad to provide thorough, personalized care from the very first visit.
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