Secondary Glaucoma: Types and Causes

Several distinct types of secondary glaucoma exist, each with a different mechanism for raising eye pressure. The following are the forms our glaucoma specialists encounter most often.

Neovascular glaucoma occurs when abnormal new blood vessels grow over the iris and into the drainage angle, physically blocking aqueous humor outflow. This form is frequently triggered by conditions that reduce blood supply to the retina, including proliferative diabetic retinopathy, central retinal vein occlusion, and ocular ischemic syndrome. Neovascular glaucoma often progresses rapidly and requires prompt treatment of both the underlying retinal disease and the elevated eye pressure.

Uveitis, or inflammation inside the eye, can lead to secondary glaucoma through several mechanisms. Inflammatory cells and protein debris can clog the trabecular meshwork, scar tissue called synechiae can seal the drainage angle shut, and swelling of surrounding tissues can further impede outflow. Chronic or recurrent uveitis carries a particularly high risk, making routine pressure monitoring essential for patients with ongoing inflammatory eye conditions.

Prolonged use of corticosteroid medications, whether in the form of eye drops, oral pills, nasal sprays, inhalers, or skin creams applied near the eyes, can cause intraocular pressure to rise. Steroids alter the microscopic structure of the trabecular meshwork, making it harder for fluid to drain. This form of secondary glaucoma is often reversible if the steroid is discontinued or replaced under medical supervision, though some patients may need ongoing pressure-lowering treatment.

A blunt or penetrating injury to the eye can damage the drainage angle and lead to elevated pressure either immediately or years after the original trauma. Angle recession, in which the tissue layers of the drainage angle are torn apart by impact, is one of the most common mechanisms. Because traumatic glaucoma can appear long after the initial injury, patients with a history of significant eye trauma benefit from lifelong periodic screening.

Changes to the eye's natural lens can trigger several forms of secondary glaucoma. A swollen, mature cataract (phacomorphic glaucoma) can push the iris forward and block the drainage angle. In other cases, lens protein leaking through the capsule of a hypermature cataract (phacolytic glaucoma) triggers an inflammatory response that clogs the meshwork. Removal of the problematic lens through cataract surgery often resolves the pressure elevation in these patients.

Pseudoexfoliation syndrome produces flaky protein deposits that accumulate in the drainage angle, while pigment dispersion syndrome releases pigment granules from the iris that similarly obstruct outflow. Both conditions gradually reduce the meshwork's ability to filter aqueous humor, leading to pressure elevation and optic nerve damage over time. These types tend to cause higher and more fluctuating pressures than primary open-angle glaucoma.

Primary glaucoma develops without an identifiable external trigger, while secondary glaucoma always results from another condition, injury, or medication. Treatment for secondary glaucoma focuses on addressing the underlying cause alongside lowering eye pressure. You can learn more about the different types of glaucoma and their risk factors to understand how they compare.

Yes. Certain types, such as neovascular glaucoma and acute uveitic glaucoma, can cause rapid pressure spikes that produce intense pain, redness, and vision changes within hours. Other types, including steroid-induced and exfoliative glaucoma, develop gradually over weeks or months and may go unnoticed without routine eye pressure checks.

While lifestyle changes alone cannot replace medical treatment, some habits can support overall eye health. Maintaining good control of systemic conditions like diabetes and hypertension reduces the risk of retinal complications that can lead to neovascular glaucoma. Staying physically active with moderate exercise, managing stress, and being mindful of caffeine intake may also play a supportive role when combined with your prescribed treatment plan.

Monitoring frequency depends on the specific risk factor and how stable your eye pressure remains. Patients on long-term steroid therapy may need pressure checks every few weeks initially, then every few months once stable. Those with a history of uveitis or eye trauma typically benefit from comprehensive evaluations at least every six to twelve months, though our glaucoma specialists may recommend more frequent visits based on your individual circumstances.

Treatment targets both the elevated pressure and the underlying cause. Pressure-lowering eye drops, oral medications, laser procedures such as selective laser trabeculoplasty, and surgical options including minimally invasive glaucoma surgery (MIGS) or traditional filtering surgeries may all be considered. Simultaneously, our team addresses the root condition, whether that means adjusting steroid medications, treating retinal disease with injections or laser, or managing chronic inflammation with anti-inflammatory therapy.

Prevention depends on the specific cause. Wearing protective eyewear during high-risk activities can reduce the chance of traumatic glaucoma. Using the lowest effective dose of steroids for the shortest possible duration, with regular pressure monitoring, helps prevent steroid-induced glaucoma. For patients with diabetes or vascular disease, keeping blood sugar and blood pressure well controlled lowers the risk of developing neovascular glaucoma. Routine comprehensive eye exams remain one of the most effective ways to catch rising pressure before permanent damage occurs.