Understanding Glaucoma.

Glaucoma is a group of eye diseases that cause progressive, irreversible damage to the optic nerve — the structure that transmits visual information from the eye to the brain. In most cases, this damage is associated with elevated pressure inside the eye. Because the disease typically starts by affecting peripheral (side) vision, most people are unaware they have it until significant damage has already occurred. It is one of the leading causes of permanent vision loss worldwide.

The eye continuously produces a clear fluid called aqueous humor that nourishes internal structures and maintains the eye’s shape. This fluid drains through a mesh-like channel called the trabecular meshwork. When this drainage system becomes less efficient — due to aging, structural changes, or other factors — fluid accumulates and intraocular pressure rises. Over time, elevated pressure can compress and damage the delicate nerve fibers of the optic nerve.

The main types include open-angle glaucoma (the most common, accounting for about 90% of cases), angle-closure glaucoma (where the iris physically blocks drainage), normal-tension glaucoma (optic nerve damage despite normal pressure readings), and secondary glaucoma (caused by another condition such as eye injury, inflammation, or long-term corticosteroid use). Each type requires a different management approach, which is why a thorough evaluation by a glaucoma specialist is essential.

Yes — this is one of the most important things to understand about glaucoma. Open-angle glaucoma, the most common form, develops slowly and painlessly with no noticeable symptoms in its early stages. By the time a person notices changes in their vision, up to 40% of optic nerve fibers may already be permanently damaged. This is why glaucoma is often called the “silent thief of sight” and why routine comprehensive eye exams are so critical for catching it early.

Several factors increase glaucoma risk: age over 60, African, Hispanic, or Asian descent, a family history of glaucoma, diabetes, high blood pressure, severe nearsightedness (high myopia), a history of eye injury, and long-term corticosteroid use. African Americans are 6 to 8 times more likely to develop glaucoma and tend to develop it at an earlier age. If you have one or more of these risk factors, annual comprehensive eye exams are strongly recommended.

Glaucoma itself cannot be prevented, but vision loss from glaucoma can be prevented or significantly slowed with early detection and treatment. The single most effective step you can take is scheduling regular comprehensive eye exams that include optic nerve evaluation and pressure measurement. Maintaining overall health through regular exercise, a balanced diet, and managing conditions like diabetes and high blood pressure may also support eye health.

Yes, significantly. Having a first-degree relative (parent or sibling) with glaucoma increases your risk by 4 to 9 times compared to the general population. Multiple genes have been identified that contribute to glaucoma susceptibility. If you have a family history, it is especially important to inform your ophthalmologist and begin regular screening earlier than the general population — ideally starting at age 40 or sooner if other risk factors are present.

The American Academy of Ophthalmology recommends a baseline comprehensive eye exam at age 40, with follow-up exams every 1 to 2 years. After age 65, annual exams are recommended for everyone. If you have risk factors — such as family history, African or Hispanic descent, diabetes, or high myopia — annual screening should begin earlier. A standard vision check or glasses prescription is not sufficient; a dilated exam with optic nerve evaluation is required to screen for glaucoma.

All glaucoma treatment focuses on one goal: lowering intraocular pressure to a safe level that prevents further optic nerve damage. Options include prescription eye drops, laser procedures such as SLT, minimally invasive glaucoma surgery (MIGS), and traditional filtering surgery for advanced cases. Your doctor will recommend a treatment approach based on the type and severity of your glaucoma, your overall health, and your lifestyle.

Glaucoma eye drops are the most common first-line treatment. They work by either reducing the amount of aqueous humor the eye produces or by improving the drainage of fluid from the eye, both of which lower intraocular pressure. Several classes of drops are available, and your doctor may prescribe one or more types depending on your target pressure. Consistency is essential — skipping doses can allow pressure to rise and put the optic nerve at risk.

Selective Laser Trabeculoplasty (SLT) is a gentle, in-office laser procedure that uses targeted light energy to stimulate the eye’s natural drainage system, improving fluid outflow and lowering pressure. The procedure is painless, takes only a few minutes, and can reduce or even eliminate the need for daily eye drops. SLT is increasingly used as a first-line treatment and can be repeated if needed.

Minimally Invasive Glaucoma Surgery (MIGS) refers to a group of micro-scale surgical procedures that lower eye pressure through tiny incisions with minimal trauma to the eye. MIGS is typically recommended for patients with mild to moderate glaucoma who need better pressure control than drops or laser alone can provide. Many MIGS procedures can be performed at the same time as cataract surgery, addressing both conditions in a single visit with faster recovery and fewer complications than traditional glaucoma surgery.

No — vision lost to glaucoma is permanent. Once optic nerve fibers are damaged, they cannot regenerate with current medical technology. This is why early detection is so critical. The goal of all glaucoma treatment is to preserve the vision you have by preventing further nerve damage. With timely diagnosis and consistent treatment, the vast majority of patients can maintain functional, useful vision throughout their lives.

Without treatment, glaucoma causes a slow, progressive loss of vision that begins in the periphery and gradually narrows until only a small central “tunnel” of vision remains. Eventually, total and permanent blindness can result. Glaucoma is the leading cause of irreversible blindness worldwide — but this outcome is largely preventable with early detection and proper management. Consistent follow-up with your ophthalmologist is essential to monitor the disease and adjust treatment as needed.

Yes, glaucoma usually affects both eyes, though it often progresses at different rates in each eye. One eye may have more advanced damage than the other, which can make the condition even harder to notice on your own — the brain compensates by relying more heavily on the healthier eye. This is another reason why regular comprehensive eye exams with optic nerve evaluation are important, as your doctor can detect asymmetric damage that you might not perceive in daily life.